216 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL.XX. 



what longer than the infraocular portion of the geuae; antennae dark 

 castaneous, about four-fifths as long as the hind femora. Pronotum 

 narrowest at the hinder section of the prozona, feebly expanding in 

 front, slightly more on the metazona, the piceous postocular band of 

 the lateral lobes confined to the prozona and inconspicuous from the 

 dark color of the insect, though brought slightly into prominence by 

 the slight paling of the lower portion of the lateral lobes and the rufous 

 tinge of the sides of the disk, the disk very broadly convex and pass- 

 ing by rounded shoulders simulating lateral carinae into the vertical 

 lateral lobes, where each half of the prozona is slightly and independ- 

 ently tumid; median carina distinct and rather prominent on the meta- 

 zona, blunt on the prozona, particularly between the sulci; front 

 margin feebly convex, hind margin rotundato obtusangulate; prozona 

 longitudinally subquadrate, slightly longer than the somewhat coarsely 

 punctate metazona. Prosternal spine short and stout, appressed con- 

 ical, retrorse; interspace between mesosternal lobes about half as long 

 again as broad. Tegmina abbreviate, rather broad ovate, subfusiform, 

 apically acuminate, about as long as the pronotum, attingent, blackish 

 fuscous. Fore and middle femora considerably tumid in the male; hind 

 femora rather long and slender, blackish fuscous, the outer face more 

 or less and irregularly blotched with dull testaceous, the inferior face 

 dull rufous, the whole geniculation and lower genicular lobe blackish; 

 hind tibiae very pale dull greenish, minutely flecked with fuscous, the 

 spines black almost to the base, ten to eleven in the outer series. 

 Extremity of male abdomen feebly clavate, strongly recurved, the 

 supraaual plate long triangular, subhastate, the apex subrectangulate, 

 the lateral margins narrowly elevated, the median sulcus with its low 

 rounded walls shallow, broad at extremities and narrowed near the 

 middle, where the plate is traversed by a slight transverse ridge which 

 does not reach the margins; furcula consisting of a pair of widely 

 divergent, slender, tapering, acuminate spines crossing nearly the basal 

 fourth of the supraanal plate; cerci broad, flat, sub vertical laminae, 

 slightly more compressed at apex than at base, lying nearly in one 

 plane but feebly incurved and very faintly upcurved, subequal, well 

 rounded apically particularly on the inferior margin, a little more than 

 twice as long as broad, falling considerably short of the tip of the 

 supraanal plate, rather coarsely punctate; subgenital plate small, feebly 

 subpyramidal, the apex elevated only by the gradual and exceedingly 

 slight upward curve of the margin, which as seen from above is well 

 rounded and entire. 



Length of body, male, 16 mm.; antennae, 6 mm.; tegmina, 4 mm.; 

 hind femora, 9.75 mm. 



Two males. Rabbit Ears Pass, Colorado, at the height of about 

 10,000 feet, or probably 1,000 feet below timber line, July 20, 0. F. 

 Baker (0. P. Gillette). Mr. Baker has also sent me specimens taken 

 by him at Cameron Pass in northern Colorado at a height of 11,800 

 feet, and on Clark's Peak, Colorado, at a height of 11,700 feet. 



