204 BULLETIN 6.S, UNITED STATES NATIONAL MUSEUM. 



Type in the LeConte collection. 



Type-locality. — Ringgold Barracks, Texas. 



Salient type-cTiaracters. — Thorax Avith the disc slightly convex, 

 sides broadly depressed and slightly reflexed, sides greatly rounded, 

 siibsiniiate behind ; anterior angles acutely acuminate ; basal angles 

 rectangular. Elytra with dorsum plane, sides parallel and margined 

 (LeConte). 



Diagnostic characters. — Conspicuous among its congeners by the 

 acute and more or less reflexed elytral margins, with the pronotal 

 margins acute and reflexed and the disc concave. 



The typical race is less elongate with the elytral margins distinctly 

 arcuate; var. texana differs in its elongate and parallel form. 



The form is quite constant in this species. The mentum is of 

 moderate size and subtrapezoidal in form; frequently more or less 

 arcuate anteriorly, at other times the sides are straight, converging 

 anteriorly and the apex more or less truncate, often the apex is 

 rounded and narrowly inflexed, giving it a truncated appearance: 

 the surface is scarcely convex, coarsely punctured, more or less even 

 or ridged along the middle, feebly and broadly foveate laterally 

 and setose, setfe short, scarcely dense and less conspicuous than in 

 the other species of the group. 



Prosternum very variable and as in acuta. In the more strongly 

 developed exam^^les of texana., the intercoxal prosternal surface is 

 slightly oblique, downward and backward so that the posterior 

 angle is prominent and subacutangular to the strongly truncate and 

 vertical posterior edge. 



In the smaller specimens of sutuimlis the prosternum is strongly 

 convex antero-posteriorly. 



The mesosternum is variable as in acuta. The .abdominal inter- 

 coxal process is nearly quadrate, its Avidth is equal to the length of 

 the third segment; the second segment is about equal to the post- 

 coxal portion of the first, and twice as long as the fourth; in texana 

 it is a little longer ; the third is about one-fourth of its length shorter 

 than the second segment. 



The abdominal salient is about one-sixth of its width wider than 

 the metasternal process (males) or subequal (females). 



The metasternum laterally between the coxte is about as long as 

 the width of ainesotibia at apex. 



The tibial grooves of the profemora are nearly entire, their sides 

 are well defined and the floors are glabrous; the anterior margin of 

 each is dentately laminate at about the outer fourth, it may be simi)ly 

 sinuate. 



The grooves of the meso- and metafemora are poorly defined and 

 short, scarcely ever extending beyond the middle and generally only 



