158 



Prosternal spine stout, straight or slightly bent backward, obtuse ; pectus 

 broad as the head. Legs of but moderate length ; the posterior femora con- 

 siderably swollen next the base ; the disk convex. The male abdomen much 

 swollen at the apex, which is turned up; the cerci long, flat, moderately broad, 

 curved upward, and bent more or less over on the top. 



The group to which this genus and the preceding two belong needs 

 revision, but I have not the materials to do this properly. Some of the spe- 

 cies of this genus are given as distinct with, considerable doubt. 



Synoptical table of the species. 



A. Elytra unspotted, as long as the abdomen : 



a. A broad yellow stripe each side bivittatus. 



aa. Without stripes differcntialls. 



AA. Elytra wit'.i spots more or less distinct : 



a. Elytra longer than the abdomen : 



h. Elytra much longer than the abdomen; last ventral segment of 



the male notched at the tip spretus. 



bb. Elytra a little longer than the abdomen ; last ventral segment 

 of the male entire at the tip : 



c. Spots of elytra small and confined to median line along the disk, femur-rubrum. 



cc. Spots somewhat larger, and equally distributed over the elytra, griseus. 



aa. Elytra about as long as the abdomen : 



b. General color pale-yellow : 



c. Hind femora with two oblique streaks outside. - . biUturatus. 



cc. Hind femora with three black patches outside - - scriptus. 



bb. General color other than pale-yellow : 



c. Hind femora with three straight black bauds ; lower valves of 



the ovipositor nearly straight at the apex ptcnctulatus. 



cc. Hind femora with oblique brown bands ; lower valves of the 



ovipositor bent at the apex occidentalis. 



aaa. Elytra shorter than the abdomen : 



b. A pale stripe along each angle of the pronotum ; color pale olive- 

 green, spots indistinct iurnbtdlii. 



bb. Head and thorax with two broad, black stripes ; color tawny. . rcpletus. 



C. tKi-ufosaMai, Thos., Hayden's Geol. Surv. Terr., 1871, 452. 



Pale olive-green, with a white stripe along each side of the dorsum. 

 Elytra and wings shorter than the abdomen. 



Closely allied to Ommatolampis viridis, Th-os. Vertex with a broad, 

 shallow sulcus, into which a minute carina (not always apparent) enters from 

 the rear; frontal costa flat, shghtly depressed at the ocellus. Sides of the 

 pronotum shghtly divergent on the posterior lobe ; lateral carinse obtuse, 

 somewhat more distinct than in viridis. Elytra and wings a little shorter 



