470 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Ventrolateral surfaces. — Body with surface . lines straight when 

 viewed longitudinally, quite evenly convex from side to side, smooth 

 and shining. Submarginal groove rather small beneath the external 

 border of dorsal plate, which is feebly explanate in apical half, termi- 

 nating at the apical margin. Internal margins of the valves con- 

 tiguous in basal four-fifths; fissure quite short, nearly closed, mar- 

 gins finely setose. Inferior membrane not visible. 



Ilahitat. — Wyoming (Cheyenne, June, Hubbard and Schwarz; 

 April, H. Soltau) ; Colorado (Salida, Fort Collins, Clear Creek, 

 South Park Region, San Luis Yalle}', H. F. Wickham) ; New Mexico 

 (Deming, Juh^ and August, Hubbard and Schwarz; Las Vegas. 

 August, Barber and Schwarz; Coolidge, Wickham) ; Arizona (George 

 Horn; Winslow, Hubbard and Schwarz; Santa Rita Mountains, 

 July, LIubbard and Schwarz; Tucson, Charles Fuchs) ; Kansas (F. H. 

 Snow; George Horn). 



Number of specimens studied, 48. 



Type in the LeConte collection. 



Type-localitij. — Fort Laramie and Santa Fe, New Mexico. 



Salient tyfe-cliaracters. — Opaque. Thorax with deeply emargi- 

 nate apex, margin broadly explanate, moderately reflexed, apical 

 angles subacute, basal angles broadly obtuse. Elytra with the dorsum 

 plane, acutely margined at aj^ex, margin reflexed, strongly so, seri- 

 ately, finely and rather densely nuiricato-punctate. Male with elytral 

 apices briefly prolonged (LeConte). 



Diagnostic cliaracteTS. — In this species the thorax proper is broader, 

 the prothoracic margins are moderately foliaceous and reflexed, the 

 integuments are more or less opaque, finely and subasperately sculp- 

 tured, the elytral margins attain the apex. The males are briefly 

 caudate. 



From 7nuricatunh it differs by not having the basal angles of the 

 prothorax prolonged backward over the humeri. The elytral margin 

 is thinner, narrower, and usually scarceh' reflexed unless it be near 

 the humeri. The sides of the pronotum are rounded from apex to 

 base and not l)i-oader behind, the basal angles are broadly rounded 

 and slightly more ])roniinent posteriorly than the middle of the base. 



In coritusuni the nuiles have the inferior surface of the elytral cauda 

 form by the dilated apices of the epipleural surface. 



From (jldbnnn it is recognized b}^ the dull luster and finely sub- 

 asperate sculpturing, also by the acute elytral margins attaining the 

 apex. 



In the U. S. National Museum collection there are two males and 

 two females which were collected in New Mexico. They are the 

 largest and most strongly developed specimens that I have seen. The 

 elytral apices are distinctly caudate, and the elytral disc quite evenly 

 concave transversely in the males and the suture is feebly raised 



