84 MEMOIRS ON THE COLEOPTERA 



In contortus the base and apex of the prothorax are equal in 

 width; in regularis the base is much wider, and in alveolatus cor- 

 respondingly narrower, than the apex. Contortus and alveolatus 

 have the same form of prothorax, this being very different in regu- 

 laris; but, in alveolatus, the hind body is more nearly as in regularis; 

 in the former the prosternal process differs markedly from the 

 porrect flattened form of either contortus or regularis, though, at 

 the same time, it is not declivous behind as in Pactostoma but 

 gradually becomes vertical on its posterior face. 



Stenosides Sol. 



Not having the type of this genus, the Mexican graciliformis , 

 before me at present, I am unable to make any original observation 

 concerning it. The diagnosis of Solier omits some characters that 

 would prove useful in estimating its degree of relationship with 

 A stratus, but some remarks of Lacordaire under his description of 

 Ologlyptus, which was apparently drawn mainly from graciliformis, 

 would seem to show that it is really more closely related to Astrotus 

 than to the species which I have assumed as the type of Ologlyptus 

 Lac., Asida anastomosis of Say, although the prosternum be- 

 tween the coxae, according to Lacordaire, more closely resembles 

 that of anastomosis. On the other hand, perhaps a too hasty 

 examination of graciliformis indicated a form of the process similar 

 to that described above under Astrotus alveolatus, which at first 

 sight might easily be pronounced identical with that characterizing 

 anastomosis and allied forms; but a closer examination shows that 

 it is really different in having its posterior wall truly vertical 

 toward the lower margin and not posteriorly sloping, being simply 

 a modification of the porrect prominent form typical of Astrotus. 

 It is sufficiently evident, at any rate, that Lacordaire united two 

 genera in his conception of Ologlyptus and that Stenosides should 

 be considered a valid generic group. 



I am inclined to place the following species in the genus Ste- 

 nosides: 



Blackish, covered with yellowish scales, rather elongate, somewhat 

 flattened above; head covered with yellowish scales, which com- 

 pletely conceal the sculpture; antennae much heavier than in Olo- 

 glyptus anastomosis; prothorax transverse, broadest at about the 

 middle, the surface convex, bifoveate, with a fine distinct median 



