330 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



erately convex, without median or lateral depressions, and without 

 any trace of prehumeral carinae ; surface obsoletely granulose, feebly, 

 obliquely rugose, the rugae widely separated, and sparsely clothed 

 with short, inconspicuous, recumbent, whitish hairs. Scutellum not 

 transversely carinate, but the surface finely reticulate. 



Elytra slightly wider than pronotum at base ; sides nearly parallel 

 to behind middle (arcuately constricted in front of middle), then 

 obliquely narrowed to the tips, which are conjointly, very broadly 

 rounded, and strongly serrulate; sides of abdomen scarcely visible 

 from above; disk moderately convex, the sutural margins elevated 

 posteriorly, with broad, shallow basal depressions, but without 

 costae or longitudinal depressions along suture; surface coarsely 

 imbricate-punctate and distinctly clothed with uniformly spaced, 

 moderately long, recumbent silvery white hairs. 



Abdomen beneath finely, transversely reticulate, the reticulation 

 widely separated, and sparsely clothed with short, recumbent, sil- 

 very white hairs; vertical portions of segments not conspicuously 

 pubescent; first segment with a short, smooth, median groove at 

 the posterior margin ; pygidium more or less longitudinally carinate, 

 but the carina not projecting posteriorly. Prosternum sparsely, 

 finely punctate, and sparsely clothed with long, erect, whitish hairs, 

 which extend along the median part of the body to abdomen; pro- 

 sternal lobe broad, strongly declivous, and subtruncate, or broadly, 

 feebly emarginate in front ; prosternal process rather broad, the sides 

 nearly parallel to behind the coxal cavities, then arcuately attenuate 

 to the apex, which is obtusely rounded. Posterior coxae with the 

 posterior margin sinuate and the exterior angle not prolonged. 

 Tibiae slender, the anterior pair slightly arcuate and the anterior 

 and middle pairs armed with a rather long, arcuate tooth on the 

 inner margin at apex. Posterior tarsi about as long as the tibiae and 

 the first joint slightly longer than the second one. Tarsal claws 

 dissimilar, the anterior claws cleft near the middle, the two teeth 

 acute at tips, and nearly equal in length ; middle and posterior claws 

 cleft near middle, the inner tooth broad, about one-half as long as 

 the outer tooth, and not turned inward. 



Length, 3.75 mm. ; width, 0.875 mm. 



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

 ish cupreous and the surface not quite so densely pubescent; pro- 

 sternum very sparsely punctured and without long pubescence; first 

 abdominal segment convex, and not sulcate at middle, and the tarsal 

 claws similar on all feet, cleft near the middle, the inner tooth broad, 

 shorter than outer one, and not turned inward. 



Kedescribed from the male lectotype, No. 3490, in the Philadelphia 

 Academy of Natural Sciences. 



Type locality. — Southern Arizona (no definite locality given). 



