56 NEW NORTH AMERICAN ACRIDID.E — BRUNER. 



Eritettix gen. uov. 



Related to the genera Oxycoryphiis, and Stenobothrus of Fischer in the 

 general make up of the body ; but differing from these in having the oc- 

 ciput tricarinate, which carina? are continuous upon the disk of the pro- 

 notum as the median and two supplementary carina?, these latter about 

 midway between the median and lateral carinse which- are common to 

 all the other genera of the sub-family Truxalime. Vertex nearly hori- 

 zontal, only moderately broad, increasing but little and extending in 

 advance of the eyes about as far as the distance which separates them, 

 the apex roundly angulate. Antenna' with the joints more or less flat- 

 tened towards the base, the apex clubbed to bluntly acuminate, of 

 moderate length, not reaching the posterior extremity of the pronotum ; 

 face oblique, slighty arcuate ; the frontal costa prominent and broad, 

 with its sides greatly divergent below, shallowly sulcate at the ocellus: 

 the lateral facial carina? rather faint, arcuate - : Pronotum short to medi- 

 um in length, somewhat tumid at the sides below, the front edge nearly 

 straight, the posterior e(\ge roundly angulate above; median carina 

 rather prominent, straight; the lateral but gently (carinatus, tricarina- 

 tits, virgatus, and variabilis} or considerably arcuate (abortivus) ; the 

 last transverse impressed line faint, nearly in the middle. Tegmina 

 from one-half to as long as the abdomen, when the latter just reaching 

 ( 9 ) or slightly surpassing the tip of the abdomen ( $ ). The anterior or 

 costal area of the former but gently inflated. Valves of ovipositor 

 short and blunt. Posterior femora stout, surpassing the tip of the ab- 

 domen. 



Second internal tibial claw almost twice as long as the first. The two 

 sexes very unequal in size, the female being much the largest. 



All the species of this genus of locusts, so far as I am aware, livo 

 through the winter as larva? or pupa?, and mature very early in spring, 

 in that respect reminding one of the genera Chortophaga, Chimaro- 

 cephala, Psoloessa, and a few of the representatives of the genera Hip- 

 piscus and Arphia among the (Edipodincc and the Tettigina: 



Eritettix variabilis sp. nov. 



Very similar in size and general structure to Stenobothrus carinatus 

 Thos., and like that insect also very variable as to color. In this latter 

 species the antenna? are acuminate instead of clavate, the vertex is nar- 

 rower between the eyes, and* the supplementary carina? of the pronotum 

 and occiput are less prominent than there. 



Size and color of carinatus. 



Hab.— Silver City, N. Mex., in the month of May fChas. IT. Marsh). 



Eritettix abortivus sp. uov. [PI. T. Figs. 8. 9.] 



Short and compact with aborted wings. In general appearance re- 

 sembling the genus Oxycoryphus, but belonging with *SY. carinatus, St. 

 tricariUatus, and St. virgatus ii; a distinct genus; very variable in 

 color, ranging from bright grass-green to dull wood-brown. 



