392 rnncEEnisr.s OF THE XATinsAL MrsEr.yr. vm..xT. 



the anterior and posti'rior halves of tlu» lateral lolxvs nearly Mynnnetri- 

 cal; disk ob.scured witli InscouH or dark brown, witli eijuai sid<'s; tiie 

 median carina, whieli in nuirked with dark brown and is distinct 

 though slight on the nietazona, is obsoh'te on the prozona, represented 

 only by the dark lim', sometimes faintly impressed ; lateral earinae very 

 obscure, converging anteriorly, an<l distinguished by a narrow, dull 

 yellow stripe, the rest of the disk and the up])er part of the lateral lolx's 

 being obscurely marked with <lusky brown, which on the lateral lobes is 

 darkest in the sulci; a distinct longitudinal sulcus, more distinct for its 

 deepercolor,unitestlietwo})ercurrent sulci of the lateral lobes in the mid- 

 dle; anterior margin of the i)rozona Uiarked by a submarginal continuous 

 sulcus, distinct oidy on the lateral lobes; posterior border of the meta- 

 zona very broadly rounded or subangulate. Prosternal spine straight, 

 rather slender, subconical, bluntly i)ointed. Tegmina subovate, slightly 

 longer than the i)ronotum in the form /»((•««////«, fully half as long as the 

 abdomen in the form r;///;>Hr(, fully as long as an<l generally much longer 

 than the abdonien in the form vollantt, brownish fuscous, the longitudi- 

 nal veins mostly yellowish, and tlecked, principally ahmg the median 

 area but also without it, with longitudinal series of sulxpiadrate, black- 

 ish fuscous spots, the apex subacununate when abbreviate, well rcmnded 

 when fully developed ; wings i)ellucid with fuscous veins. Pleura with 

 an obli<iue, bright yellow strii)e, edged with black above the hind coxae. 

 Hind femora luteous, the outer and in part the upper face marked by 

 a large, apical, yellowish brown spot, a very broad, angulate, transverse 

 median band of the same color, ami a similar basal band, sometimes 

 obsoleti' or obsolescent, on the lower half; outer arc of upper genicular 

 lobes black; tibiae glaucous, yellow on the sides and at extreme base, 

 the apical half of the spines black; arolium either quadrate, rather 

 narrow, longer than the claws (male) or obpyriform, small, but little 

 more than half as long as the claws (female). Abdomen yellow, the 

 sides chafed by the femora dark fuscous ; supraanal plate of male ratli«r 

 short triangular, the sides feebly sinuate, the ai)ex acute, the surface 

 marked by a pair of deep aiul broad converging sulci, lying between 

 the lateral margins and the thereto jjarallel, elevated and rather sharp 

 ridges, which inclose a deep, triangular, basal sulcus; a slender deli- 

 cate median sulcus on apical half; cerci very broadly expanded and 

 bullate at the base, tapering rapidly and regularly just beyond the 

 middle, beyond less rapidly, forming a delicate, slender, but bluntly 

 pointed tip, slightly hooked downward and feebly incurved. 



Length of body, male, 25 mm., female, 24 mm.; antennae, male and 

 female, 8.5 mm. ; tegmina, male, 21.5 mm., female, 23 mm. ; hind femora, 

 male, 14 mm., female, IG mm. These measurements are taken from the 

 form collar is. 



Seventy one males, 78 females. Boise City, Ada County, Idaho (U.S. 

 N.M.); Washington, Morrison (U.S.X.M.; S. Henshaw) La Chappies, 

 Yakima County, Washington, July 10 (Museum Comparative Zoology)^ 



