CEEAMBYCIDAE. 299 



The episterna of the metathorax in Oeme and Eucrossus are 

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

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

 color; with the elytra feebly punctured, clothed with erect 

 pubescence, 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 

 coxae being prominent, very strongly angulated externally, with 

 large trochantin ; the middle and hind coxae 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 Ganimus ; small and 

 truncate in Eucrossus. 



The genera may be distinguished as follows : 

 Palpi very unequal, dilated ; 



Prosternum laminiform ; antennae rough with elevated points ; mesos- 



ternum very narrow; 



Prothorax lobed at base. GANIMUS. 



Prothorax constricted at base. OBME. 



Prosternum not laminiform ; antennae very hairy beneath, joints 3-6 



with a terminal spine ; 



Body uniformly pubescent. ECCROSSUS. 



Body with transverse bands of yellow pubescence. DRYOBIUS. 



Palpi short, equal, slender; 



Front coxae contiguous, hardly prominent ; middle coxae distant. 



HAPLIDUS. 



The position of Dryobius is doubtful ; the eyes are almost 

 finely granulated, and the front coxal cavities much less angulated 

 externally, but the affinities seem to be stronger than with any 

 other group. The type and only species is Callidium sexfasci- 

 atum Say, a rare insect of the Mississippi valley. 



Haplidus is founded upon H. testaceus Lee., a slender finely 

 pubescent brown insect, without any striking characters ; it 

 occurs in California and Utah, and the affinities of it seem to me 

 also doubtful. 



* Ganimus vittatus resembles in form Oeme, and the antennae are 

 almost equally rough ; but the prothorax is not constricted behind, and 

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

 which it further agrees in having the middle coxae very large and nearly 

 contiguous, but differs by the palpi being very unequal. 



