130 Kansas Academy of Science. 



and other favors have been of assistance, the author desires to ex- 

 press his hearty thanks. 



Several terms used in the keys may require explanation. The 

 term vertex is loosely applied to all the head, exclusive of the eyes^ 

 which is visible from directly above. The width is measured at 

 the narrowest point between the eyes. The part extending back 

 of the eyes is not considered in discussing the shape of the vertex. 

 The face, likewise, includes all of the head, exclusive of the eyes, 

 which is visible from directly below. The clypeus is said to be 

 expanded at the apex when it is broader at or near the apex than 

 at some point nearer the clypeal suture. Other details are given 

 in plate I. 



Many species, especially in the Jassidse and Acocephalidse, ore 

 sexually dimorphic, and occur frequently in both short- and long- 

 winged forms. 



FAMILIES OF JASSOIDEA. 



A. Ocelli on face below anterior margin of vertex. 



B. With a broad, thin margin between vertex and front Kcebelid^' 



BB. Without a broad, thin margin between vertex and front. Front less than three 

 times as long as its width between the antennse. Lorae usually enclosed below 

 by the margin of the cheek. 



C. Vertex and front distinctly limited ParofiDjE 



CO. Vertex and front not distinctly limited, but rounding into each other. 

 Ocelli exposed on the face in very slight impressions or none. 



Bythoscopid*; 

 AA. Ocelli on the vertex. 



B. Ocelli rarely nearer anterior margin of vertex than posterior. Inner margin of 

 eye not depressed below the vertex bordering it. Lateral carina of pronotum 

 not below center of eye (except in Bathysmatophorus) . Ocelli prominent. 



C. Form narrow, cylindrical. Profile of face and vertex rounded or obtuse 

 Vertex usually bright colored or bearing curved or branching lines. 



Tettigoniellid^ 



CC. Form depressed, broader. Profile of face and vertex acute, or the face 

 impressed immediately beneath the vertex, producing a more or less 

 rounding or overhanging ledge (except in BathysTnat'^phortis) . Vertex 

 rarely bright colored, and marked, if at all, with a few straight longitu- 

 dinal stripes Gyponid^ 



BB. Ocelli very near anterior margin of vertex ; much nearer anterior margin than 

 posterior.® Inner margin of eye depressed distinctly below the vertex bordering 

 it. Lateral carina of pronotum below center of the eye; usually abruptly descend, 

 ing back of eye. Ocelli often indistinct JASSID.E 



AAA. Ocelli on or very near anterior margin of vertex, or wanting.© 



B. Elytra often subcoriaceous. usually angulated at tip of clavus ; clavus acute, 

 subacute or blunt, never attenuately pointed (plate I, fig. 7). Ocelli rarely ab- 

 sent although often hard to distinguish Acocephalid^ 



BB. Elytra membranous, not angulated at tip of clavus; clavus attenuately pointed 

 (plate 1, fig. 5); elytra always much longer than the abdomen. Ocelli rarely 

 present Typhlocybid^ (Plate I, fig. 6.) 



1. In such genera of Acocephalidse (Stronglylocephalus and Acocephalus) as might be con- 

 fused with Jassidae because of the position of the ocelli, which are placed superiorly very near 

 the anterior margin of the vertex, there is a strong, narrow emargipation of the eye next the 

 entennse. This is not found in the preceding groups. 



