250 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



hairs. Scutellum not transversely carinate, but the surface more 

 or less rugose, and finely reticulate. 



Elytra about as wide as pronotum at base, and equal in width at 

 base and apical third; sides nearly parallel from base to apical 

 third (broadly, vaguely constricted at middle), then obliquely nar- 

 rowed to the tips, which are separately, rather narrowly rounded, 

 and coarsely serrulate ; sides of abdomen broadly exposed above ; disk 

 longitundinally depressed along the pubescent vittae, sutural margins 

 slightly elevated posteriorly, and with broad, shallow basal depres- 

 sions; surface densely, coarsely imbricate-punctate, sparsely, uni- 

 formly clothed with short, recumbent, white hairs, and each elytron 

 ornamented with a vitta of sparsely placed white hairs extending 

 from the basal depression to apex. 



Abdomen beneath finely, sparsely punctate, more or less rugose 

 on the basal segment, and rather densely clothed with recumbent, 

 white hairs, which have a tendency toward forming spots at the sides 

 of the third and fourth segments; first segment slightly flattened, 

 and clothed with slightly longer and denser hairs at the middle; 

 vertical portions of the segments rather densely pubescent ; pygidium 

 finely punctate, but not distinctly carinate posteriorly. Prosternum 

 finely, densely rugose, and densely clothed with long, erect, white 

 hairs; prosternal lobe rather narrow, strongly declivous, and broadly 

 truncate in front; prosternal process broad, slightly expanded behind 

 the coxal cavities, then abruptly narrowed to the apex, which is 

 acute. Tibiae slender, nearly straight, and the anterior pair armed 

 with a small tooth on inner margin at apex (middle legs missing). 

 Posterior tarsi nearly as long as the tibiae, and the first joint as long 

 as the following two joints united. Tarsal claws on posterior feet 

 cleft near the middle, the inner tooth broad, shorter than outer one, 

 and not turned inward (claws on anterior and middle feet missing). 



Female. — Differs from the male in having the prosternum sparsely 

 clothed with recumbent, white hairs, the first abdominal segment 

 convex, and not clothed with longer hairs at the middle, and the 

 tibiae without a distinct tooth on inner margin at apex. 



Length, 5.75 mm. ; width, 1.3 mm. 



Type locality. — Nogales, St. Cruz County, Ariz. 



Other localities. — Downing's Kanch, Terrell County, Tex. 



Type and, allotype. — In the collection of H. C. Fall. Paratype, 

 Cat No. 41006, U.S.N.M. 



Described from three examples (one type). The type and allotype 

 were collected at the type locality August 12, 1906, by H. C. Fall, 

 and the female paratype on the Downing's Ranch, Terrell County, 

 Tex., May 10, 1912, by J. D. Mitchell. The paratype is smaller than 

 the types, measuring only 4.5 millimeters in length, but otherwise 

 they are nearly identical. 



