432 CASEY 



The latter tribe, it is true, includes a notable diversity, especially 

 of cephalic structure, but the genera have a certain commun- 

 ity of habitus which renders them very distinct from our much 

 smaller and more obscure forms. The general differential 

 characters of this and related tribes are sufficiently set forth in 

 the preceding table of tribes. The genera of Triorophini 

 within our faunal limits are the followinor : — 



Epistomal lobe parallel, very prominent, angulate at apex, clasped 

 toward base by the swollen basal parts of the mandibles, the 

 latter stout, each with a strong porrect dorsal tooth clasping the 

 labrum, the right tooth the larger, their apex very unequally bifid, 

 the lower lobe small, the upper larger and acute, becoming ob- 

 tuse or truncate, their broad outer surface toward base not im- 

 pressed ; eyes transverse, emarginate anteriorly; prothorax mar- 

 gined at the sides; elytra inflated, with abbreviated series of 

 coarse punctures, the epipleurae narrow, equal throughout; legs 

 long, the tarsi with sparse spinules beneath. [Type T. Icevis 

 Lee] Triorophus ^'^/| 



Epistomal lobe shorter and wider, broadly angulate, clasped by the 

 upper ridge of the mandibles when closed, the latter more feebly 

 dentate above 2 



2 — Epistomal lobe not deflexed 3 



Epistomal lobe strongly deflexed, the line forming the upper mar- 

 gin of the deflexed portion continuous with the sides of the 

 front when viewed from above; elytra oblong-oval, nearly as in 

 Triphalus S 



3 — Tarsi spinose or with sparse spiniform hairs beneath, not pubes- 



cent; elytra strongly inflated, subglobose 4 



Tarsi with long, coarse and dense, pale and conspicuous hairy vesti- 

 ture beneath ; body more cylindrical, the elytra less strongly in- 

 flated and more oblong-oval 7 



4 — Eyes not emarginate anteriorly 5 



Eyes more transverse, emarginated anteriorly by the lateral canthus...6 



5 — Body glabrous, small in size; mandibles acutely bifid at tip, the 



lobes unequal, both acutely rounded ; epipleurae intruded upon 

 and narrowed anteriorly by the met-episterna ; elytra with more 

 or less confused punctuation. [Type Stibia ovipennis Horn] . 



Micromes ^f 

 Body strongly pubescent, small in size : mandibles broader and squarely 

 truncate at tip; epipleurcE narrow but subequal in width through- 

 out, the met-episterna narrow ; elytra with strongly marked, 

 regular and entire series of punctures. [Type T. seriatusw. %-^.^. 



Trichiotes ^^J 



6 — Body rather small, conspicuously pubescent; elytra with more or 



less confused punctuation ; mandibles abruptly narrow beyond 



