SCARAB^IDAE. 143 



tared, and more hairy species, of a dark green color, with reddish- 

 brown elytra, is found in Utah. 



The genus Antichira (Macraspis McLeay) may be expected 

 to occur in Texas ; a species is found iu the neighboring parts 

 of Mexico, and is oblong, of a brilliant emerald-green metallic 

 color. It will be known by the thorax not margined behind, and 

 the very large scutellum. It belongs to the group Antichirse. 



Tribe II.— DYNASTItf I. 



Insensible transitions through foreign genera connect closely 

 this tribe with the preceding, but those found in our fauna will 

 not produce much difficulty in the mind of the student. 



The mentum is usually narrowed and subacuminate in front, 

 rarely truncate. The claws of the tarsi are equal, and simple, 

 except in the male of Ligyrus relictus, where the inner claw of 

 the anterior tarsi is thickened, dilated, and suddenly incurved, 

 and in Polymoechus Lee, where the outer claw of the middle 

 and hind tarsi of the male is armed with a strong tooth. The 

 labrum, always visible in the preceding tribe, is here almost in- 

 visible, and sometimes in part membranous. 



This tribe, among its foreign members, numbers the largest 

 Coleoptera existing ; some of the genera are remarkable for the 

 size and form of horns on the thorax and head of the males. 



Organs of stridulation are found in many genera ; they consist 

 of rugose spaces, usually on the propygidium, sometimes on the 

 inner surface of the elytra. The fifth ventral segment and the 

 propygidium are connate, and the spiracle is on the suture nearer 

 the anterior than the posterior margin. 



The sub-tribes represented in our fauna are as follows : — 

 Labial palpi inserted at tlie sides of the mentum ; 



Head and prothorax unarmed in both sexes. Cycxocephalini. 



Head and prothorax armed, or at least tuberculate, in both sexes ; 

 Anterior feet of the males not elongated. Oryctini. 



Anterior feet of the males elongated. Dynastjni. 



Labial palpi inserted behind the mentum. Phileukini. 



Sub-Tribe 1.— Cyclocephalini. 



But two genera of this sub-tribe exist in our fauna ; they have 

 the appearance of Melolonthidse, and are readily distinguished 

 from the following sub-tribes by the thorax and head being en- 



