142 MEMOIRS ON THE COLEOPTERA 



form lines which is most distinct, the outer being as nearly as 

 possible obsolete; subcostatus was defined wholly from the hind 

 body, as the anterior parts were missing in the original type, which 

 was found by the Mexican Boundary Commission. 



In rusticus of the above table, the small sparse elytral punctures 

 have just a suspicion of lineal arrangement on some parts of the 

 surface. In one example of brevimargo there occurs a singular 

 deformity, the right hind leg being but slightly longer than the inter- 

 mediate, while the left hind leg is very much longer as is normally 

 the case throughout the genus. To the left of the middle of the 

 hind margin of the fourth ventral in the type of subcruentus, there 

 is a fine porrect tooth projecting from the margin and bristling 

 with erect setae. The hind coxae in this type are unusually narrowly 

 separated, scarcely more than half as widely as the middle coxae, 

 while in the second specimen, which is also a male and having less 

 elongate, rather less convex and less strongly margined elytra, 

 the hind coxae are notably more widely separated, only a very little 

 less so than the intermediate; this is one of the most pronounced 

 structural inconsistencies that I have observed, and, if constant, 

 would imply two remarkably distinct species in spite of the general 

 similarity of facies of the only two specimens now at hand. 



Group II Type blapsoides Sol. 



This group is more properly Mexican and in those regions abounds 

 in species and subspecies; it is however represented in this country 

 by several aberrant species, forming two distinct sections, the first 

 of which as arranged below by its general appearance and, especially, 

 its coarsely and transversely rugose pronotal sides, recalls the 

 marginatus group very forcibly; it is however well distinguished 

 by the very convex and more cylindrical elytra. 



Prothorax angulate at the sides medially 2 



Prothorax regularly and rather strongly rounded at the sides 3 



2 Body rather narrow and subparallel, deep black throughout and 

 strongly alutaceous; head moderately impressed transversely, 

 strongly, rather sparsely but not very closely punctate, the inter- 

 spaces with other punctures which are very minute; antennae well 

 developed, rather longer than the prothorax, bristling with stiff 

 spinules, gradually moderately enlarged and compressed through 

 joints eight to ten; prothorax two-fifths wider than long, fully four- 

 fifths as wide as the elytra, the apex but slightly narrower than the 



