162 MISC. PUBLICATION 4 70, U. S. DEFT. OF AGRICULTURE 



median sulcus, and a few irregular, smooth callosities; surface densely punc- 

 tate in median sulcus, coarsely, irregularly punctate on each side, sparsely 

 clothed with a few rather short, recumbent hairs, intervals densely granulose. 



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

 nearly parallel from humeral angles to apical third, then arcuately converging 

 to tips, which are separately broadly rounded; lateral margins coarsely ser- 

 rate; basal and humeral depressions broad and shallow; disk moderately con- 

 vex and uneven; surface glabrous, with finely, densely punctured spaces of 

 irregular shape, and broad, smooth spaces, and with reticulating lines near 

 sides. Each elytron with four more or less distinct longitudinal costae ; first 

 distinct, extending from apex to near base; second and third indistinct and 

 more or less interrupted; fourth represented by a fine line following outline 

 of lateral margin. 



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

 short, semierect, whitish hairs, without distinct lateral callosities, intervals 

 densely granulose; last visible sternite deeply, semicircularly emarginate at 

 apex, without a submarginal ridge, lateral margins slightly' serrate; eighth 

 tergite deeply, angularly emarginate at apex, densely granulose, coarsely, 

 sparsely punctate, but not longitudinally carinate. Prosternum coarsely, con- 

 fluently punctate, transversely rugose, densely clothed with long, erect, whitish 

 hairs; anterior margin slightly arcuate, with a vague median lobe. Anterior 

 femur with a short, obtuse tooth, which is slightly dentate on outer margin. 

 Anterior tibia strongly arcuate, with a broad dilation at apex and a deep 

 notch behind the dilation ; middle tibia arcuate, rather abruptly, broadly dilated 

 at apex; posterior tibia straight. 

 Length 11.5 mm., width 5 mm. 



Eedescribed from the male lectotype, No. 3436, in the Academy of 

 Natural Sciences of Philadelphia. 



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

 more convex and uniformly brownish cupreous, the antenna brownish cupreous, 

 the last visible sternite with a small emargination at apex, which is limited 

 at middle by a distinctly elevated, transverse carina or plate, and with an 

 obsolete submarginal ridge, the eighth tergite rounded at apex and more 

 coarsely punctate, the prosternum sparsely punctate and more sparsely pubes- 

 cent, and the anterior and middle tibiae slightly arcuate and unarmed at 

 apices. 



Type locality. — Nevada, no definite locality. 



Distribution. — Material has been examined from various localities 

 in the following States: Arizona, California, Colorado, Idaho, Ne- 

 vada, Oregon, Utah, Washington, and Wyoming. The species is 

 also recorded in the literature by Gibson (1914) from Quamichan 

 Lake, British Columbia. Chamberlin (1926) records the holotype 

 from Arizona, but this is an error, as Horn did not have any speci- 

 mens from that State when he described the species. 



Hosts. — Adults have been reared from sugar pine (Pinus lamber- 

 tiana Douglas), twigs of western yellow pine (Pinus ponderosa Law- 

 son), and from main trunks and branches of Jeffrey pine (Pinus 

 jeffreyi "Oreg. Com."). Adults have been examined that were col- 

 lected on mountain hemlock (Tsuga mertensiana (Bongard) Sar- 

 gent), and white fir (Abies concolor Lindley and Gordon). Cham- 

 berlin (1926) records western larch (Larix Occident oik Nuttall) and 

 Douglas fir (Pseudotsuga taxifolia (LaMarck) Britton) as hosts for 

 this species. 



The color and sculpture on the upper surface of the body are rather 

 constant. The sides of the pronotum are usually sinuate and par- 

 allel along the middle, but occasionally specimens are found with 

 the pronotum widest near the apex, and the sides converging from 

 near the apices to the posterior angles. The emargination of the 



