36 



THE UNIVERSITY SCIENCE BULLETIN. 



Diagrammatically this phylogenetic relationship would be ex- 

 pressed as follows: 



FULGORIDAE 



CERCOPIDAE 



CICADELLIOAE 



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: 



Paro'pinae. 



Bythoscopinas. 



Cicadellinse. 



Gyponiyise. 



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 



JASSJNAE 



GYPOjIINAE 



CICAOELLINAE 



PAROP. 



