AMERICAN COLEOPTERA. 79 



known in the genus as regards the number of antennal joints, 

 viz.: nine instead of ten. The fact is of no great moment, 

 however, and considering the variation in this respect in 

 certain nearby genera, e. g. Lachnosterna and Dichelonycha, the 

 surprise is rather that there should be such uniformity in so 

 large a genus. The species is rather a remarkable one in 

 several other particulars, notably in the peculiar and variable 

 supra-orbital impressions. In one example these impressions 

 are double and occupy the greater part of the vertex and 

 occiput, approaching so closely as to leave only a longitudinal 

 median carina between them ; in another example the anterior 

 margin of the thorax is broadly impressed each side instead 

 of the head. The acute hind angles of the thorax is a very 

 unusual character and the form of the mentum and position 

 of the ungual tooth are both exceptional in this part of the 

 genus. 



SO. D. harperi Blanch. 



Oblong, very little wider posteriorly, reddish-brown to blackish- 

 brown, surface polished, with at most but faint traces of alutaceous 

 sculpture on the elytra. Mental declivity short and not strongly 

 oblique, beginning at about the anterior third, summit feebly or mod- 

 erately margined; mentum flat posteriorly with more or less numerous 

 large shallow punctures. Clypeus usually broadly rounded from side 

 to side, rarely subtruncate or subsinuate at middle; clypeal suture 

 distinct, arcuate at middle; punctuation of head moderately dense, 

 but a little variable. Prothorax somewhat variable in form, usually 

 nearly twice as wide as long, sides very broadly arcuate and a little 

 convergent, the apex not much narrower than the base, punctuation 

 coarse, dense at sides, less so medially, basal margin strongly impressed 

 from side to side, the impressed line not or scarcely narrowed at middle. 

 Elytra rather more than three times as long as the prothorax, coarsely 

 quite densely punctate, less closely and coarsely at middle as usual. 

 Upper tooth of front tibias much nearer the apex than the base; thighs 

 rather slender; ungual tooth stout, obliquely truncate, nearly as long 

 as the superior portion of the claw, its tip twice as far from the base 

 as from the apex of the claw. Length 7-10 mm.; width 3.7-5.3 mm. 



An abundant and widely dispersed species, occurring from 

 New York to Florida and westward to Kansas and Texas. 

 There is a specimen from Utah in the Nat'l Museum collec- 

 tion. The following localities are represented in the material 



TRANS. AM. ENT. SOC, XXXV. MARCH, 1909. 



