TENEBRIONIDAE. 217 



large, lunate, filling the gular cavity, and covering the base of the 

 maxillae, ligula prominent ; antennae 10-jointed, thick, joints 

 rounded, equal ; anterior coxae contiguous, their cavities conflu- 

 ent, though closed behind ;* middle coxae without trochantin, 

 entirely inclosed by the sterna ; hind coxae widely separated, 

 intercoxal process of the abdomen obtuse, first ventral segment 

 elongated ; elytra embracing but slightly the flanks of the abdomen, 

 epipleurae narrow. Legs moderately short, tibial spurs scarcely 

 distinct, tarsi pubescent. Side pieces of metasternum very narrow. 

 The elytra are shining and coarsely punctured, the thorax 

 elongated, constricted at the middle, with a convex lateral tu- 

 bercle just in the constriction. 



Tribe VIIL— STENOSINI. 



Body slender, apterous ; head constricted behind into a neck ; 

 labrum covered by the epistoma ; mentum large, inserted upon a 

 gular peduncle ; maxillae exposed, ligula slightly prominent ; eyes 

 variable in form, coarsely granulated ; antennae 11 -jointed ; elytra 

 embracing but slightly the flanks of the abdomen ; anterior coxae 

 moderately separated ; middle coxae without trochantin, inclosed 

 by the sterna ; hind coxae moderately distant ; legs feeble, tibial 

 spurs obsolete, tarsi ciliate. Side pieces of metasternum narrow. 



Of this tribe but a single representative Arseoschizus costipen- 

 nis Lee, is known from our territory ; it is found on the borders 

 of the Colorado Desert. 



Araeoschizus is distinguished from foreign genera by the eyes 

 being not divided, but very small and linear, situated on the upper 

 surface of the head, between the margin and an elevated line ; 

 by the 11th joint of the thick antennae, being small and partly 

 received by the 10th ; and by the thorax being long and feebly 

 convex, not costate on the disk. 



Tribe IX.— APOCRYPHI3VI. 



Body slender, apterous ; head not constricted behind ; labrum 

 prominent ; eyes small, emarginate, coarsely granulated ; mentum 

 small, inserted upon a gular peduncle ; maxillae and ligula ex- 

 posed ; last joint of palpi strongly securiform ; antennae 11-jointed, 

 slender, scarcely thickened externally ; prothorax globose, flanks 

 not separated from the sides ; trunk pedunculated ; elytra em- 



* This character is known in no other Tenebrionide. 



