190 MISC. PUBLICATION 47 0, U. S. DEPT. OF AGRICTJLTUKE 



Pronotum twice as wide as long, slightly narrower at apex than at base, 

 widest along middle; sides parallel at middle, arcuately converging at apex 

 and base; anterior margin rather strongly sinuate, with an obsolete, broadly 

 rounded, median lobe; base slightly, arcuately emarginate on each side, median 

 lobe slightly produced and broadly rounded; disk slightly convex, uneven, with 

 an obscure, broad, longitudinal, densely punctured, median sulcus, limited at 

 each side on apical half by a broad, elevated, smooth callosity, and on each 

 side with numerous small, irregular, smooth callosities ; surface coarsely, deeply, 

 irregularly, confluently punctate between the smooth callosities. 



Elytra distinctly wider than pronotum, twice as long as wide; sides parallel 

 from humeral angles to apical third, then arcuately converging to tips, which 

 are separately broadly rounded ; lateral margins coarsely serrate ; basal depres- 

 sions broad, very deep ; humeral depressions broad, moderately deep ; surface 

 glabrous, uneven, intervals between costae consisting of finely, densely punc- 

 tured areas and smooth spaces, the smooth spaces joined to the costae. Each 

 elytron with four more or less distinct longitudinal costae ; first distinct, 

 straight, extending along sutural margin from apex to basal depression ; second 

 and third irregular, moderately distinct, but interrupted by the punctured 

 spaces; fourth sinuate, indistinct, extending along lateral margin from behind 

 humerus to near apex, where it is united to the second costa. 



Abdomen beneath finely, sparsely, irregularly punctate, sparsely clothed at 

 sides with short, recumbent, white hairs, without distinct lateral callosities, 

 intervals indistinctly granulose ; last visible sternite deeply, semicircularly 

 emarginate at apex, without a submarginal ridge, lateral margins serrate ; 

 eighth tergite thickened at apex, sparsely, finely punctate, dorsal margin deeply, 

 triangularly emarginate at apex. Prosternum coarsely, sparsely, irregularly 

 punctate, sparsely clothed with long, erect, white hairs ; anterior margin trun- 

 cate, without a median lobe. Anterior femur with a broadly rounded tooth, 

 which is slightly dentate on outer margin. Anterior and middle tibiae arcuate, 

 the former with a rather long, feeble dilation at apex, slightly sinuate behind 

 dilation ; posterior tibia straight. 



Length 13 mm., width 5 mm. 



Kedescribed from the male type, No. 2697, in the Museum of Com- 

 parative Zoology, Cambridge, Mass. 



Female. — Differing from the male in having the front of the head slightly 

 more convex, purplish cupreous, with a slight greenish tinge, the antenna 

 piceous, with a faint greenish reflection, the last visible abdominal sternite 

 more elongate, broadly, shallowly emarginate at apex, sometimes transversely 

 truncate at middle of emargination, with the external angles strongly produced 

 and rounded, the eighth abdominal tergite coarsely, densely punctate, with a 

 small, triangular notch at apex, and the anterior tibia unarmed at apex. 



Type locality. — American Fork Canyon (9,500 feet), Utah. 



DISTRIBUTION 



From material examined : 



Arizona : Bright Angel Ranger Station, north rim Grand Canyon, June 26, 1924 

 (G. Hofer). 



British Columbia: Frve Creek, July 23. 1903 (R. P. Currie and A. N. Caudell). 

 Merritt, Midwav Valley, June 28, 1921 (K. F. Auden). 



Colorado: Colorado Springs, June 15-30, 1896, 6.000 to 7,000 feet (H. F. Wick- 

 ham). Waldo Canyon, July 12, 1916 (W. D. Edmonston). 



Montana: Chico, August 9, 1907 (W. Robinson). Bozeman, 4,SO0 feet 

 ("Cooley"). 



Nevada : No definite locality. 



Utah: American Fork Canyon, 9,500 feet, August 2-3, 1S77, type (F. C. Bow- 

 ditch). Kamas, July 30, 1907 (H. E. Burke). 



Wyoming: Yellowstone National Park, August 12, 1907 (W. Robinson) ; July 31 

 (Hubbard and Schwarz). 



This species has been recorded in the literature from various locali- 

 ties in Arizona, California, Colorado, Idaho, Michigan, Montana, 

 Nevada, New Mexico, Oregon, Utah, and Washington, but many of 



