LAWSON: KANSAS CICADELLID^. 207 



Form: Smaller than preceding species. Length, 7 to 8 mm. Head 

 slightly wider than pronotum ; vertex one-half longer on middle than next 

 the eye, two and one-half times as wide as long, disc depressed, margin 

 acute, obtusely angled apically. Pronotum transverse, twice as broad as 

 long, humeral margins a little longer than the lateral, posterior margin 

 emarginate, disc transversely wrinkled. Elytra moderately long and 

 bread, slightly flaring apically. 



Colo?-: Vertex, pronotum, and scutellum yellowish, elytra fulvous. 

 Vertex sparsely inscribed with light brown, pronotum with disc darker, 

 scutellum with two dark marginal spots and light spots between. Elytra 

 irrorate with dark brown, with whitish areas on base and at tip of claval 

 area, there appearing to be two dark transverse bands behind these, and 

 with a few dark spots on costal area. Face yellowish, irrorate with 

 brown. 



Extetnal genitulia: Female, last ventral segment twice as long as 

 preceding, lateral angles large and obtuse, posterior margin deeply 

 emarginate and sinuate on either side of a large median lobe which is 

 notched and slightly exceeds the lateral angles; pygofers rather long 

 and narrow, exceeded by ovipositor, distal half spiny. Male, valve broad 

 and triangular, longer than last ventral segment, apex obtuse; plates to- 

 gether forming a triangle almost as wide as long, submarginally spined 

 margins tapering regularly to subacute apices which greatly exceed the 

 short pygofers, margins pilose, especially basally. 



Distribution: Specimens of this species have been taken in 

 Pottawatomie, Riley and Clark counties. 



Hosts: Van Duzee gives Sagittaria and Polygonum as host 

 plants. It is found on low ground. 



Genus ACINOPTERUS Van D. 



In the members of this genus the head is narrower than the 

 pronotum and the vertex is nearly twice as long on the middle 

 as next the eye. The pronotum is rather short, the lateral 

 margins nearly as long as the humeral, and with the disc trans- 

 versely wrinkled. The scutellum is finely but very distinctly 

 granular. The moderately long elytra are very characteris- 

 tically narrowed apically, the nervures strong. 



The one species of the genus and one of its varieties have 

 been found in the state. 



Acinopterus acuminatus Van D. 



(PI. 14, figs. 3-4.) 



Acinopterus acuminatus Van D., Psyche, vi, p. 308, 1892. 

 Acinopterus acuminatus G. & B., Hemip. Colo., p. 94, 1895. 



Acinopterus acuminatus Van D., Bui. Buf. Soc. Nat. Sci., viii, No. 5, p. 69, 1907 ; ix, 

 p. 225, 1909. 



Acinopterus acuminatus Osb., Ohio Nat., ix, p. 466, 1909. 



