118 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



ately sinuate to tip; apex feebly attenuate and subacute; base with 

 a rounded lobe at middle third, feebly and broadly sinuate laterally. 



Sternite quadrato-parabolic. each lobe with the outer border 

 straight and more or less obliquely truncate apically, angle nar- 

 rowl}^ rounded ; internal border straight ; surface feebly convex, 

 sparsely punctate and setose, setse moderately long about apex and 

 not dense. 



Female. — Genital segment subequilalerally triangulo-parabolic, 

 rather short and setose. 



Yalvula{Y\A\.(i 4, fig. 25). — Dorsal plate oval-oblong, distinctly con- 

 cave; surface glabous and shining, sparsely punctate, each puncture 

 with a long seta, internal moiet}^ in apical half impunctate and more 

 or less reflexed, outwardly also somewhat reflexed; external border 

 evenly arcuate, angle broadly rounded ; apical margin oblique pass- 

 ing onto the apex, the latter triangular, acute and rather slender; 

 angle and apex clothed with quite long flying hairs ; internal border 

 arcuate apically, sinuate toward base. 



Appendage conical to depresso-conical, moderate in size with a 

 tuft of rather long hairs. Fossa transverse. 



Basal prominenees not evident. 



Superior pudendal membrane scarcely to feebly and distantly longi- 

 tudinally rugulose, reaching to about the middle of the dorsal plate, 

 opaque; valvular membrane closing the intervalvular cleft apically. 



Ventrolateral surface. — Body moderately convex at base and more 

 or less transversely concave before the apex ; submarginal groove fine. 

 Margins of the fossa not fringed with hairs. Apex appears sub- 

 laminate with the internal angle of the fossa. 



Internal margins of the valves contiguous, genital fissure very nar- 

 row and closed. Inferior pudendal membrane not visible. 



Habitat. — Arizona (Casey; H. K. Morrison; Chiricahua ]Moun- 

 tains, July, Foi't (Irant. July, Santa Eita "Mountains. May. all in the 

 collection of Hubbard and Schwarz; Santa Rita Mountains, 5,000- 

 8,000 feet, June, F. H. Snow). 



Number of specimens studied. 24. 



Type is in the collection of Col. Thomas Casey. 



Type-locality. — Arizona. 



Salient type-characters. — Form, robust; shining and glabrous, very 

 finely sculptured. 



Interocular surface broadly and evenly convex; between the eyes 

 the punctures are very fine and irregularly scattered, gradually 

 increasing in size and density anteriorly; on the epistoma they are 

 very close and much larger. 



Prothorax with base one-fourth longer than the apex; sides stromrly 

 and nearly evenly arcuate, most strongly so just in advance of the 



