4G6 COLEOPTERA OF NORTH AMERICA. 



14. Ventral sutures more or less curved. 15. 

 Ventral sutures entirely straight. (p. 48.')) L^mosaccini. 



15. Humeri of elytra truncated by side pieces of mesothorax. 



(p. 494) Bakihi. 

 Humeri not truncated. l^- 



16. Beak received in or upon the breast. 17. 

 Beak not received in or upon the breast ; 



Prosternum continuous on the same jjlane with the niesosternum. 



(p. 483) Tkypetini. 

 Prosternum distant from the mesosternum. (p. 484) Derelomini. 



17. Eyes more or less covered in repose, except in the group Phytobii. 18. 

 Eyes not covered. l-^- 



18. Body oval, pygidium covered. (p. 486) Ceyptoruyncbini. 

 Body broad, ijygidium exposed. (p. 491) Ceutoehynchini. 



19. Antennaj geniculate, eyes very large. (p. 489) Zygopini. 

 Autenu3e straight. (p- 490) Tachygonini. 



Tribe I.— PHYTORTOMIXI. 



Among the tribes in which the ungues are simple and separate, 

 and the pygidium not exposed, the present one may be distin- 

 guished by tlie form of the mandibles, and by the hind tibiae being 

 truncate at tip, with the articular surface terminal, and though 

 somewhat oblique, not lateral as in Hylobiini. It follows from 

 this that the terminal spine representing the spur is situated on 

 the inner side of the apical surface. 



The mentum is oblong, and supported on a giilar peduncle 

 which is not longer than wide, and emarginate. The ligula and 

 labial palpi are less developed than in Hylobiini; the maxillaj are 

 entirely exposed. The mandibles are short, very stout, pincer- 

 shaped, emarginate at tip (except in Phytonomus piuictalua), con- 

 vex and sparsely sculptured on the outer surface, the basal condyle 

 large. Antennae inserted near the tip of the beak, geniculate ; 

 scape long, club elongate-oval, pointed, annulated, covered with 

 sensitive surface ; funiculus 7-jointed ; the seventh joint in some 

 species connected with the club. Beak moderately long, not 

 slender, antennal grooves extending nearly to the tip, deep, 

 directed towards the lower part of the eyes, which are more or 

 less transverse and narrowed beneath. Front coxoe round; con- 

 tiguous; middle coxa3 round, narrowly separated, entirely inclosed 

 by the meso- and metasternum. Side pieces of mesosternum 

 diagonally divided; of the metasternum, narrow dilated in front, 

 the outer angle making a sinuosity in the side margin of the 

 elytra. Ventral segments unequal; first and second longer; 



