170 BULLETIN 145. UNITED STATES NATIONAL MUSEUM 



Elytra about equal in width to the pronotum at base, and slightly 

 wider at base than just behind the middle; sides nearly parallel for 

 a short distance behind the base, feebly, broadly, arcuately constricted 

 in front of middle, broadly, arcuately expanded behind the middle, 

 then obliquely narrowed to the tips, which are separately, broadly 

 rounded, or subtruncate, and coarsely, irregularly -serrulate ; sides of 

 abdomen broadly exposed above; disk slightly flattened, with a dis- 

 tinct, broad, smooth costa extending from the humeri to near the 

 apex, the sutural margins distinctly elevated behind the middle, and 

 with broad, shallow basal depressions ; surface densely, finely punctate 

 (except on the costae), more coarsely toward the sides, and each 

 elytron ornamented with a broad vitta between the costa and suture, 

 extending from the basal depression to the apex, and interrupted 

 twice in the apical region, and composed of densely placed, recumbent 

 whitish hairs. There is also an obsolete vitta of sparsely, irregularly 

 placed hairs of the same color toward the lateral margin. 



Abdomen beneath rather sparsely, coarsely punctate on the median 

 part, more densely toward the sides; first and second segments with 

 a densely pubescent vitta a short distance from the lateral margins, 

 and extending along the lateral margins of the following segments; 

 first segment convex at middle, and without a median groove; last 

 segment broadly rounded at apex; vertical portions of segments 

 densely clothed with recumbent, whitish pubescence; pygidium 

 feebly carinate at middle, but the carina not projecting. Prosternum 

 coarsely and rather densely punctate, the punctures more or less con- 

 fluent posteriorly, and nearly glabrous ; prosternal lobe broad, moder- 

 ately declivous, and feebly, broadly, arcuately emarginate in front; 

 prosternal process broad, the sides nearly parallel to behind the coxal 

 cavities, then broadly rounded to the apex, which is rather obtuse. 

 Tibiae slender; anterior and middle pairs arcuate, and armed with 

 a short tooth on inner margin at apex. Posterior tarsi slightly 

 shorter than the tibiae, and the first joint slightly longer than the 

 following three joints united. Tarsal claws similar on all feet, cleft 

 near the middle, the outer tooth long and acute at tip, the inner one 

 much shorter and broader, and not turned inward. 



Length, 10.5 mm. ; width, 2.75 mm. 



Male. — Differs from the female in having the front of head sparsely 

 clothed with long, recumbent, whitish hairs, especially behind the 

 epistoma ; prosternum and middle part of body densely clothed with 

 long, semierect, whitish hairs, and all three pairs of tibiae armed with 

 a strong tooth on inner margin at apex. 



Redescribed from the female type of couesii (No. 1) in the Museum 

 of Comparative Zoology at Cambridge. 



