392 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



the anterior and posterior halves of the lateral lobes nearly symmetri- 

 cal ; disk obscured with fuscous or dark brown, with equal sides ; the 

 median carina, which is marked with dark brown and is distinct 

 though slight on the inetazona, is obsolete on the prozona, represented 

 only by the dark line, sometimes faintly impressed ; lateral carinae very 

 obscure, converging anteriorly, and distinguished by a narrow, dull 

 yellow stripe, the rest of the disk and the upper part of the lateral lobes 

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

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

 deeper color, unites thetwopercurrent sulci of the lateral lobes in the mid- 

 dle ; anterior margin of the prozona marked by a submarginal continuous 

 sulcus, distinct only on the lateral lobes 5 posterior border of the meta- 

 zona very broadly rounded or subaugulate. Prosternal spine straight, 

 rather slender, subconical, bluntly pointed. Teginina subovate, slightly 

 longer than the pronotum in the form jucundus, fully half as long as the 

 abdomen in the form enigma, fully as long as and generally much longer 

 than the abdomen in the form collaris, brownish fuscous, the longitudi- 

 nal veins mostly yellowish, and flecked, principally along the median 

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

 ish fuscou* spots, the apex subacuminate when abbreviate, well rounded 

 when fully developed ; wings pellucid with fuscous veins. Pleura with 

 an oblique, bright yellow stripe, 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, an gulate, transverse 

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

 obsolete or obsolescent, on tne 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 rather 

 short triangular, the sides feebly sinuate, the apex acute, the surface 

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

 the lateral margins and the thereto parallel, 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. ; teginina, male, 21.5 mm., female, 23 mm. ; hind femora, 

 male, 14 mm., female, 16 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.N.M. ; S. Henshaw) La Chappies, 

 Yakima County, Washington, July 1C (Museum Comparative Zoology); 



