88 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



arranged without trace of order, nearly ahva3'S so laterally and on 

 the apical declivity, where they are scarcely ever subasperate. 



Otherwise as in quadncollis. 



Male. — Antennae reaching a short distance beyond the base of the 

 prothorax. Pronotum usually widest at the middle. 



Female. — Antennae reaching to the base of the prothorax. Prono- 

 tum not usually very noticeably widest before the middle. 



Otherwise the sexual characters are as in quadricollis. 



Measurements. — Males: Length, 18-19.5 mm.; Avidth, 6.5-7.5 mm. 

 Females : Length, 18-22 mm. ; width, 7.5-10.5 mm. 



Genital characters.! male. — Edeagophore flaxseed-shaped and mod- 

 erately arched. 



Basale oblong, quite evenly convex above ; sides slightly arcuate. 



Apicale triangular and moderately elongate; surface moderately 

 and evenly convex, w4th a median semimembraneous groove in apical 

 half; sides nearly straight, apex subacute; base rather broadly and 

 arcuately lobed at the middle, and slightly sinuate laterally. 



Sternite parabolic in outline and slightly transverse. Each lobe 

 Avith the external border quite evenly arcuate to apex, the latter nar- 

 rowly rounded; internal border short and nearly straight; surface 

 feebly convex, impunctate in basal half, sparsely punctate apically, 

 setose, setae moderate in length, longer about the apex, not dense. 

 Membrane sparsely setose across the bottom of the sinus, the latter 

 short. 



Female. — Genital segment quite quadrate, explanate externally in 

 apical two-thirds. 



Valvula. — Dorsal plate oblong, moderate in width, sides subpar- 

 allel; surface quite plane, glabrous, coarsely and sparsely punctate, 

 each puncture with a moderately long reclining seta, impunctate at 

 base; external l)order more or less straight to feebly arcuate to the 

 apical border, which is strongly rounded on the external lobe and 

 slightly sinuate just external to the minute internal lobe; external 

 lobe about as wide as the dorsal plate, both lobes sparsely set with 

 long seta^ ; internal margin more or less sinuous. 



Appendage not visible from above, short mammilliform and 

 scarcely projecting beyond the margins of the fossa. 



Basal prominences scarcely evident. 



Superior pudendal membrane longitudinally rugulose, reaching to 

 the internal lobe. 



Ventrolateral surface as in quadricollis. 



Habitat. — Arizona (Fort Grant, July 10; Hot Springs, June; 

 Oracle, San Simon, Galiuro Mountains, May; Catalina Springs, 

 April; Tucson. Hubbard and Schwarz; Nogales, September, Albert 

 Koebele and F. W. Nunenmacher). 



