292 COLEOPTERA OF NORTH AMERICA. 



6. Scutellum acutely triangular ; elytra not sinuate ; 



Front coxal cavities closed behind. IX. CALLICHROMINI. 

 Front coxal cavities open. X. TRACHYDEKINI. 



c. Scutellum rounded, or broadly triangular (Cyllene) ; tibial 



spurs large; thorax never tuberculated, nor spinose; 



elytra not sinuate ; 



Tibiae carinated. XI. STENOSPHENINI. 



Tibiae not carinated. XII. CLYTINI. 



d. Scutellum broadly rounded; thorax not tuberculate nor 



spinose ; sides of elytra deeply sinuate near the humeri. 



XIII. AGALLISSINI. 



III. Base of antennae partly enveloped by the eyes, which are nearly 



divided, and moderately finely granulated; 2d joint of antennas 

 longer than usual ; front 00x33 globose, widely separated ; stridu- 

 lating plate of mesonotum divided by a smooth furrow. (Body 

 resembling a Lamiide.) ATIMIOIDES. 



XIV. ATIMIIXI. 



IV. Base of antennae not enveloped by the eyes, which are entire or 



emarginate, and usually finely granulated ; front coxae conical 

 except in Disteniini) ; stridulating plate of mesonotum divided 

 by a smooth space or furrow. LEPTUROIDES. 



A. Mandibles scalpriform, not fringed. . XV. DISTENIINI. 



B. Mandibles simple, not fringed. XVI. DESMOCERINI. 



C. Mandibles acute, fringed on the inner margin. 



Elytra abbreviated. XVII. NECTDALINI. 

 Elytra not abbreviated ; 



Front nearly vertical. XVIII. ENCYCLOPINI. 



Front oblique or horizontal. XIX. LEPTUKIM. 



Tribe I. ASEmffl. 



This series contains the genera in which the ligula is corneous, 

 with the supports of the labial palpi fixed and connate, not 

 retractile ; the eyes are usually coarsely granulated, but some- 

 times (Asemum, Tetropium, and Opsimus) the granulation is 

 very fine ; the antennae are sometimes short, sometimes long, 

 densely punctured and pubescent, and do not usually have any 

 well-defined sensitive spaces, the 2d joint is always half as long 

 as the 3d, and the llth is simple ; the front coxae are generally 

 transverse and angulated externally, with distinct trochantin, 

 and the cavities are always open behind ; the middle coxal cavi- 

 ties open externally ; the side pieces of the mesosternum do not 

 intervene between the sterna; the mesosternum is bent down 

 behind but not acutely emarginate for the reception of the inter- 



