188 AMERICAN COLEOPTERA. 



much out of place. The only specimen of macrocerus at 

 hand has a distinctly longer anterior tooth and two denticles 

 and would naturally be referred to Group VII. 



Schaeffer remarks that he has observed in both macrocerus 

 and compressicornis that the anterior denticle is sometimes 

 longer than the others, and I think there is little doubt that 

 these two species would be more appropriately grouped with 

 the species having a tooth and two denticles, though their 

 antennal characters are such as to make them exceptional in 

 that series. Seminulum and atormis on the other hand though 

 more decidedly separated from Group VII by their femoral 

 denticles are really closely allied to some of the smaller 

 species of that group, small specimens of atireolus being, in- 

 deed, very similar to seminulum. 



Antennae longer than the entire body, serrate, all the joints except the 

 second elongate, black, sparsely irregularly clothed with 

 white pubescence. (New Jersey, District of Columbia, 



Tennessee.) macrocerus Schf. 



Antennae passing the middle of the elytra, scarcely serrate, outer joints 

 quadrate or transverse; black, more densely and uniformly 

 pubescent. (Brownsville, Texas. )..compressieorni!S Schf. 

 Antennas not or but slightly passing the base of the prothorax. 



Legs and antennas entirely yellow ; pubescence of upper surface 

 uniform, spur of hind tibia short. (Brownsville, Texas ; 



Lower California.) flavieoniis Sharp. 



Legs and antennae black ; pubescence more or less distinctly marmo- 

 rate on the elytra with small subdenuded spots. 

 Coarse punctures of the pronotum very obvious, spur of hind tibia 

 about one-fourth as long as the first tarsal joint. (Florida, 



Kansas.)..... seminulum Horn. 



Coarse punctures nearly wanting on the pronotum ; spur of hind 

 tibia two-fifths as long as the first tarsal joint. (Massa- 

 chusetts, New York.) atomus n. sp. 



IS. atomns n. sp. 



Form rather stout, entirely black, rather thinly and unevenly clothed 

 with cinereous pubescence, producing a finely marmorate effect, espe- 

 cially on the elytra ; punctuation throughout very fine, sparse and 

 indistinct. Eyes moderately prominent, separated by a distance which 

 slightly exceeds their own width. Front not in the least carinate. 

 Antennas rather short, moderately incrassate, joints 6-10 transverse. 

 Prothorax moderately transverse, sides feebly arcuate. Elytra about 

 as wide as long, a little wider behind. Pygidium subvertical. Hind 



