424 PROCEEDINGS OF THE NATIONAL MUSEUM. yol.xxiii. 



tions and the apex with the usual scattered punctations, usually rather 

 faint and more distinct on either margin than in the middle. Wings 

 broad, If times as long as hroad, with the apex not attenuate; fuscous 

 band moderately broad, at least a sixth as wide as the length of the 

 wing and very distinct, continued along the posterior margin more 

 than halfway to the anal angle; spur short, extending toward the base 

 about one-third of the distance. Posterior femora unusualh* heavy, 

 with the inside. j^ellow, more or less suffused with red, and crossed by 

 three black bands, the basal sometimes much reduced; outer side 

 crossed transversely b}' one distinct subapical band, a continuation of 

 the one on the inner surface; lower sulcus red, crossed b}^ the same 

 subapical band. Posterior tibiae bright red, with an indefinite subbasal 

 yellow cloud on the outer face only. 



Length of body, male 21 to 26 mm., female 23 mm,; length of 

 tegmina, male 21^ to 25 mm., female 22 mm.; length of posterior 

 femora, male 11 to 13 mm., female, 13 mm. Two males, Hot Springs, 

 South Dakota; one male and one female, Cheyenne, Wyoming, Bru- 

 ner collection; one male and one female, Chadron, Nebraska; one male 

 and one female. Hot Springs, South Dakota, Stanford University 

 collection. 



While this species resembles Hadrotettix trlfasclata so strongly in 

 coloration as to readil}^ be mistaken for it, in generic characters it 

 is allied in every particular to Trimerotrojns^ where the latter genus 

 differs from the former. The distinct sulcation of the scutellum of 

 the vertex, with a plain median carina, the slender though long anten- 

 nae, the presence of distinct shoulders on the prozone of the pronotum, 

 the relatively long tegmina, which does not have a third band as well 

 defined as the second, but the usual group of annular spots, the com- 

 parativeh" little thickened tegmina, which are not densely coriaceous 

 beyond the outside of the basal band and which have quadrate cells 

 much within the basal branch of the radial sector, in the character 

 of the fuscous band which is quite trimerotropine and extremely dif- 

 ferent from that of Hadrotettix^ which lies entireh' beyond the middle, 

 so that the disk is longer than wide, and has a long continuation upon 

 the posterior margin which is greater in length than the transverse 

 portion of the band. And finally in the coloration of the inside of the 

 posterior femora, which seems to me to be one of the most trustworthy 

 guides to relationship because it is not subject to natural selection. 

 These in Iladrotettlx arc deep indigo blue, extending entirely over the 

 inner face (including the upper sulcus, which is not true of a single 

 Trimerotropli)^ interrupted by one broad, whitish band. If this spe- 

 cies and one other, which is more like JIadrotc4ti.r, not to mention 

 other species which are structurally, though not in coloration, nearer 

 to it, are retained in that genus there would not remain a single salient 

 character to distinguish the genus. For these reasons I have felt it 



