TENEBMONIDAE. 239 



transverse, emarginate, and coarsely granulated ; front dilated 

 at the sides, covering the base of the mandibles, truncate ante- 

 riorly,, separated from the prominent labrum by a short coria- 

 ceous clypeus ; antenna gradually thickened externally ; rnentum 

 small, trapezoidal, anterior portion coriaceous ; ligula prominent. 

 Flanks of prothorax separated by a margin from the back. 

 Elytra with narrow or moderate epipleuraa. Anterior coxse 

 rounded ; middle coxae with distinct trochantin ; hind coxse 

 sometimes widely, sometimes narrowly separated ; legs tolerably 

 long ; tibial spurs smaller in the second than in the first group ; 

 tarsi pubescent beneath ; the anterior and middle ones of the 

 male usually dilated. 



I have removed from this tribe, as constituted by Lacordaire, 

 the genus Apocrypha, which by the agglutination of the dorsal 

 and lateral pieces of the prothorax, seems well entitled to be 

 considered as a distinct tribe. The remaining genera are homo- 

 geneous in form and characters, and are divisible into two groups, 

 the first of which is allied to the Blaptini, but differ not only by 

 the more prominent ligula, but by the small coriaceous clypeus, 

 and narrow inflexed portion of the elytra ; the difference in the 

 vestiture of the tarsi is of less moment, as in some species the 

 hairs become in part so rigid as to simulate bristles or spines. 



Body hairy ; outer joints of antennae not compressed. Amphidora. 



Body glabrous ; outer joints of antennae compressed. Hslopes. 



Group I. — Amphidorae. 



Body oblong, rarely almost linear, clothed with long erect hair, 

 apterous ; mesosternum short ; hind coxa3 widely separated in 

 Cratidus and Amphidora, but less so in Stenotrichus ; outer joints 

 of the antenna? not compressed ; tarsi with the pubescence be- 

 neath very coarse, sometimes almost spinous. The epipleurae are 

 moderately broad and do not extend to the tip of the elytra. 



Outer joints of antennae subglobose ; 



First joint of bind tarsi a little longer than the 2d. Cratidus. 



First joint of hind tarsi as long as the 2d and 3d. Amphidora. 



Outer joints of antenna? subtriangular ; 1st joint of hind tarsi long. 



Stenotrichus. 



These genera arc known only from California ; Cratidus is 

 founded upon Amphidora osculans Lee. ; in it the anterior tarsi 

 of the male are not dilated, but the hind tibiae are armed with an 



