890 ZOOLOGY INSECTS. 



diverging in the female, tricarinate, each about equally distinct, though not 

 prominent, yet forming sharply denned angles; the two sides (halves) of 

 the dorsum flat, but ascending slightly to the median carina; posterior 

 margin obtusely and regularly rounded; posterior sulcus behind the middle, 

 distant from the other two, all distinct but not profound. Posterior femora 

 of the female not reaching the tip of the abdomen, about eqiial to it in the 

 male. Elytra not extending beyond the middle of the second segment, 

 obovate, not meeting on the back; wings but mere figments. Sub-anal 

 plate of the male pointed (cerci and super-anal plate damaged); cerci of 

 the female broad, short; super-anal plate thick, oblong, and subsulcate. 

 Antenna? not extending beyond the tip of the pronotum. 



Color (after immersion in alcohol). 



Male. Brown, varied with yellowish. Eyes, top of the head, dorsum 

 of the pronotum, elytra, and abdomen brown; an irregular spot on the 

 upper portion of the side of the pronotum shining brown. Posterior 

 femora with the disk reddish-brown; upper and lower margins yellow; two 

 broad spots on the inner face dark, rest yellow, except the apex, which is 

 also black. The female has the general color, greenish yellow, but I am 

 inclined to think that usually this is darker, perhaps even brown; spot on 

 the side of the pronotum and disk of the femora reddish-brown. The 

 abdomen in both sexes keeled above. 



Length, $ , 0.75 inch; <* , 0.62 inch. Mountains of Southern Colorado. 



It is possible that the specimens I have marked as P. unicolor belong 

 to this species. 



Named in honor of Lieut, W. L. Marshall, U. S. A., who has made 

 valuable collections of Orthoptera. 



PEZOTETTIX HUMPHEEYSII, sp. nov. 



Belongs to Pesotettix proper of Burmeister as limited by Stal, and is 

 closely related to P. mendax, Fisch. 



Female. Large and fleshy; abdomen short and tapering rapidly, 

 scarcely reaching the tip of the posterior femora, Head large and convex 

 above; eyes large and approximate above; vertex somewhat broad and 

 expanding in front of the eyes, slightly channeled, usually a round pit or 



