36 



THE UNIVERSITY SCIENCE BULLETIN. 



Diagrammatically this phylogenetic relationship would be ex- 

 pressed as follows: 



FULGORIDAE 



CERCOPiDAE 



CICADELLIDAE 



MEMBRACIDAE 



CICADiDAE 



When we consider the relationships of the different sub- 

 families of the Cicadellidx we again find opportunity for 

 differences of opinion. Van Duzee in his catalogue arranges 

 them in the following order, beginning with the lowest: 



Paropinse. 



Bythoscophne. 



Cicadellinse. 



Gyponinse. 



Jassinss. 



Dr. F. A. Fenton in his paper on the parasites of leaf hop- 

 pers gives the following phylogenetic tree for these sub- 

 families : 



TYPHLOCYBINAE 



GYPO^INAE 



CICADELJilNAE 

 BYTHOSC(^;fNAE "^ ^/^ 



PAR OP 



