152 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



hairs; prosternal lobe broad, moderately declivous, and broadly but 

 not very deeply, arcuately emarginate in front; prosternal process 

 broad, the sides parallel to behind the coxal cavities, then arcuately 

 narrowed to the apex, which is acute. Tibiae slender, and the an- 

 terior and middle pairs armed with a very short, broad tooth on inner 

 margin at apex. Posterior tarsi nearly as long as the tibiae, and the 

 first joint as long as the following three joints united. Tarsal claws 

 nearly similar, anterior and middle pairs cleft one-third from tip, 

 and the teeth nearly equal in length; posterior claws cleft near 

 middle, the inner tooth slightly shorter than outer one, feebly turned 

 inward, but the tips distant. 



Female. — Differs from the male in having the front of head uni- 

 formly brownish cupreous, broader, slightly more convex, and the 

 lateral margins more parallel to each other; eyes slightly narrower 

 and equally rounded above and beneath ; abdominal segments convex 

 at middle, last abdominal segment more broadly rounded at apex, 

 and the tibiae without a distinct tooth at apex. 



Length, 7.5-9.75 mm.; width, 1.75-2.50 mm. 



Type locality. — Yreka, Calif. 



Other localities. — California: Palo Alto; Oakridge; Cole; and 

 Moore, Menlo Park. British Columbia: Men-it, Midday Valley. 

 Montana : Missoula. 



Type, allotype, and paratypes. — Cat. No. 40997, U.S.N.M. Para- 

 types in the collections of C. A. Frost, W. J. Chamberlin, J. N. Knull, 

 Ralph Hoppings, H. E. Burke, and the Canadian National Collection. 



Described from 31 specimens (one type). Type and one male 

 para type collected at the type locality June 11, on Lombardy poplar 

 (Populus nigra var. italica DuRoi) by H. E. Burke; allotype and 

 three paratypes reared from wood of the same host collected at Palo 

 Alto, by R. D. Hartman; eight paratypes from Palo Alto, reared 

 from black cotton wood (Populus trichocarpa Hooker), by R. D. 

 Hartman; two paratypes collected at Moore, Menlo Park, during 

 July on poplar by H. E. Burke; two paratypes collected at Cole, 

 during July; four paratypes collected at Oakridge, May 30 and 

 June 29, on Oregon alder {Alnus rubra Bongard) by W. J. Cham- 

 berlin; three paratypes from Missoula, Mont., reared from black 

 cottonwood {Populus trichocarpa Hooker) by J. J. Sullivan; and 

 six paratypes collected at Merritt, Midday Valley, British Columbia, 

 during July, by K. F. Auden. 



These specimens vary considerably in size, but are rather uniform 

 in coloration, although the specimens from Oakridge, which were 

 collected on alder, have the elytra more golden green, with only a 

 feeble cupreous tinge. The depressions on the pronotum show 

 considerable variation. 



