Nine little known or ncw species of ihecyanoprokaryoüc genus CAroococcicv from tropical regions are prescntcd.Twoof them. Oí. /Jíj/vfdn/owiis Schmidle 1902 and Oí. ífií/Ji/íifiensis(Woloszyñska 1912) Gcíller 1925, were described as carly as in the first decades of this ceniury, but ignored by latcr authors, probabiy owing lo Ibc auiborliy of Geitler who oniitlcd thcsc laxa in bis world monograpb from 1932. Bolb ihesc species occur in tropical frcshwaier bioiopes over the world and were rcpealedly published undcr diffcrcnt incorrect ñames. Reccntly, ibcy were found in Central American localities. Fivc species, differing sligbtly from the known and described laxa, were found from the metaphyton of stagnant watcrs in Cuba and in the coastal áreas of Mexican Gulf in México (Papaloapan basin); ibcir variabilily and morphology are discusscd. One new species, Ch. deltoides, is described, Two planktic species (from the subg. Limriococcus) are described from large Africaii iakes. Ch. catenatus from L. Edward (E Africa) and Oí. cronitergae from the Kariba rescrvoir.