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These Tetragoneuria/Epitheca Baskettails were photographed in my yard on Lake Worth, near Fort Worth, Tarrant County, Texas:; they should be either Mantled semiaquea or Common cynosura; To my eye there are differences in the abdomen shape and the structure of the cerci, so I suspect that A) is semiaquea and B) is cynosura - I'd appreciate feedback on this thorny ID issue:

A) late March 2004:

B) early May, 2004:

Here's a comparison of the cerci:- there seem to be three segments to the cerci; B has the distal segments longer than on A; on B the first segments narrow slightly while the 2nd segments widen slightly - on A the first two segments seem to be almost parallel: