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To avoid confusion with another identically-named creek approximately 8 km north of Humbug,
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it will be referred to here as “Monguagon Ditch.” As plans are in place to unearth and perhaps slightly re-
route this waterway, it will also be clearer to call the current stream a “ditch” and the restored stream a
“creek.”
1
Baseline Inventory of Odonata at the Detroit River International Wildlife Refuge,
Humbug Marsh Unit
Final Report, Challenge Cost Share MOA #2007CCS-98
Julie A. Craves
Rouge River Bird Observatory
Environmental Interpretive Center
University of Michigan-Dearborn
Dearborn, MI 48128
This report summarizes a baseline inventory of Odonata (damselflies, suborder Zygoptera, and
dragonflies, suborder Anisoptera) at the Detroit River International Wildlife Refuge, Humbug
Marsh Unit, Trenton and Gibraltar, Wayne County, MI (hereafter referred to as “Humbug”).
Methods
In their paper recommending biodiversity inventories for invertebrates, Rohr et al. (2007) advise
that baseline data emphasize relative abundances. Accordingly, this inventory was designed to
summarize the Odonata taxa present at Humbug, including relative abundance, status (e.g.,
breeding resident), and habitats (Kremen et al. 1993, Hawking and New 2002).
The site was visited 14 times in 2007: 3 times each in June, July, and August; twice in September
for adults and once for larval sampling; and once in October for adults and once for larval
sampling. Adult surveys were only done on days with appropriate weather (mostly sunny, warm,
without high winds) (Schmidt 1985, Chovanec and Waringer 2001, Hornung and Rice 2003) and
at peak flight times (10:00 to 16:00) (Bried et al. 2007).
Adult surveys took place along three transects and in two areas searches. One east-west transect
was as parallel as possible to a man-made ditch known as Monguagon Creek , beginning where it
1
empties from an underground pipe, and extending approximately 525 m to the Detroit River
(Trenton Channel). A second transect ran north-south parallel to the Detroit River shoreline for
approximately 185 m. A third transect was 200 m through open upland habitat. These transects
were walked slowly by one or two people, with only one person serving as a counter (Bried et al.
2007).
Area searches were conducted at the viewing platform on the Detroit River, and at the
pumphouse on Handler Drain. These surveys consisted of one or two people counting all adult
odonates found in an approximately 20 x 20 m open area adjacent to the water, as well as adults
2
visible near shore over the water at each location. Following Hornung and Rice (2003), enough
time was spent on all surveys to adequately sample Odonata present, so the durations of the
surveys depended on the abundance of the odonates present (i.e., days with high numbers took
longer to survey). In the case of the area searches, which covered small areas, the duration was a
minimum of 20 min, and searching was stopped when no new species were recorded for at least
10 min.
A tally was kept of all adult odonates observed. The exception was for damselfly species once
the count exceeded 50 individuals on survey dates after which large numbers (>100) had already
been recorded, as these species would have already qualified for the highest abundance class (see
below). This allowed for more concentration on less-common species. In addition to presence
and abundance, the sex of individuals was noted if the species was dimorphic, as were the
number of teneral individuals (newly emerged, shiny wings, and/or lacking adult coloration), and
any breeding activity (pairs in tandem, ovipositing). Individuals were netted for identification if
necessary. Most were released, but voucher specimens were taken for species new to the site, if
they represented extreme dates, or if they had unusual morphology (see Appendix A).
At the end of the season, each species received an abundance score based on the survey date
with the largest number of individuals recorded (Chovanec and Waringer 2001). The scores are
based on Bried et al. (2007), with their last two abundance categories combined:
1 = 1 to 2 individuals observed
2 = 3 to 10
3 = 11 to 25
4 = 26 to 50
5 = 50 or more, or the single clearly numerically dominant species.
For ease of use, these were then given a corresponding relative abundance class similar to that
used by Chovanec and Waringer (2001), where
1 = Rare
2 = Uncommon
3 = Frequent
4 = Abundant
5 = Extremely abundant.
Larval sampling took place along the entire length of Monguagon Ditch, along the Detroit River
shoreline at the viewing platform and the shore opposite the north end of Humbug Island, and in
Handler Drain. A few rainwater puddles that had been present for > 4 weeks were also sampled.
Aquatic D-nets were used to sample mud and vegetation, and rocks and other debris were
overturned by hand and examined for larvae (Bright 1999). Net contents were sorted on-site in
sorting pans. Non-odonate organisms and Odonata nymphs too undeveloped to identify beyond
suborder were returned to the sampling site. Nymphs taken for later identification were chosen in
approximate proportion to the phenotypes observed in the entire sample. These were immediately
3
preserved in individual vials of alcohol. Representative taxa were taken as voucher specimens
(see Appendix B). All specimens have been deposited into the University of Michigan Museum
of Zoology, Insect Division, and have been catalogued by the Michigan Odonata Survey.
Results
Surveys for adult Odonata talled 4358 individuals (3341 damselflies and 1017 dragonflies) of 34
species (12 damselfly species in 2 families and 22 dragonfly species in 5 familes). In addition, 3
dragonfly species were recorded outside of the designated survey routes or times. Table 1
summarizes all adult species recorded.
Larval sampling did not yield large numbers or variety of Odonata nymphs (or other benthic
macroinvertebrates). Greater than 75% were damselfly larvae. Approximately half of the
Odonata nymphs were returned to the sampling sites because they were too undeveloped to
identify beyond suborder. Seventy-three individual nymphs of entire sample of between 160 and
200 individuals were taken for later identification under a microscope. Fifty-four were
damselflies (46 Coenagriidae, all of which were Enallagma species, 8 too young to identify; and
19 were dragonflies (5 Aeshnidae, 11 Libellulidae, 3 too young to identify). There were no
nymphs identified to species that had not been recorded as adults. Table 2 summarizes the larvae
sampled.
There was evidence of breeding for 18 species (8 damselflies and 10 dragonflies) (see Table 1).
While ovipositing or presence of nymphs does not necessarily indicate successful breeding (e.g.,
production of adults), it is highly likely that most of these species have self-sustaining
populations at Humbug.
Figure 1. Male Stylurus plagiatus, 28 July 2007, Detroit River International Wildlife Refuge, Humbug Marsh Unit.
Photo by Julie A. Craves.
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Table 1. Adult Odonata recorded at the Detroit River International Wildlife Refuge, Humbug
Marsh Unit, 2007.
Species Abundance
class1
Breeding
evidence2
Notes
SUBORDER ZYGOPTERA
FAMILY LESTIDAE
Lestes dryas, Emerald Spreadwing Rare More common in
previous (wetter) years.
Lestes rectagularis, Slender Spreadwing Uncommon More common in
previous (wetter) years.
FAMILY COENAGRIIDAE
Argia apicalis, Blue-fronted Dancer Uncommon Pairs Found only in areas
adjacent to Detroit
River.
Enallagma carunculatum, Tule Bluet Extremely
abundant
Ovipositing
Enallagma civile, Familiar Bluet Extremely
abundant
Larvae
Enallagma exsulans, Stream Bluet Extremely
abundant
Ovipositing
Enallagma geminatum, Skimming Bluet Extremely
abundant
Ovipositing Only found on Handler
Drain.
Enallagma signatum, Orange Bluet Abundant Ovipositing
Enallagma vesperum, Vesper Bluet Rare See Notable Species.
Ischnura posita, Fragile Forktail Frequent Pairs
Ischnura verticalis, Eastern Forktail Extremely
abundant
Ovipositing
Nehalennia irene, Sedge Sprite Rare See Notable Species.
Table 1, continued.
5
SUBORDER ANISOPTERA
FAMILY AESHNIDAE
Aeshna constricta, Lance-tipped Darner Rare Ovipositing Only observed
ovipositing in
Monguagon Ditch.
Aeshna umbrosa, Shadow Darner Uncommon Larvae Only observed
ovipositing in
Monguagon Ditch,
where larvae were also
found.
Anax junius, Common Green Darner Abundant Larvae
Anax longipes, Comet Darner Rare See Notable Species.
FAMILY GOMPHIDAE
Arigomphus villosipes, Unicorn Clubtail Rare Only observed at
Handler Drain.
Stylurus notatus, Elusive Clubtail Uncommon See Notable Species.
Stylurus plagiatus, Russet-tipped
Clubtail
Abundant Pairs See Notable Species.
FAMILY MACROMIIDAE
Macromia taeniolata, Royal River
Cruiser
Rare See Notable Species.
FAMILY CORDULIIDAE
Epitheca cynosura, Common Baskettail Rare Abundance not
representative due to
lack of early-season
surveys.
Epitheca princeps, Prince Baskettail Uncommon
FAMILY LIBELLULIIDAE
Celithemis eponina, Halloween Pennant Rare
Erythrodiplax umbrata, Band-winged
Dragonlet
Rare See Notable Species.
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Erythemis simplicicollis, Common
Pondhawk
Frequent Larvae Males nearly always at
water, females more
common in upland
areas.
Libellula luctuosa, Widow Skimmer Rare
Libellula lydia, Common Whitetail Uncommon Larvae Abundance may not be
representative due to
lack of early-season
surveys.
Libellula pulchella, Twelve-spotted
Skimmer
Uncommon Abundance may not be
representative due to
lack of early-season
surveys.
Libellula vibrans, Great Blue Skimmer Rare See Notable Species.
Pachydiplax longipennis, Blue Dasher Abundant Ovipositing
Pantala flavescens, Wandering Glider Abundant Larvae
Pantala hymenaea, Spot-winged Glider Uncommon
Perithemis tenera, Eastern Amberwing Uncommon Ovipositing
Sympetrum rubicundulum, Ruby
Meadowhawk
Rare More common in
previous (wetter) years.
Sympetrum vicinum, Autumn
Meadowhawk
Uncommon Found to be more
common in previous
(wetter) years.
Tramea carolina, Carolina Saddlebags Rare
Tramea lacerata, Black Saddlebags Abundant Ovipositing
Based on the survey date with the largest number of individuals recorded.
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Strongest breeding evidence recorded, where rank order of strongest to weakest is: larvae found, ovipositing, pairs
2
in tandem, and teneral individuals. The latter two categories could include individuals that did not actually breed on
the site. Egg deposition or presence of larvae does not necessarily indicate successful breeding (e.g., production of
adults).
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Table 2. Larval Odonata recorded at the Detroit River International Wildlife Refuge, Humbug
Marsh Unit, 2007.
Location Genus/species N
Detroit River Enallagma sp. 26 3 likely E. signatum
Unknown Zygoptera 8 too undeveloped to identify
Libellula sp. 2 Possibly Erythemis simplicicollis
Unknown Anisoptera 3 too undeveloped to identify
Monguagon Ditch Enallagma civile 3
Enallagma sp. 13 Likely include several E. basidens
Aeshna umbrosa 2
Anax junius 3
Libellula lydia 4
Libellula lydia or
pulchella
1
Handler Drain Enallagma civile 1
Enallagma sp. 1
Erythemis
simplicicollis
1
Former Chrysler
property
Enallagma civile 2
Pantala flavescens 3
Notable Species
Enallagma vesperum, Vesper Bluet – One found in shrubs adjacent to the mouth of Monguagon
Ditch, 22 September. First for this site, and also only the second location for this species in
Wayne County.
Nehalennia irene, Sedge Sprite – Female on 17 June in tall grass along Monguagon transect was
the first for this location.
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Anax longipes, Comet Darner – A female taken on 17 June along the Detroit River transect is the
first adult voucher specimen for the county, and first female adult specimen for the state. Males
were recorded on 18 and 26 August. In 2005, there were two sightings at Humbug near Handler
Drain.
Stylurus notatus, Elusive Clubtail (Figure 2) – Three adults (two males, one female) were found
along the Detroit River transect on 29 September. These tend to perch high in trees (Dunkle
2000), and another observation on 6 October in a tree may have been this species.The first adult
voucher specimen for the state was taken in virtually the same location on 9 September 2006.
This is a species of special concern in Michigan, and is also listed as a species of greatest
conservation need in Michigan’s Wildlife Action Plan (Eagle et al. 2005). In Ontario, it is listed
as uncommon in Essex County (Pratt 2007) and the only records for Lambton and Kent counties
occurred prior to 1984 (OOA 2005). It is considered uncommon and limited in Ohio where most
records are from the southern tier of counties (Glotzhober and McShaffrey 2002).
Figure 2. Male Stylurus notatus, 29 September 2007, Detroit River International Wildlife Refuge, Humbug Marsh
Unit. Photo by Julie A. Craves.
Stylurus plagiatus, Russet-tipped Clubtail (Figure 1) – A total of 121 individuals were recorded.
Nearly all were on the Monguagon transect (with most on the portion adjacent to the east-west
section of the shoreline of the Detroit River, opposite the north end of Humbug Island) and the
Detroit River transect. The majority were found perched in the shrubs closest to the open fields
of the former Chrysler property.
The daily maximum was 68 on 18 August, which included 15 seen off the designated transects
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(flushed from the fields on the former Chrysler property). Since they allowed close approach
before flushing, counts were likely quite a small fraction of the total number of individuals
present. Further, the obstructed view of the Detroit River prevented any observation of patrolling
males, which often spend much of the day over water (Dunkle 2000).
Several deformed individuals were observed, all females: one with a bent abdomen on 8 August,
and two with deformed wing tips, on 8 and 28 August.
This is a species of special concern in Michigan, and is also listed as a species of greatest
conservation need in Michigan’s Wildlife Action Plan (Eagle et al. 2005). The only record for
Canada was a male taken on Pelee Island, Essex Co., on 19 July 1924 (P. Pratt, pers. comm.,
OOA 2005). It is considered uncommon and restricted in Ohio with few recent records
(Glotzhober and McShaffrey 2002).
Macromia taeniolata, Royal River Cruiser – A male on 26 August along the Detroit River (in the
far north corner, not during a transect count) was the first for this site.
Erythrodiplax umbrata, Band-winged Dragonlet (Figure 3) – Two males on 6 October in a
temporary puddle on the former Chrysler property, close to Jefferson Avenue, were the first for
this genus in Michigan. This southern species, most common in Texas and Florida (see Figure 4),
had also been observed in Ohio in late summer 2007. The Humbug location is the furthest north
this species has ever been recorded (~40 km further north than the northernmost Ohio
observation), and over 200 km farther north than the previous northernmost specimen, taken in
southern Ohio in 1934 (Borror 1935, Craves, in prep.).
Figure 3. Male Erythrodiplax umbrata, 6 October 2007, Detroit River International Wildlife Refuge, Humbug Marsh
Unit. Photo by Julie A. Craves.
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Figure 4. Distribution of pre-2006 records of Erythrodiplax umbrata, from Donnelly (2004).
Libellula vibrans, Great Blue Skimmer – A male seen perched along the wood-chipped path near
the gate to Jefferson Avenue on 26 August was the first for this site. This species was first
vouchered for the state in 2005 (Craves 2006), but was found at many new locations in the
county in 2007.
Discussion and recommendations
As noted in Table 1, some species were certainly (Epitheca cynosura, Common Baskettail) or
probably (Libellula lydia, Common Whitetail; Libellula pulchella, Twelve-spotted Skimmer)
undercounted because surveys did not begin until mid-June. There are several other unrecorded
species that also peak early in the season, such as Epitheca costalis (Slender [Stripe-winged]
Baskettail), Leucorrhinia intacta (Dot-tailed Whiteface), the pond clubtails Gomphus lividus
(Ashy Clubtail), Gomphus fraternus (Midland Clubtail), and Gomphus graslinellus (Pronghorn
Clubtail), and the darner Basiaeschna janata (Springtime Darner) that could potentially be found
at Humbug.
Several species of damselflies as well as the meadowhawks (Sympetrum sp.) were recorded in
lower numbers than might be expected during a summer with more normal rainfall. Not only do
these species tend to breed in shallow or temporary ponds, but so does much of their prey. With
rainfall below normal from April through August (Deedler 2007a and 2007b), dry conditions
may account for lower than expected numbers of some species at Humbug in 2007. Also unusual
were the unseasonably warm temperatures in late March (with several days >26°C) followed by a
prolonged period of below-normal temperatures (Deedler 2007a). The impact on Odonata is
unknown, but the heat could have accelerated emergence of some species, which would have
then perished in the subsequent cold weather.
It is, therefore, recommended that at least one more year of surveys be completed that span the
period from May through early October to help offset the unusual weather conditions of 2007,
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and provide a more complete picture of the taxa present over the entire flight season.
Having complete baseline data is particularly important considering the habitat restoration
planned for this site. Baseline data will help guide restoration efforts. Follow-up inventories will
aid in assessing the success of restoration projects, and be especially valuable because of the
usefulness of Odonata as indicators of ecosystem health – not only aquatic environments, but
also aquatic/terrestrial transition zones and upland communities (Chovanec and Waringer 2001,
Hornung and Rice 2003).
The presence of such a substantial population of the state special concern Stylurus plagiatus is
very noteworthy. This is the largest documented population of this species in the region.
Michigan’s Wildlife Action Plan (Eagle et al. 2005), in which S. plagiatus is listed as a species
of greatest conservation need, states that the distribution, population status, and threats to this
species need to be determined. S. plagiatus inhabits primarily rivers, typically with silty sand
bottoms (Dunkle 2000, Glotzhober and McShaffrey 2002).
Very little has been written about the habits of this species. At the only other location where a
population has been found in southern Michigan, along the Huron River in the Willow and
Lower Huron Metroparks (Craves 2002, unpublished data), the habitat characteristics are
remarkably similar to that observed at Humbug. Both sites feature slow, fairly shallow sections
of silty or sandy-bottomed large rivers, at least one shoreline that is lined with a 20 to 30 m wide
strip of vegetation comprised of tall trees immediately adjacent to the river, bordered by dense
shrubs which face an open, weedy field. These features apparently provide the necessary
breeding habitat, and preferred habitat for mate-finding, roosting, and foraging for this species. If
this unique combination of characteristics proves to be strictly required by S. plagiatus, then this
habitat is probably quite limited in the region, making Humbug a critically important site for this
species.
More study on the habitat association of S. plagiatus at Humbug and on other properties on the
Lower Detroit River within the Refuge boundaries in highly merited. It is further recommended
that the current configuration of the shoreline vegetation in areas where S. plagiatus were
concentrated be preserved. This should include portions of the former Chrysler property, up to a
minimum of 0.5 km from the shoreline (NatureServe 2007).
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Literature Cited
Borror, D. J. 1935. New records of Ohio dragonflies (Odonata). Ohio Jrl. Science. 35:457-456.
Bried, J. T., B. D. Herman, and G. N. Ervin. 2007. Umbrella potential of plants and dragonflies
for wetland conservation: a quantitative case study using the umbrella index. Jrl. Applied
Ecology 44:833-842.
Bright, E. 1999. Sampling protocol for Odonata larvae. Michigan Odonata Survey Tech. Note
No. 2. June 1999. 5 pp.
Chovanec, A. and J. Waringer. 2001. Ecological integrity of river-floodplain systems –
assessment by dragonfly surveys (Insecta: Odonata). Regulated Rivers: Research and Mgmt. 17:
593-507.
Craves, J. A. 2002. A preliminary list of the Odonata of Wayne Co. Michigan Birds and Natural
History 9:7-16.
Craves, J. A. 2006. First Michigan specimens of Libellula vibrans Fabricius (Odonata:
Libellulidae). Great Lakes Entomologist 39: 91-93.
Craves, J. A. In prep. Erythrodiplax umbrata (Linneaus) (Odonata: Libellulidae): New for
Michigan.
Donnelly, T. W. 2004. Distribution of North American Odonata Part II: Macromiidae,
Corduliidae, and Libellulidae. Bulletin of American Odonatology 8:1-32.
Dunkle, S. W. 2000. Dragonflies Through Binoculars. Oxford Univ. Press, New York, NY.
Deedler, B. 2007a. Spring frequently teased us and displeased us in 2007. Climate archives,
National Weather Service Weather Forecast Office, Detroit/Pontiac, MI. National Oceanic and
Atmospheric Administration.
<http://www.crh.noaa.gov/crnews/display_story.php?wfo=dtx&storyid=8693>. Accessed 29 Nov
2007.
Deedler, B. 2007b. Summer of 2007 review. Climate archives, National Weather Service
Weather Forecast Office, Detroit/Pontiac, MI. National Oceanic and Atmospheric
Administration. <http://www.crh.noaa.gov/images/dtx/climate/sum07review.pdf>. Accessed 29
Nov 2007.
Eagle, A. C., E. M. Hay-Chmielewski, K. T. Cleveland, A. L. Derosier, M. E. Herbert, and R. A.
Rustem, eds. 2005. Michigan's Wildlife Action Plan. Michigan Dept. Natural Resources.
Lansing, MI..<http://www.michigan.gov/dnrwildlifeactionplan>. Accessed 28 Nov 2007.
13
Glotzhober, R.C. and D. McShaffrey, eds. 2002. The Dragonflies and Damselflies of Ohio. Ohio
Biological Survey Bulleting New Series Vol. 14, No. 2.
Hawking, J. H. and T. R. New. 2002. Interpreting dragonfly diversity to aid in conservation
assessment: lessons from the Odonata assemblage at Middle Creek, north-eastern Victoria,
Australia. Jrl. Insect Conservation 6:171-178.
Hornung, J. P. and C. L. Rice. 2003. Odonata and wetland quality in southern Alberta, Canada:
a preliminary study. Odonatologica 32:119-129.
Kremen, C., R. K. Colwell, T. L. Erwin, D. D. Murphy, R. F. Noss, and M. A. Sanjayan. 1993.
Terrestrial arthropod assemblages: their use in conservation planning. Conservation Biology
7:796-808.
NatureServe. 2007. Stylurus plagiatus species account. NatureServe Explorer: An online
encyclopedia of life. NatureServe, Arlington, VA. < http://www.natureserve.org/explorer> Ver.
6.3. Accessed 29 Nov 2007.
[OOA] Ontario Odonata Atlas. 2005. Natural Heritage Information Centre, Ontario Ministry of
Natural Resources. <http://www.mnr.gov.on.ca/MNR/nhic/odonates/ohs.html> Ver. 15-02-2005.
Accessed 29 Nov 2007.
Pratt, P. D. 2007. Odonata of Essex County, Ontario. Ojibway Nature Centre Home Page. Dept.
of Parks and Recreation, Windsor, Ontario. <http://www.ojibway.ca/swodonat.htm>. Ver.
JUNE2007. Accessed 29 Nov 2007.
Rohr, J. R., C. G. Mahan, and K. C. Kim. 2007. Developing a monitoring program for
invertebrates: guidelines and a case study. Conservation Biology 21:422-433.
Schmidt, E. 1985. Habitat inventarization, characterization, and bioindication by a
“representative spectrum of odonata species (RSO).” Odonatologica 14: 127-133.
~
Please cite this document as:
Craves, J. A. 2007. Baseline inventory of Odonata at the Detroit River International Wildlife Refuge,
Humbug Marsh Unit. Final Report. CCS MOA #2007CCS-98. USFWS Region 3, Fort Snelling, MN.
14
Appendix A. Adult voucher specimens taken at the Detroit River International Wildlife Refuge, Humbug
Marsh Unit, 2007. Specimens have been deposited into the University of Michigan Museum of Zoology,
Insect Division, and have been catalogued by the Michigan Odonata Survey.
Species Date Reason
Lestes dryas, Emerald Spreadwing 17 Jun 2007 female with bent abdomen
Enallagma carunculatum, Tule Bluet 6 Oct 2007 new late specimen date for
southeast MI
Enallagma signatum, Orange Bluet 29 Sep 2007 new late specimen date for
southeast MI
Enallagma vesperum, Vesper Bluet 29 Sep 2007 first sighting and voucher for site,
new late specimen date for MI
Ischnura verticalis, Eastern Forktail 28 Jul 2007 rare andromorphic female
Nehalennia irene, Sedge Sprite 17 Jun 2007 first sighting and voucher for site
Aeshna constricta, Lance-tipped Darner 15 Jul 2007 first voucher for site
Aeshna umbrosa, Shadow Darner 15 Jul 2007 new early specimen date for
county
Anax longipes, Comet Darner 17 Jun 2007 first county record, first voucher
for site
Stylurus notatus, Elusive Clubtail 29 Sep 2007 new late specimen date for MI
Stylurus plagiatus, Russet-tipped Clubtail 15 Jul 2007 new early specimen date for MI
8 Sep 2007 new late specimen date for MI
Macromia taeniolata, Royal River Cruiser 26 Aug 2007 first sighting and voucher for site
Epitheca princeps, Prince Baskettail 24 Jun 2007 first voucher for site
Celithemis eponina, Halloween Pennant 18 Aug 2007 first sighting and voucher for site
Erythrodiplax umbrata, Band-winged
Meadowhawk
6 Oct 2007 new state record
Erythemis simplicicollis, Common Pondhawk 29 Sep 2007 new late specimen date for
southeast MI
Pantala flavescens, Wandering Glider 13 Oct 2007 new late specimen date for county
Pantala hymenaea, Spot-winged Glider 29 Sep 2007 new late specimen date for MI
Sympetrum rubicundulum, Ruby Meadowhawk 29 Sep 2007 new late specimen date for
southeast MI
15
Appendix B. Larval voucher specimens taken at the Detroit River International Wildlife Refuge,
Humbug Marsh Unit, 2007. Specimens have been deposited into the University of Michigan
Museum of Zoology, Insect Division, and have been catalogued by the Michigan Odonata
Survey.
Species Date
Enallagma sp. 22 Sep 2007
Enallagma civile, Familiar Bluet 13 Oct 2007
Aeshna umbrosa, Shadow Darner 22 Sep 2007
Anax junius, Common Green Darner 22 Sep 2007
Erythemis simplicicollis, Common Pondhawk 22 Sep 2007
Libellula lydia or pulchella, Common Whitetail or Twelve-spotted
Skimmer
22 Sep 2007
Libellula lydia, Common Whitetail 22 Sep 2007
Pantala flavescens, Wandering Glider 13 Oct 2007
