NORTH AMERICAN COLBOPTERA. 223 



equal in length, the latter slightly transverse. Prothorax widest at one- 

 fourth its length from the apex, where it is scarcely as wide as the head, one- 

 fourth longer than wide; anterior angles very narrowly rounded, decidedly 

 prominent; sides thence strongly convergent and feebly sinuate to the neck, 

 which is not excessively narrow, and distinctly convergent and very feebly 

 arcuate to the base which is trausverselj' truncate in the middle, two-thirds 

 as wide as the disk; angles somewhat narrowly rounded; disk transversely 

 and feebly convex, very minutely reticulate or subrugulose; excessively, 

 minutely punctate; punctures finer and more sparse than those of the 

 head, with a very narrow indistinct median impunctate line, and, toward 

 base a very feeble median carina which is finely striate along its crest. 

 Elytra at base very slightly wider than the pronotum; sides nearly par- 

 allel, feebly arcuate; together very feebly and broadly emarginate behind; 

 disk distinctly longer than wide, one-fifth longer than the prothorax; feebly 

 convex, broadly and feebly impressed along the suture, extremely minutely, 

 evenly and rather densely punctate. Abdomen very slightly narrower toward 

 base, feebly convex, very minutely and densely punctate. Anterior femora 

 nearly twice as robust as the intermediate, abruptly and deeplj'- sinuate on 

 the inner edge near the apex; tarsi very feeblj'- dilated, finelj^ and densely 

 pubescent beneath. Length 2.3 mm. 



Texas; (Austin 5). , 



The anterior tibiae of the male exhibit verj striking char- 

 acters; they are distinctly dilated and have along the flat- 

 tened interior face six parallel, oblique rows oi short, 

 inclined set^e, the rows becoming shorter toward the apex. 

 The four posterior femora are distinctly compressed and 

 arcuately bent. The male has the sixth segment broadly 

 sinuate at apex, the sinus being four or five times as wide 

 as deep and rather narrowly rounded, the sides being very 

 gradually recurved; from beneath the sinuation, and appar- 

 ently attached to the seventh segment, there protrudes a 

 robust ligala, slightly longer than wdde, strongly convex on 

 its lower face, abruptly constricted at base, squarely trunc- 

 ate at apex, with the angles not- rounded; the upper face is 

 broadly concave, serving as a rest and guide for the male 

 generative organ; the latter in the present species is very 

 complex, being cylindrical, with two unequal lateral pro- 

 cesses, anoulate on the right and broadly rounded on the 

 left. 



