1 84 MEMOIRS ON THE COLEOPTERA 



elytra oblong, rather abruptly obtuse behind, evidently wider than 

 the prothorax, slightly less than one-half longer than wide, the sinus 

 broad and distinct; striae deeply impressed, the intervals convex, 

 shining (cf), slightly opaculate (9), covered throughout, except 

 the sutural interval, with small and sparse but distinct punctures; 

 basal joint of the hind tarsi as long as the next two, but little longer 

 than the fifth. Length (cf 9 ) n. 0-11.8 mm.; width 4.2-4.7 mm. 

 Rhode Island to Indiana. [A. inter piinctatus Lee. nee Kirby]. 



nigrita Dej. 



9 Form and size nearly as in nigrita but with relatively narrower 

 head and prothorax, the head relatively slightly larger and with more 

 convex eyes, nearly three-fifths as wide as the prothorax, the foveae 

 more minute and punctiform but lying in feeble impressions, the 

 antennae nearly similar but sensibly more elongate; prothorax differ- 

 ing in outline, having more arcuate sides, straighter basally and widest 

 slightly before the middle, the basal angles with their tips more acute 

 and slightly prominent; surface similar throughout, except that the 

 foveae are a little deeper and not so diffuse and the stria not so deeply 

 impressed; elytra almost exactly as in nigrita buc relatively broader, 

 being fuUy a fourth wider than the prothorax, the intervals not so 

 evenly convex, being flatter externally and more convex suturally, 

 the fine punctuiet similar but not quite so close-set as in nigrita, the 

 tarsi similar. Length (9) 11.5 mm.; width 4.4 mm. New York. 

 [A. lecontei \\ Chd., and nigrita Lee. nee Dej.]. . . interpunctatus Kirby 

 Form and size somewhat as in melanopus but still stouter, very strongly 

 convex, the elytra highly polished, with very strongly convex inter- 

 vals and perfectly similar in the sexes; head nearly as in melanopus 

 but larger, more than half as wide as the prothorax, the latter differ- 

 ing very distinctly, being inflated anteriorly, with rather strongly 

 rounded sides, which are straighter basally and widest before the 

 middle as in the preceding, the obtuse basal angles more sharply 

 marked and usually minutely prominent at their tips, less transverse 

 than in melanopus, being but little more than two-fifths wider than 

 long, the surface similar, except that the latero-basal punctures are 

 finer, the stria subentire and rather deep though fine; elytra similar 

 but more broadly oval and usually subinflated, being widest a 

 little behind the middle, the sides more strongly arcuate; surface 

 with barely even a trace of fine punctuation at any part, the sub- 

 strial puncture but little behind the middle; in melanopus it is more 

 feeble and more posterior; hind tarsi subglabrous, the basal joint 

 slightly longer than the next two and much longer than the fifth. 

 Length (cf 9 ) 11.5-14.0 mm.; width 4.8-5.5 mm. Indiana, Illinois 

 and Tennessee. [A. striatus Lee. and paradox-us Hald.]. 



agricola Say 



10 Sides of the prothorax only feebly converging posteriorly and nearly 

 straight; alternate intervals of the elytra apically, and sometimes 

 almost throughout the length, finely and sparsely punctulate; 

 pronotum evidently punctured almost throughout its extent, densely 



and strongly so basally 1 1 



Sides of the prothorax rather strongly converging posteriorly and more 



