1907.] NATURAL SCIENCES OF PHILADELPHIA. 467 



STUDIES IN NORTH AMERICAN FULG0RID5;. 

 BY E. P. VAN DUZEE. 



The following studies on the Fulgoridce refer solely to material from 

 the United States and Canada now in my collection or which has recently 

 passed through my hands. The most practical and useful work in 

 this family has been done by Dr. Stal, and even now we must go back 

 to the synoptical tables published in 1866 in \^olume IV of the Hcmip- 

 tera Africana for the determination of new or difficult generic forms. 

 The key to the subfamilies given below is intended only for the forms 

 known to inhabit the United States and Canada, and would be of little 

 use with the complicated Fulgorid faunas of the tropics, especially of 

 the Old World. Mr. G. W. Kirkaldy has recently^ given us a new 

 arrangement of these subfamilies that in some respects is probably 

 more in accord with the biological relationship of these closely related 

 groups, but my knowledge of the tropical Fulgoridse is much too 

 limited for me to attempt an adjustment of our genera to the groups 

 there laid down; so for the present I prefer to follow Stal's classifica- 

 tion as closely as possible. 



This paper is not at all monographic in its character, as I touch only 

 on genera and groups I have had occasion to study in working out 

 certain undetermined material in my collection. I have added a few 

 synoptical tables in the hope that they may assist students in locating 

 some of the new or little known forms. 



Key to the Subfamilies of the Fulgorid.e. 



Anal area of the wings reticulated, sides of the clypeus carinate. 



1,FULG0RIDA. 



Anal area of the wings rarely reticulated, clypeus in this case without 



lateral carinaj, 1. 



1. Posterior tibite armed with a movable spur, 11, DELPHACIDA. 

 — . Posterior tibiaj without a movable spur, 2. 



2. Clavus granulated; costa dilated, the costal membrane trans- 



versely venose, 8, FLATIDA, 



— . Clavus rarely granulated; costa in this case not dilated, . . 3. 



' Hawaiian Sugar Planters' Assoc, Ent. Bui. Xo. Ill, p. 91, 1907. 



