10 A VENATION AL STUDY OF THE ZYGOPTERA 



Proto/ieuri/nae 



Lestoidi/sae 



Lestimae 



CoEMAGRIOniNAE, 



[Aegapodagrionimae 



PsEUDOSTIGMATI/iAE 



Epallaginae 



DlSPAROCYPHITSAE 



Agrionimae 



PoLYTIiORIMAE 



tPIOPHLEBIMAE 



Amisozygoptera 



Fig. C. Proposed Phylogenetic Tree for the Zygoptera. 



The Polythorlnae 



The most shari)ly differentiated group of the Agrionidae, in that 



it differs most from the others, is the Volythorinae. In it AI does 



not descend the arcuhis to any extent, so that the quadrangle is 



very much wider jiroximally than (list ally and is concave anteriorly. 



