52 BULLETIN 145, UNITED STATES NATIONAL MUSEUM 



depressions ; surface finely, densely imbricate-punctate, and sparsely, 

 uniformly clothed with more or less distinct, short, whitish hairs 



Abdomen beneath rather densely, finely punctate, becoming trans- 

 versely rugose on basal segment, and sparsely, uniformly clothed 

 with rather short, recumbent, whitish hairs; first and second seg- 

 ments convex, and without a groove at middle ; last segment broadly 

 rounded at apex; vertical portions of segments sparsely pubescent; 

 pygidium sparsely, coarsely punctate, but not distinctly carinate. 

 Presternum finely, densely punctate, and rather densely clothed 

 with long, erect, inconspicuous hairs; prosternal lobe broad, moder- 

 ately declivous, and subtruncate or broadly, vaguely emarginate in 

 front ; prosternal process broad, the sides parallel to behind the coxal 

 cavities, then obliquely narrowed to the apex, which is acute. Tibiae 

 slender, and the anterior and middle pairs armed with a short tooth 

 on inner margin at apex. Posterior tarsi slightly shorter than 

 tibiae, and the first joint as long as the following three joints united. 

 Tarsal claws similar, on all feet, cleft near the apex, the inner 

 tooth shorter and distinctly broader than outer one, turned inward, 

 but the tips distinctly separated. Genitalia similar to those of 

 angelicus Horn. 



Length, 7.5 mm. ; width, 2.2 mm. 



Female. — Differs from the male in having the upper surface 

 reddish cupreous, and sometimes with a distinct purplish tinge on 

 certain parts, presternum more sparsely punctured and without long, 

 erect hairs at middle, and the tibiae not armed with a distinct tooth 

 at apex. 



Type locality. — Ashland, Oregon. 



Other localities. — Placerville, Shingle Springs, and Hullville, 

 Calif. 



Type, allotype, and paratypes. — Cat. No. 40989, U.S.N.M. Para- 

 types in W. J. Chamberlin's collection. 



Ya nations. — The series examined show very little variation except 

 in size, which varies from 5.75 to 7.5 millimeters in length, and 1.75 

 to 2.2 millimeters in width. 



Described from a large series of both sexes collected at the above 

 localities by H. E. Burke, F. B. Herbert, George Hofer, and L. B. 

 Reynolds. According to H. E. Burke, this species mines the bark 

 and wood of branches and main trunks of normal madrono or 

 manzanita {Arbutus menziesii Pursh). The adults fly from May to 

 August, and lay their eggs singly on the smooth bark of the branches 

 and trunks, the larvae girdle and kill the branches, causing the for- 

 mation of enlarged galls, and take two years to reach maturity. 



This species is very closely allied to angelicus, and will be confused 

 with that species in most collections. It will be rather difficult to 



