62 MISIC. PUBLICATION 4 7 0, U. S. DEPT. OF AGRICULTURE 



Pronotum twice as wide as long, subequal in width at base and apex, 

 widest along middle ; sides parallel at middle, obliquely converging anteriorly 

 and posteriorly; anterior margin slightly sinuate, with an indistinct, broadly 

 rounded, median lobe; base rather strongly, arcuately emarginate on each 

 side, the median lobe moderately produced and broadly rounded ; disk mod- 

 erately convex, broadly, longitudinally depressed toward the sides, with a shallow, 

 rather distinct, longitudinal, median sulcus; surface finely, sparsely punctate, 

 more or less transversely rugose, and with a few indistinct hairs. 



Elytra slightly wider than pronotum, nearly twice as long as wide, widest 

 behind middle; sides slightly diverging from humeral angles to behind middle, 

 then arcuately converging to tips, which are separately broadly rounded; lat- 

 eral margins finely serrate; basal and humeral depressions elongate and rather 

 deep; disk rather strongly convex and uneven; surface very sparsely clothed 

 posteriorly with short, erect, inconspicuous hairs, sparsely, finely, irregularly 

 punctate, intervals indistinctly granulose. Each elytron with four longitu- 

 dinal costae ; first one obsolete basally, sharply defined on apical two-thirds, and 

 gradually curving away from the suture posteriorly; second broken up into 

 three portions by two shallow foveae, basal part short and irregular, the median 

 part straight and distinct, occupying middle third of elytron, and the apical 

 part distinct, not reaching tip of elytron ; third extending from humerus 

 (curving obliquely inward) to beyond middle of elytron, where it ends at a 

 large fovea ; and fourth scarcely defined, extending along lateral margin from 

 near humerus to near the tip of the second costa. 



Abdomen coarsely, shallowly, irregularly punctate, sparsely at middle, more 

 densely toward sides, where it is more or less rugose, sparsely clothed with 

 moderately long, recumbent, white hairs, with more or less distinct lateral 

 callosities, intervals indistinctly granulose; last visible sternite broadly, deeply, 

 arcuately emarginate at apex, with a few sharp asperities at sides, lateral 

 margins serrate; eighth tergite slightly emarginate or subtruncate at apex, 

 sparsely, coarsely punctate, but not longitudinately carinate. Prosternum 

 coarsely, densely punctate, sparsely clothed with long, recumbent, white hairs, 

 with a broad, short lobe in front. Anterior femur with a broad, obtusely trian- 

 gular tooth, which is dentate on outer margin. Anterior tibia slightly arcuate, 

 with a short, rounded dilation at apex, the dilation not one-fourth as long as 

 tibia ; middle and posterior tibiae straight, middle pair abruptly expanded at apex. 



Length 9 mm., width 3.8 mm. 



Redescribed from the male paratype in the California Academy 

 of Sciences, reared from "chaparral broom" (Baccharis pilularis De 

 Candolle) collected at the type locality, June 27, 1919, by H. E. 

 Burke. 



Female. — Differing from the male in having the head more coarsely punc- 

 tured, the last visible sternite shallowly, arcuately emarginate at apex, the 

 prosternum more sparsely and finely punctured, and the tibiae unarmed at their 

 apices. 



Type locality. — Los Gatos, Calif. ; type in the California Academy 

 of Sciences. . . 



DISTRIBUTION 



From material examined : 



California: Los Gatos, June- July 1917, reared (F. B. Herbert and H. E. Burke). 

 Laurel, June 27, 1918 (F. B. Herbert). Mill Valley, Marin County, July 

 19, 1925 (H. H. Kiefer). Santa Cruz Mountains (A. Koebele). 



Also recorded in the literature from : 



California: Fairfax, Marin County, June 24, 1908 (E. C. Van Dyke). Mt. 

 Tamalpais, Marin County, April (Linsley and Us-'nger). 



Hosts. — H. E. Burke reared this species from "chaparral broom" 

 (Baccharis pilularis De Candolle) , a very common and worthless shrub 

 of the family Compositae. 



