330 COLEOPTERA OF NORTH AMERICA. 



to the same extent, but to be slightly moveable in nearly all, if not 

 all, the species. 



I would arrange the tribes represented in our fauna into series, 

 as follows : — 



I. Humeral angles not prominent ; metasternum short; wings wanting ; 

 front tibiae sulcate. DORCADIOIDES. 



A. Front large, palpi slender ; 



Support of labrum distinct, coriaceous. Dorcadiini. 



Support of labrum not visible. Monilemini. 



B. Front short, oblique, palpi dilated. Michthysomini. 

 II. Humeral angles distinct, wings perfect, elytra entire ; front tibiae 



sulcate ; 



A. Body small, elytra gibbous or spinose near the base; prothorax 



constricted behind, front large inflexed, ungues divergent. 



CYRTINOIDES. 

 Front coxal cavities rounded. Cyktinini. 



Front coxal cavities angulated. Psenocerini. 



B. Body elongated, usually large, elytra not gibbons ; scape of 



antennae with an apical cicatrix (except Dorcaschema), front 

 coxal cavities angulated, sometimes a little open behind ; eyes 

 rather finely granulated ; (ungues usually divaricate, but 

 variable). LAMIOIDES. 



MONOHAMMINI. 



C. Ungues divergent. 



a. Scape of antennae with an open apical cicatrix; front 



coxal cavities angulated, middle coxae open; eyes finely 

 granulated ; body broad. MESOSOIDES. 



Mesosini. 



b. Scape of antennae without cicatrix; front coxal cavities 



variable, middle coxae open. ONCIDEROIDES. 



Front large, flat ; front coxae angulated. Onciderini. 

 Front convex; front coxae nearly round; eyes very 



coarsely granulated. Ataxiini. 



Front inflexed, form very elongate. Hippopsini. 



D. Ungues divaricate ; scape of antennae without cicatrix ; 



a. Front coxae rounded, middle coxae closed or nearly so ; form 



usually stout. ACANTHODEROIDES. 



Scape of antennae clavate. Acanthoderini. 



Scape of antennae long, slender. Acanthocini. 



b. Front coxae angulated, middle coxae open. 



POGONOCHEROIDES. 

 Support of labrum coriaceous. Pogonocherini. 



Support of labrum not visible. Desmiphorixi. 



c. Front coxae protuberant, subcorneal, cavities angulated ; 



middle coxae open externally ; eyes very finely granu- 

 lated ; form cylindrical, prothorax never armed, rarely 

 tuberculate on the sides. SAPERDOIDES. 



