AMERICAN COMPONENTS OF TIIJ-: TENTVRIlNVt: 279 



10 — Metasternum witli oblique grooves Iioinolofjous with the trans- 

 verse ante-coxal <2[rooves of preccdinj^ tribes ; epipleune very wide, 

 occiipyiii<4 virtually the entire inHexed sides of the elytra; scu- 

 telluiii wholly invisible; mcntuni hexaj^onal, sinuate at tip; an- 

 tennie slender; mandibles generally bifid at tip, folding under 

 the labruni, the frontal margin not greatly modified; tibial spurs 

 greatly developed; body oval, apterous *Zophosini 



Metasternum with very fine abbreviated transverse grooves, short, the 

 body wingless, oval in form; epipleuraj narrow, entire as usual; 

 eyes not prominent; scutellum invisible; mentum more trans- 

 verse, sinuate at tip; antennae slender; mandibles bifid at tip, 

 strongly toothed above and clasping the sides of the prolonged 

 epistoma ; tibial spurs short as usual *Capnisini 



Metasternum without grooves, short, the body oblong or elongate, 

 wingless; tibial spurs, mentum, eyes, epipleur^e and tip of the 

 mandibles as in Capnisini ; antennae very stout; front variable 

 in form; scutellum visible but small, always strongly angulate ; 

 elytra as in Capnisini, without punctured series, though some- 

 times with impressed lines *Gnathosiini 



Metasternum, tibial spurs, mentum, epipleurie and tip of the mandi- 

 bles as in Gnathosiini ; antennie very slender ; front variable in 

 form; scutellum distinct, always transverse and very obtusely 

 truncate, generally not entering between the elytra behind the 

 invariably pronounced basal margin ; eyes coarsely faceted ; body 

 elongate, wingless, the elytra oval, with punctured series. 



Triorophini 



II — Mesosternum elevated, flat, abutting closely and on the same 

 plane against the apex of the flattened prosternal process; hind 

 coxae transversely oval, only moderately abbreviated transversely. 



12 



Metasternum not elevated, discontinuous with the prosternum ; hind 

 coxae small, oval, very much abbreviated transversely; eyes finely 

 faceted ; legs long and slender 13 



13 — Body pilose, with broadly inflated elytra and narrower porrect 

 anterior parts, the front with a strong epistomal projection clasped 

 by the mandibles, which are bifid at tip; antennae slender; scu- 

 tellum invisible; epipleurie obliterated anteriorly from near the 

 base of the abdomen; metasternum longer than the first ventral ; 

 intercoxal process of the abdomen only moderately wide and 

 broadly rounded Edrotini 



Body broadly oval, glabrous and compact, the prothorax closely fitted 

 to the elytra throughout the basal width of the latter ; epistoma 

 sinuate, not produced ; mandibles small, folding beneath the la- 

 brum, deeply grooved externally but with the groove not attaining 

 the bifid apex, the lower margin externally very acutely ridged ; 

 antennae very stout; scutellum invisible; epipleurae entire but 

 very variable in form ; metasternum extremely short, much 



