LAWSON: KANSAS CICADELLWJE. 77 



External genitalia: Female, last ventral segment sinuately produced 

 medially and with small median notch; pygofers short and broad, widest 

 at beginning of distal half and then tapering suddenly, slightly exceeded 

 by ovipositor. Male, last ventral segment long, posterior margin trun- 

 cate; plates long and narrow, about equal to the long narrow pygofers. 



Internal male genitalia: Styles with anterior portion distinctly club- 

 like, fastened to connective at middle of club, terminal portion long, 

 slender at base, and gradually thickened to broad and plump tip, this 

 terminal portion slightly curved; connective with three basal processes, 

 the median one long, upper part slender and widening at tip attached to 

 oedagus; oedagus, viewed dorsally, club-like, with a broad, heavy base and 

 tip somewhat bifid, fastened at about its middle to a very characteristic 

 broadly U-shapved structure with the tips of the arms directed strongly 

 caudad ; imbedded in the side of the pygofers. at their caudal end, are two 

 small, pointed chitincus bars, one much smaller than the other. 



Distribution: Reported only from Douglas and Pottawato- 

 mie counties. Probably occurs wherever its host is. found. 

 Hosts: Taken abundantly on walnut. 



Subfamily CICADELLIN^ Van D. 



This subfamily and the Gyponinse are at once distinguished 

 from all other members of the Cicadellidx by having the ocelli 

 situated above the margin, on the disc of the vertex. The mem- 

 bers of the CicadelUnx, however, are cylindrical and elongate 

 in form, as distinguished from the robust and flattened 

 Gyponinse. 



Seven genera of this subfamily occur in Kansas. 



KEY TO GENERA.* 



A. Antennal sockets usually overhung by a distinct ledge which pro- 

 jects beyond curve of head, anterior tibise sulcate above or dilated at 

 the extremity. Elytra narrow, not covering lateral margins of ab- 

 dominal terga. 



B. Thorax roundingly six-angular, posterior margin rounding, 

 with a slight median excavation. Vertex longitudinally fur- 

 rowed. Claval veins distant. Aidacizes. 

 BB. Thorax four-angular, posterior margin broadly emarginate. 

 anterior and posterior margins nearly parallel.' Clavaf veins 

 often united in the middle or approaching and tied by a cross 

 nervure. 



C. Vertex triangular, longer than basal width, side mar- 

 gins nearly straight; face as seen from side nearly 

 straight. Homalodisca. 



CC. Vertex obtusely rounding, shorter than, or as long as 

 basal width; face as seen from side, roimdingly 

 angled. Oncomet^pia. 



* Adapted from key by Prof. E. D. Ball, Proc. la. Acad. Sci., viii, p. 38, 1901. 



