186 MISC. PUBLICATION 4 7 0, U. &. DEPT. OF AGRICTJLTTJRE 



margin deeply, triangularly emarginate at apex. Prosternum coarsely, con- 

 fluently punctate, more or less rugose, densely clothed with long, erect, whitish 

 hairs ; anterior margin truncate, without a distinct median lobe. Anterior 

 femur with a broad, obtusely rounded tooth, which is slightly dentate on outer 

 margin. Anterior tibiae strongly arcuate, with an elongate, arcuate dilation, 

 which is distinctly narrowed at apex, strongly constricted behind the dilation; 

 middle tibia moderately arcuate, gradually dilated toward apex; posterior 

 tibia straight. 



Length 11 mm., width 4.5 mm. 



Redescribed from a male paratype from the type locality in the 

 United States National Museum, kindly donated by Dr. Van Dyke. 



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

 brown, the underside of the body purplish cupreous, with a distinct bronzy- 

 green tinge, the prosternum more coarsely, sparsely punctured, and more 

 sparsely pubescent, the eighth abdominal tergite more densely punctured, the 

 last visible abdominal sternite narrowly, arcuately emarginate at apex, and 

 the anterior tibia unarmed near apex. 



Type locality. — Grant County, Oreg.; type in collection of E. C. 

 Van Dyke (California Academy of Sciences) . 



DISTRIBUTION 



From material examined : 



Oregon: Grant County, July 22, 1914, one female and one male paratype (W. J. 

 Chamberlin). Baker, July 30, 1938 (J. H. Baker). 



Also recorded in the literature as follows: 



California: Angora Lake, July 7 (Van Dyke 1916). Lake Tahoe and Tuolumne 



Meadows, Yosemite National Park, July 11, 1916 (Chamberlin 1917). 

 Idaho: Cascade, June 26 (Chamberlin 1926). 

 Utah: Para wan Mountains (Chamberlin 1926). 



Hosts. — The larval habits are unknown, but Van Dyke (1916) re- 

 cords collecting the adults on western larch (Larix occidentalis 

 Nuttall) and lodgepole pine (Pinus contorta var. murrayana Engel- 

 mann) . 



Van Dyke had a fairly good series of specimens when he described 

 the species and stated that — 



The specimens examined from the type locality were quite constant as to size 

 and characters, but a small series collected in the Tuolumne Meadows differed 

 slightly from the typical form found in eastern Oregon in being more cupreous 

 and brilliantly metallic, by having the transverse punctate areas on the elytra 

 more definitely defined, the sutural elevations more widely explanate near the 

 apex, and the dilated portion of the anterior tibia of the male less broad, though 

 of the same type. 



He stated further that this species seems to belong in the northern 

 part of the Great Basin, to be found normally on larch and lodgepole 

 pine, and to have followed the latter in its distribution through the 

 high altitudes of the Cascades and Sierras; and he gives the type 

 locality as Grant County, Oreg., but Chamberlin (1926) records the 

 type locality as Sumpter, Oreg. 



