CERAMBYCIDAE. 283 



genera, though ahvavs (h'cply einarg-inutiMl, and eiiil»racing th(^ 

 anU'iiiuil tubercles. 



Tlic genera in our fauna may be divided into the Ibllowing 

 groups:— 



Thighs not toothed beneath ; 



Ligula more or less corneous. Okmks. 

 Ligula membranous ; 



Middle coxal cavities angulated. Cekamuyci. 



Middle coxal cavities rounded. Ibidio.nks. 



Thighs beneath armed with a broad tooth. CuKii. 



Grouji 1. — Oemes. 



The ligula is more or less corneous, and usually only omargi- 

 nate at tip; though in Achryson, corneous, with the front part 

 membranous, and broadly bilobed ; the body is slender and elon- 

 gate, the palpi frequently very unequal, the antennae usually long, 

 and longer than the body in % ; the eyes are usually very large, 

 convex, coarsely granulated, and very deeply emarginated. The 

 thighs are rather slender, except in Gracilia, where they are 

 strongly clavate. 



Three sub-groups are indicated : — 



Epimera of mesothorax large ; 



Front trochantins very distinct. Oemes. 



Front trochantins not visible. Acheysonks. 



Epim(;i-a of mesothorax small. Gkacili^s:. 



V Sab-Group ] . — k m e s . 



Threespccies of Oenic, and one each of ]\[alacopterus and Eu- 

 crossus from Arizoim, represents this sub-group in our fauna ; they 

 are pale brown, slender insects, with the antenna; hairy beneath ; 

 rough with small acute tubercles on the under surface of the 3d, 4th, 

 and 5th joints in Oeme ; these joints in Eucrossus are not rough, 

 but are armed on the inner side with a terminal spine; the proster- 

 num is very narrow and prolonged in Oenie ; moderate in width in 

 Eucrossus ; mesosternuin narrow in Oeme and Malacopterus, wider 

 and truncate in Eucrossus; the pal[)i are dilated in the latter two, 

 but scarcely so in the former, very unetiual in all.* The prothorax 



* Lacordaire, 1. c. viii. 222, says tliat the palpi ar(!_sube(|ual in Oeme, 

 but his sj)ecinien seems to liave been mueli mutilated. 



