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Question
Asked 28 June 2015

Could someone help me decide the ideal no.of clusters from the pseudo t squared graph in SAS?

In SAS, I ran ACECLUS and Cluster procedure to analyze a data set of 16 morphometric characters of a bird.
I don't see any obvious errors. So, two notes:
1) Plot the data with scatterplots using the PROC CLUSTER output. See the example in the linked SAS help page. What do the data look like? Can you see distinct clusters in the data? 
2) Again, you need to do some exploratory data analysis. I notice you are using the Ward minimum-variance method for determining cluster distance. Note that this method is extremely sensitive to outliers; check your data for skew and outliers that may be driving the results.