124 THE UNIVERSITY SCIENCE BULLETIN. 



External genitalia: Female, last ventral segment twice as long as the 

 preceding, posterior margin truncate except for small median projection; 

 pygofers short, bearing a very few spines, much exceeded by the very 

 long ovipositor. Male, valve hidden by last ventral segment; plates to- 

 gether about half as wide as last ventral segment, sinuately narrowed 

 laterally to long, acute apices; pygofers together forming a triangle a 

 little wider than long, bearing a few long spines. 



Dist7nbutio7i: Occurs in western Kansas. Specimens have 

 been taken in Decatur and Greeley counties. 



Hosts: Doctor Ball gives Sporobolus cryvtandrus as the host. 



Genus Scaphoideus Uhl. 



Prof. Herbert Osbom states that the most important char- 

 acters of this genus are "the deeply sinuate occiput, the long 

 antennae, the large lorse, approximate to margin of cheeks 

 (except in sanctus group), the narrow vertex, the width and 

 length of which are usually about equal, and the recurved 

 nodal or costal veins. The clypeus is usually widened at tip, 

 and for the more typical members of the genus the outer ante- 

 apical cell is narrowed behind, becoming pointed, and, in some 

 species, stylate." 



Of the nine species keyed below, six have been taken and 

 the other three should occur in the state. 



KEY TO SPECIES * 



A; Lorae remote from the margin of the cheeks; common elytral pic- 

 ture cruciate; claval vein straight, meeting suture at acute angle. 



sanctiis. 



A A, Lorae contiguous to or merging with border of cheeks; elytral pic- 

 ture not cruciate, outer claval vein curved or hooked at the distal 

 end. 

 B. Postnodal cell scarcely widened distally. 



C. Nodal vein arising from discal cell, transverse orange 

 band on vertex and a black one just before. 



auronitens. 



CC. Nodal vein arising from anteapical cell. 



D. Vertex flat with transverse impressed line. 



JHCundiis. 



DD. Vertex convex, without impressed line. 



scalaris. 

 BB. Postnodal cell much widened distally. 



C. Outer claval not strongly hooked at distal end, cross 

 nervure to claval suture indistinct or wanting. 

 D. Outer claval sinuate, approaching inner near its 

 middle, marked with fuscous. prodiictus. 



DD. Outer claval nearly straight and parallel to inner, 

 curved at tip. intric at-ns. 



* Adapted from key by Professor Osborn, Ohio Nat., xi, p. 250, 1910. 



