AMERICAN COMPONENTS OF THE TENTYRIIN^ 28 1 



smaller ligula entirely exposed, the labial palpi distinct; tarsi and 

 scutelluin variable; mandibles bitld at tip; body oblong, de- 

 pressed, very roughly and densely sculptured Nosodermini 



Eves coarsely faceteil, more rounded ; antennie received in dorsal 

 cavities, short and stout, the last three joints free, dilated, form- 

 ing a very compact 3-jointed club; mentum, ligula, mandibles, 

 labial palpi and form and rough sculpture of the body nearly as 

 in Nosodermini; scutellum very minute; body much smaller in 

 size Usechini 



1- — Scutellum obsolete; body elongate, the elytra more or less 

 inflated, costate ; mentum large, closely filling the buccal opening, 

 completely covering the maxillae but exposing the ligula in a 

 large apical sinuation; eyes very widely divided and coarsely 

 faceted * Adelostomini 



Scutellum extremely minute; body slender, with oval, inflated, 

 costulate elytra; mentum moderate, subquadrate, not iilling the 

 oral opening and not sinuate at tip ; eyes coarsely faceted, 

 narrowly divided Araeoschizini 



iS — Spurs of the anterior tibice minute or obsolete 19 



Spurs of the anterior tibiae longer and distinct 22 



19 — Antennae thick, subfiliform, moderate in length and perfoliate 



as in the two preceding tribes 20 



Antennae very small, slender and compact; anterior coxae separated; 



body glabrous 3 1 



zo — Anterior coxae separated as usual; body elongate, convex, 

 glabrous, the scutellum visible and sometimes large, the elytra 

 not costulate; eyes coarsely faceted; mentum moderate, sub- 

 quadrate, not filling the oral opening or covering the maxilke. 



* Stenosini 

 Anterior coxce contiguous; body slender, depressed, glabrous, the 

 scutellum very minute, rounded, the elytra not costulate, the 

 pronotum and front of the head remarkably excavated; eyes 

 coarsely faceted, wholly dorsal though on the deep sides of the 

 head; mentum transversely lunate, completely filling the semi- 

 circular oral cavity, covering the maxillae, the apex sinuate and 

 exposing the ligula Dacoderini 



21 — Antennae enlarged distal ly, received in a deep cephalic groove 

 continued into the propleur^ ; mentum moderate, slightly trans- 

 verse, concave, covering the ligula and to a 'slight extent, the 

 maxillae, the sides of the oral opening acute and prominent; 

 maxillary palpi small and slender, the last joint very narrowly 

 oval, obtusely pointed; eyes wholly dorsal and far from the 

 margin of the head, extremely minute; body narrow, elongate, 

 subparallel, convex, the scutellum small but distinct, triangular; 

 pronotum depressed at base Typhlusechini 



Antennae not enlarged distally, very compact, cylindric, free ; 

 mentum moderate, subquadrate, wholly exposing the maxillae; 

 Proc. Wash. Acad. Sci., August, 1907. 



