GENERIC CLASSIFICATION" OF APHIDIDAE. 



PHYLOGENY OF THE APHIDIDAE. 



In many published classifications of the Aphididae those groups 

 which according to the writer's conception are the most specialized 

 have been placed as the most primitive. This is the case with those 





£t-/b sort arts'! f 



Cerate 6 A /cf/fi f 



Mor/n afih /<//a ' 



~7u //a- u/ay//za, 

 safA/S/Ka. J 7?eroC*mm/aa. 



7>f//ic/<zi'//zae 



Cerua-AA idii a, 



~Pe n fa Son /n a. 



fllact-oS/iA/na. 



~7i-a./7is/ia~- 



£~(t./a.cA /Z//ZCC' 

 Fig. 1.— Phylogeny of the hemipterous family Aphididae. 



insects forming in the present classification the Eriosomatinae and 

 the Hormaphidinae. 



A study of the anatomy and the biology of aphids makes it evident 

 that there are three main groups of living forms for which subfamily 



