220 COLEOPTERA OF NORTH AMERICA. 



dilated ; the front is dilated, concealing the labrum. The side 

 pieces of the metasternum are narrow; the 2d and 3d ventral 

 segments are scarcely emarginate. The legs are moderate, the 

 tibial spurs are small, and the tarsi are pubescent. 



Sub-Tribe II.— Cryptoglossini. 



Body oblong, with variable sculpture ; the epipleurse occupy 

 only a portion of the inflexed portion of the elytra, which is 

 wider than in the preceding sub-tribe ; the mentum is moderately 

 large, oval, and flat, in our genera, and the sides of the head are 

 not prolonged beneath ; the gular peduncle is distinct ; the last 

 joint of the palpi is slender or slightly dilated ; labrum almost 

 entirely concealed by the dilated front. The side pieces of the 

 metasternum are tolerably wide ; some of the ventral segments 

 are strongly emarginate behind. Legs long and stout, tibial 

 spurs not small, tarsi spinous beneath. 



Our genera belong to the group Centriopterse, distinguished 

 by the mesosternum being prominent. 



Mesosternum perpendicular in front ; last joint of antennae oval, acute, not 



smaller than the preceding. Centrioptera. 



Mesosternum broadly concave ; 

 Last joint of antennae oval, very little smaller than the 10th. 



Oochila. 

 Last joint of antennae truncate, one-half smaller than the 10th. 



Cryptoglossa. 



Centrioptera differs besides from the other genera by the hind 

 thighs being roughened with little teeth. The type of Oochila 

 is Asbolus ? infaustus Lee. from Texas ; Asbolus Lee. is synony- 

 mous with Cryptoglossa Sol. ; Centrioptera is found in California, 

 Cryptoglossa in Arizona and Utah. 



Tribe II.— ASIDIXI. 



Body ovate, apterous ; head scarcely narrowed behind the eyes, 

 which are transverse, reniform, and moderately finely granulated ; 

 epistoma very short, not covering the base of the mandibles; 

 labrum prominent ; mentum large, either filling entirely the gular 

 cavity or inserted upon a very short and wide peduncle, and thus 

 leaving the base of the maxillae exposed ; in either case a space 

 permits the lateral play of the palpi, the last joint of which is 

 large and securiform; antenna? (11-jointed in our genera) with 



