188 MISC. PUBLICATION 4 7 0, IT. S. DEPT. OF AGRICULTURE 



Elytra at base slightly wider than pronotum at middle, twice as long as 

 wide; sides nearly parallel from humeral angles to apical third (slightly ex- 

 panded behind middle), then arcuately converging to tips, which are separately 

 broadly rounded ; lateral margins rather obscurely serrate ; basal depressions 

 broad, irregular, very deep ; humeral depressions broad, shallow ; surface glabrous, 

 uneven, with numerous small, irregular, smooth spaces connected laterally to 

 the costae, densely, finely punctate between the smooth spaces. Each elytron 

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

 with sutural margin, slightly sinuate, narrow and strongly elevated, extending 

 from base to apex ; the other three costae moderately distinct, narrow, smooth, 

 strongly sinuate, broadly interrupted by the numerous densely punctured areas. 



Abdomen beneath rather densely, coarsely fossulate-punctate, except anterior 

 margins of sternites, which are smooth, clothed with a few short, recumbent 

 hairs at sides, intervals obsoletely granulose ; each sternite with a small, slightly 

 elevated, smooth callosity on each side near lateral margin ; last visible sternite 

 deeply, semicircularly emarginate at apex, without a distinct submarginal ridge, 

 lateral margins serrate; eighth tergite deeply, angularly emarginate at apex, 

 sparsely, coarsely punctate, without a longitudinal carina. Prosternum trans- 

 versely depressed along anterior margin, coarsely, confiuently punctate, densely 

 clothed with long, erect, fine, whitish hairs ; anterior margin truncate, without 

 a median lobe. Anterior femur with a broad, obtusely rounded tooth, which is 

 coarsely dentate on outer margin. Anterior and middle tibiae strongly arcuate, 

 the former with a rather long, rounded dilation, which is slightly narrowed near 

 apex, slightly sinuate behind dilation ; posterior tibia straight. 



Length 11.5 mm., width 5 mm. 



Eeclescribed (except antenna, which is missing from type) from the 

 male type in the collection of H. C. Fall (Museum of Comparative 

 Zoology). 



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

 with a faint violaceous tinge, and more coarsely punctured, the antenna piceous 

 with a bronzy tinge, the underside of the body purplish cupreous, with a 

 bronzy-green reflection, the prosternum coarsely, sparsely punctured, and more 

 sparsely pubescent, the last visible abdominal sternite more elongate, and more 

 narrowly emarginate at apex, the eighth abdominal tergite slightly emarginate 

 at apex, and the anterior tibia unarmed at apex. 



Type locality. — Sylvania, Calif. 



DISTRIBUTION 



From material examined : 



British Columbia: Victoria, July 1. 1904 (Wickham coll.). 

 California: Sylvania, type (L. E. Ricksecker). 

 Oregon: Amity, April 16, 1930 (W. J. Buckhorn). 



It is recorded by Van Dyke (1916) from Sonoma and Del Norte 

 Counties, Calif., and Mount Jefferson, Oreg., and by Chamberlin 

 ( 1926) from Corvallis, Douglas County, and Forest Grove, Oreg. 



Hosts. — Chamberlin (1920) records this species as breeding in 

 Douglas fir (Pseudotsuga taxifolia (LaMarck) Britton) in Oregon, 

 and gives a rather extensive account of its life history, including de- 

 scriptions of the egg, larva, and pupa. The same writer (1917) men- 

 tioned it as having been collected from apple (Malus sp.), but this is 

 probably an error, either in the identification of the specimens or the 

 host plant. 



The color in the punctured areas on the dorsal surface of the body 

 varies from brownish cupreous to bronzy green. Frequently the 

 lateral depressions on the pronotum are indistinct, and the surface 

 is ornamented with four small, irregular, smooth callosities arranged 

 transversely in front of the middle. The length is from 11.3 to 12 mm. 



