NORTH AMERICAN COLEOPTERA. 61 



punctate at middle, with a few coarser punctures intermixed at sides. Elytra as 

 wide at base as the thorax, humeri distinct, but obtuse ; sides parallel, disc very 

 finely striate, striae scarcely visible, punctate, intervals flat, rather coarsely and 

 closely biseriately punctate, each puncture bearing a short pale hair, elytral mar- 

 gin with short fimbrije. Mesosternum finely alutaceous, opaque. Metasternum 

 and abdomen sparsely punctate. Anterior tibia? smooth in front, tridentate ex- 

 ternally, crenate above, the first tarsal joint longer than the second. Posterior 

 femora sparsely finely punctate, posterior tibia? rather stout, first tarsal joint not 

 quite as long as the next three. Length .Ifi inch , 4 mm. 



In the nine specimens examined there have been no sexual differ- 

 ences observed. 



This species is remarkable in the very fine scarcely punctured 

 elytral stri« with the intervals very conspicuously biseriately punc- 

 tate. 



Occurs in southwestern Texas. 



Group M. 



Scutellum small. Head not tuberculate, clypeus broadly emar- 

 ginate, bidenticulate in oblongus. Mesosternum, at most, feebly cari- 

 nate between the cox^e. Thorax broader in front than posteriorly, 

 the hind angles apparently obliquely truncate. Elytra nari-ower at 

 base than at middle, the humeral angles dentiform. 



In this group I have united the species formerly separated into 

 groups N and O, as there does not seem to be any special reason for 

 retaining them apart. In describing the species the base of the tho- 

 rax is called "oblique each side near the hind angles," wliile in tlu' 

 above general characters the hind angles are said to be " obliquely 

 truncate." The meaning is really the same, although some might be 

 disposed to consider the oblique portion a part of the base, others of 

 the side of the thorax. 



The species are thus separable : 



Elytra oblong : mesosternum obsoletely carinate. 



ClMJeus feebly emarginate, a small acute tooth each side obloiitfUS. 



Clypeus feebly emarginate, angles broadly rounded sparsiis. 



Elytra oval ; clyixnis feebly emarginate with rounded angles. 



Thorax with nunu>rous coarse and deep punctures ; elytral striiv fine, but deep ; 



punctures fine 



.ovipeniiiM. 



Thorax with very few coarse punctures; elytral stria- fine with ,ous,.i,u„usly 

 large and distant punctures Iiiiiiioralis. 



A. obloiiSU!^ Sav. -Oblong, moderately elongate, slightly l.roader poste- 

 riori*- piccus black, shining, legs brownish. Antenna brown, club darker. Head 

 moderatelv convex, front without tra.v of tubercles, surface sparsely, rather 



