90 BITT.LETTN 03, ItNTTED STATES NATTONAI. MUSEUM. 



coarsely so laterally ; apex truncate in circular arc, finely and more or 

 less obsoletely beaded; sidea evenly and not strongly arcuate in 

 anterior three-fourths, thence convergent to the base, or more or less 

 arcuate from apex to base, as viewed vertically from above, more 

 broadly arcuate and just the least sinuate before the base as viewed 

 obliquely from the side, rather distinctly and finely beaded ; base 

 feebly rounded and more or less finely margined, a seventh to a fifth 

 wider than the apex; apical angles obtuse and not in the least promi- 

 nent anteriorly; basal angles obtuse. 



Elytra oval, widest at the middle, scarcely twice to one-fourth 

 longer than wide ; base truncate to feebly emarginate, scarcely to a 

 little wider than the contiguous prothoracic base; humeri obtuse; 

 sides evenly arcuate, apex not very narrowly rounded ; dv<c slightly 

 flattened and moderately convex on the dorsum, rather evenly and not 

 very broadly rounded at the sides, arcuately declivous posteriorly, 

 punctate, punctures rather fine and more or less irregular, usually 

 with a serial arrangement on the dorsum, interstitial punctures more 

 or less irregular, those of both series equal in size or the strial are 

 slightly large]-; both series always confused at the sides and on the 

 apex; not at all submuricate. 



Legs rather slender. 



Otherwise as in quadricollis. 



Male somewhat depressed. 



Female. — Convex and comparatively less elongate than in an- 

 thraciiia. 



Other secondar}' sexual characters as in quadricollis. 



Measurements. — Males: Length, 1(3-17 mm.; width, 6-7 mm. Fe- 

 males: Length, 16.5-17 mm.; width, 8-8.2 mm. 



Genital characters, male. — Sternite with each lobe more or less 

 parabolic in outline. Otherwise as in quadncoUis. 



Female. — As in quadnvollis^ except that the ventrolateral surface 

 is strongly convex at basal fourth and broadly concave before the 

 apex, setfe rather long internally. 



Habitat. — Arizona (Chiricahua Mountains, June, Hubbard and 

 Schwarz; Catalina Springs, April; Tucson.) 



Number of specimens studied, 9. 



Types (Cat. No. 12203) in the U. S. National Museum collection. 



Type-locality. — Chiricahua Mountains, Arizona. 



Salient type-characters. — (ilabrous and shining. Antennie reaching 

 beyond (male) or to (female) the base of the prothorax. Body in 

 the female less elongate than in quadricollis. Punctures on the epis- 

 toma not coarser than on the frons. Pronotum widest at the middle ; 

 disc finely and sparsely punctate, punctures not coarser nor denser 

 laterally. Elytra with the discal punctures arranged in series on the 



