AMERICAN COMPONENTS OF THE TENTYRIIN^ 279 



10 — Metastenium with oblique grooves homologous with the trans- 

 verse ante-coxal grooves of preceding tribes ; epipleura^ very wide, 

 occupying virtually the entire inflexed sides of the elytra ; scu- 

 tellum wholly invisible ; mentum hexagonal, sinuate at tip; an- 

 tennas slender; mandibles generally bifid at tip, folding under 

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

 greatly developed; body oval, apterous *Zophosini 



Metastei'num with very fine abbreviated transverse grooves, short, the 

 body wingless, oval in form; epipleurae narrow, entii'e 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, epipleurse and tip of the 

 mandibles as in Capnisini ; antenn£e 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, epipleurae and tip of the mandi- 

 bles as in Gnathosiini; antennae 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 </3 / 



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

 plane against the apex of the flattened prosternal process; hind 

 coxas 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 



12 — 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; antennaj slender; scu- 

 tellum invisible ; epipleurae 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 *y <^ ? 



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; epipleurie entire but 

 very variable in form ; metasternum extremely short, much 



