60 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



spicuous hairs. Scutellum feebly, transversely carinate, and the 

 surface finely, densely reticulate. 



Elytra slightly wider than pronotum at base, and about equal 

 in width at base and behind middle; sides nearly parallel or feebly 

 sinuate for a short distance behind base, broadly, arcuately con- 

 stricted in front of middle, broadly, arcuately expanded behind 

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

 broadly rounded, and coarsely, densely serrulate; sides of abdomen 

 narrowly exposed above; disk vaguely flattened, without longitudi- 

 nal costae, sutural margins elevated behind middle, and with broad, 

 shallow, basal depressions ; surface rather coarsely, densely imbricate- 

 punctate, and sparsely, uniformly clothed with short, recumbent, 

 white hairs. 



Abdomen beneath obsoletely granulose, finely, sparsely punctate 

 except on first segment where the surface in coarsely punctate 

 and transversely rugose, and sparsely, uniformly clothed with short, 

 recumbent, whitish hairs; first segment feebly flattened at middle; 

 second segment convex, and without a groove at middle; vertical 

 portions of segments rather densely but not conspicuously pubes- 

 cent; last segment broadly rounded at apex; pygidium coarsely, 

 densely punctate, feebly, longitudinally carinate, but the carina not 

 projecting. Prosternum finely, densely punctate, somewhat rugose, 

 and sparsely clothed with long, erect, inconspicuous hairs; prosternal 

 lobe broad, feebly declivous, and broadly but not deeply, arcuately 

 emarginate in front; prosternal process broad, the sides parallel to 

 behind coxal cavities, then arcuately narrowed to the apex, which is 

 acute. Tibiae slender, and the anterior and middle pairs armed with 

 a rather long tooth on inner margin at apex. Posterior tarsi dis- 

 tinctly shorter than tibiae, and the first joint as long as the following- 

 three joints united. Tarsal claws similar on all feet, cleft near mid- 

 dle, the outer tooth acute at apex, the inner one broader, turned in- 

 ward, and the tip touching that of the opposite side. Genitalia 

 similar to those of arcuatus Say. 



Length, 7.75 mm. ; width, 1.9 mm. 



Female. — Differs from the male in being usually more robust, front 

 of head uniformly brownish cupreous, and more vaguely punctured ; 

 pronotum aeneous, with a vague cupreous reflection ; antennae extend- 

 ing to middle of pronotum, and the outer joints as wide as long; 

 prosternum more vaguely punctured, and not clothed with long, 

 erect hairs at middle ; first abdominal segment convex at middle, and 

 the tibiae unarmed at apex. 



Type locality. — Williams, Ariz. 



Other localities.— Texas : Chisos Mountains, July 19 ; Davis Moun- 

 tains, July 9, (H. A. Wenzel). New Mexico : White Mountains, July 

 18 (C. H. T. Townsend). 



