36 



THE UNIVERSITY SCIENCE BULLETIN. 



Diagrammatically this phylogenetic relationship would be ex- 

 pressed as follows: 



FULGORIDAE 



CERCOPIDAE 



CICADELLIDAC 



MEMBRACIDAE 



I CAD I DAE 



When we consider the relationships of the different sub- 

 families of the Cicadellidas we again find opportunity for 

 differences of opinion. Van Duzee in his catalogue arranges 

 them in the following order, beginning with the lowest : 



Paropinse. 



Bythoscopinse. 



Cicadellinse. 



Gyponinse. 



Jassinse. 



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

 pers gives the following phylogenetic tree for these sub- 

 families : 



TYPHLOCYBINAE 



6Y POP WAI 



CICADELUNAE 



BYTHOSCQJWNAE 

 PAROPJNAE 



