GEOLOGICAL SURVEY OF THE TEEEITOEIES. 449 



ealoptenoid in general appearance. Vertex regularly hexagonal, stand- 

 ing out in tlie form of a short truncated cone, the tip depressed in the 

 center ; face slightly oblique, straight, quadricarinate •, cariuse nearly 

 parallel, middle pair approach each other immediately below the ocellus. 

 Eyes elongate, oblique, straight in front. Pronotum scarcely enlarged 

 behind; rtuterior lobes reticulately, and x)osterior lobe longitudinally, 

 rugulose ; median carina very distinct, but not elevated. Elytra and 

 ■wings narrow, rather shorter than the abdomen. Valves of the ovipos 

 itor prominent, the low^er pair much slenderer than the upper aud much 

 exserted. Male cerci slender, tapering and curved upward; subanal 

 lilate narrow, tapering, subtruncate at the apex, entire. Prosternal spine 

 subquadrate, i)ointed, and straight. Antennse passing the pronotum 

 slightly. Posterior femora passing the abdomen. 



Color, (dried after immersion in alcohol). — Nearly uniform greenish- 

 yellow. Face and pronotum sprinkled with dusky dots. The elevated 

 lines of the pronotum pale yellow ; depressed portions in the alcoholic 

 specimens testaceous-green, but in the living insect may be and proba- 

 bly are colored quite differently ; some specimens have the middle carina 

 and other portions of the pronotum tinged with red. Posterior femora 

 pale reddish along the upper edge. Elytra a transparent green ; wings 

 pellucid. 



Dimensions. — 9 , length, 1.06 inch.; elytra, .G3 inch.: posterior femora, 

 .72 inch. ; posterior tibise, .66 inch. $ , length, .82 inch.; elytra, .5 inch. 



Kansas, (from C. R. Dodge's collection.) 



There is a possibility that this is synonymous with Pezotettix speciosa, 

 'Scudd., (Hayden's U. S. Geol. Surv. Neb., 250,) with which it agrees 

 tolerably well except in the length of the elytra and wings ; but Mr. 

 Scudder may have had the pupae, and he places it in Pezotettix provis- 

 ionally, " as it does not strictly appertain" to that genus. It is a some- 

 what anomalous species, but I think my specimens belong to Acridium. 



A. emarginatum, XJhl., (Scudd., Notes on Orthop., Geol. Surv. Neb.) 



This species is closely allied to and much like A. alutaceum, Harr. It 

 is the same one which I, in my former report, referred to A. flavo-facia- 

 tum, DeG. It has been Ibund in Southeastern Colorado and in Nebraska, 

 but appears to be rarely met with. 



Caloptenus, Burm. 



The following table of the species belonging to the United States will 

 give the distinguishing characters of the new species herein described : 



jN.. Elytra without spots : 



a. A broad yellow stripe along each lateral angle hivittatus. 



aa. With but one or no dorsal stripe : 



b. General color green, a yellow dorsal stripe * viridis. 



1)1). Dorsum not striped : 



c. Elytra a little longer than the abdomen; size, 



large differentialis. 



CG. Elytra much shorter than the abdomen ; size, 



small * Bodgei. 



AA. Elytra with spots : 



a. Elytra longer than the abdomen. 



1). Elytra much longer than the abdomen ; last ventral segment 



of the male notched at the tip sj^retus. 



29 GS 



