TENEBRIONIDAE. 319 



trinus is distiiignislu'd from foreign genera of the same group by 

 the thorax being sinuate at base, and by the infiexed portion of 

 the elytra being formed entirely of the epipleura; ; the nientum 

 is trilobed in front, and the anterior tibiae are not dilated. 



Group II. — Blapstini. 



In this group the eyes are completely divided; the epistoma is 

 emarginate, and the infiexed part of the elytra is composed entirely 

 of the epiplcurai; the mentuni is not trilobed in front. In Noti- 

 bius and Conibins the dilatation of the anterior tarsi of the male 

 is very feeble, but in the genus hist named the anterior tibiaj of 

 that sex are bent and armed with a tooth, on the inner face, near 

 the base. 



Anterio)- tibise with the outer apical angle obliquely truncate ; 

 Intercoxal process of abdomen triangular, acute or oval at tip ; 



Antenna} long, slender. Mecysmus. 



Antennse stout ; 



Upper portion of eyes large, rounded. Blapstinus. 



Upper portion of eyes small, linear. Conibius. 



Intercoxal process broad, truncate at tip. Notibius. 



Anterior tibife broad, the apex emarginate, the outer apical angle pro- 

 longed. Ulus. 



Blapstinus contains many species, and is widely distributed; 

 the other genera occur west of the Rocky Mountains. 



Tribe VI.— OPATRINI. 



Body oval, not convex; head received by the thorax as far as 

 the eyes, which are transverse, strongly emarginate, and coarsely 

 granulated; epistoma emarginate, covering the base of the man- 

 dibles; labrum prominent; mentnm small, inserted upon a dis- 

 tinct gular peduncle; lignla prominent, not deeply emarginate; 

 maxillae exposed; elytra with not very wide epipleurie, occupying 

 the whole of the infiexed portion. Anterior coxte subtransverse 

 or rounded ; middle coxai with distinct trochantin, side pieces 

 attaining the cavities; hind coxffi distant; intercoxal process 

 truncate or acute; legs moderately stout, front tibite dilated in 

 our genera; tarsi setose beneath. Metasternuu) with narrow 

 eptsterna and distinct cpiniera. Ilind margin of third and fourth 

 ventral segments snbcoriac^eous. 



