284 COLEOPTERA OF NORTH AMERICA. 



is strong]}^ constricted at base in Oeme, but in Ganiinus is trans- 

 verse, more rounded on tlie sides, and not constricted at base. 



The sculpture of the prothorax of the % in Eucrossus is pecu- 

 liar; finely alutaceous, opaque, with a smooth dorsal vitta, and a 

 large scar-like mark each side, nearly parallel with the dorsal 

 line, commencing near the base, suddenly inflexed just in front of 

 the middle, and then abbreviated. 



The episterna of the metathorax in Oeme and Eucrossus are 

 triangular, wide in front, and pointed behind, as in Criocephalus. 



The species E. villicornis is 18 mm. long, of a pale-brown 

 color; with the elytra feebly punctured, clothed with erect pubes- 

 cence, marked with two very faint lines, and armed with a small 

 subsutural spine at tip; the joints of the antennae from the 3d are 

 clothed beneath with a dense fringe of hair, becoming thinner to 

 the 8th, where it disappears.* 



The essential characters of this sub-group are in the front 

 coxiB being prominent, very strongly angulated externally, with 

 large trochantin; the middle and hind coxse are also prominent; 

 the 5th ventral of the % is as large as the 4th and emarginate at 

 tip in Oeme; equally large and truncate in Malacopterus ; small 

 and truncate in Eucrossus. 



The genera may be distinguished as follows: — 



Pali)i very unequal, dilated ; 



Prosternum laniiniform ; antennas rough with elevated points ; meso- 

 sternum very narrow ; 

 Prothorax lobed at base. Malacopterus. 



Prothorax constricted at base. Oeme. 



Prosternum not laniiniform; antennte very hairy beneath, joints 3— (J 

 with a terminal spine ; 

 Body uniformly pubescent. Eucrossus. 



Body with transverse bands of yellow pubescence. Dryobius. 



Palpi short, equal, slender ; 



Front coxffi contiguous, hardly prominent ; middle coxre distant. 



Haplidus. 



The position of Dryobius is doubtful ; the eyes are almost finely 

 granulated, and the front coxal cavities much less angulated ex- 



* Mnlarnptcrng rittafux resembles in form Oeme, and the antennae are almost 

 equally rough ; but the prothorax is not constricted beliind, and has a 

 broad basal lobe as described in the African genus Hypaeschrus, with 

 ■which it furtlier agr('<>s in having the middle coxae very large and nearly 

 contiguous, but differs by the palpi being very unequal. ■ Oanimus Zee. 

 is a synonym. 



