LeConte.] 



1'HYTONOMINI. 



123 



10. Prothorax contiguous to the elytra 11, 



Prothorax pedunculate (p. 191) OTISHH i i* n v i i M. 



11. Hind angles of prothorax acute (p. 192) >i v<-i A IM. 



" " " " rectangular or 



rounded (p. 198) ANTllONoMINl. 



12. Funicle six or seven-jointed 13. 



five-jointed (p. 219) < IOMM. 



13. Scape extending upon the eyes (p. 210) imo>o *i iti M. 



" not extending upon the eyes (p. 211). TYCHIIBH. 



14. Ventral sutures more or less curved 14. 



entirely straight (p. 223).... I,.I:.MOS \< i IM. 



15. Humeri of elytra truncated by side pieces of 



mesothorax (p. 284)., I:\UIM. 



Humeri not truncated 16. 



16. Beak received in or upon the breast 17. 



Beak not received in or upon the breast; 



prosternum very long in front of the coxae, 



which are nearly contiguous (p. 221) I>EKKM>MIXI. 



17. Eyes more or less covered in repose, except 



in the group Phytobii (p. 280) 18. 



Eyes not covered 19. 



18. Body oval, pygidium covered (p. 223) CRYPTORII YN< HIM. 



" broad, pygidium exposed (p. 267) < 1:1 101: n v N< 11 1 M. 



19. Antennae geniculate, eyes very large (p. 259) ZY<.OI>IM. 



straight (p. 265) 



Tribe I. 



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

 pygidium not exposed, the present one may be distinguished by the form 

 of the mandibles, and by the hind tibiae being truncate at tip, with the ar- 

 ticular 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 mentuin is oblong, and supported on a gular peduncle which is not 

 longer than wide, and emarginate. The ligula and labial palpi are less de- 

 veloped than in Hylobiini; the maxillae are entirely exposed. The mandi- 

 bles are short, very stout, pincer-shaped, emarginate at tip, (except in Phy- 

 tonomus opimus) convex and sparsely sculptured on the outer surface, 

 the basal condyle large. Antennae inserted near the tip of the beak, geni- 

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

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

 nected 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 coxae 

 round; contiguous; middle coxae round, narrowly separated, entirely en 



