TENEBRIONID/E 195 



These costules are sometimes feebly traceable also in the quadri- 

 collis group, but they never appear in the opaca group, where the 

 basal angles of the prothorax assume a different form, being ob- 

 liquely prominent and acute. It is apparent, however, that the 

 quadricollis and polita groups are better considered a section of 

 Asidopsis, having as its type opaca, than as a part of Trichiasida. 

 These three costules moreover, arranged as stated, appear also in 

 very visible form in the puncticollis group of Euschides and elsewhere, 

 and in fact characterize a large part of the American Asidini, so 

 that they alone are not of any great weight in determining the 

 limits of individual genera. 



Group III Type mancipata Horn. 



Not having a representative of mancipata at hand, it is imprac- 

 ticable for me to give any useful information concerning this group, 

 of which I can only repeat the few characters published by Dr. Horn. 



Body as in opaca in form; head and prothorax opaque, the elytra more 

 shining; head sparsely and rather finely punctate and with a few 

 scales; prothorax broader than long, the apex slightly narrower than 

 the base and sinuate, the sides moderately arcuate, sinuate before 

 the basal angles, which are acute and moderately prominent; sur- 

 face feebly convex, coarsely and rather densely punctured and 

 opaque, the sides moderately reflexed; elytra oval, more rapidly 

 narrowed at apical third, at base slightly broader than the prothorax, 

 the margin acute and entire, slightly reflexed at the humeri, which 

 are moderately prominent; surface feebly convex and with three 

 irregular and feebly elevated costae, united by intervening reticu- 

 lations; under surface feebly shining, finely rugulose and subpunctate. 

 Length 13.0-16.0 mm. New Mexico (Grant Co.). [Asida 

 mancipata Horn] mancipata Horn 



In the remarks following the original description it is stated that 

 the male is more slender than the female, with the elytra feebly 

 convex, the female stouter, with the elytra more convex but de- 

 pressed along the suture. 



Group IV- -Type opaca Say. 



This group is more diversified in habitus and structure than the 

 polita group, though perhaps somewhat less so than the quadricollis 

 group. The body is densely opaque, and lustreless in the great 

 majority of species, but in at least one is strongly shining, and the 

 side margins of the elytra are by no means constant. The opaca 



