AMERICAN PHILOSOPHICAL SOCIETY. 496 



Body black, glabrous, depressed ; bead witb two obsolete pice- 

 ous spots oa the vertex ; moutb piceous ; palpi paler at base ; 

 antennae rufous, base paler ; labium elongated, nearly as long as 

 the labrum, bisetous near the tip ; thorax much abbreviated, as 

 broad as the elytra, much contracted behind, exterior and pos- 

 terior margins depressed, [79] lateral edge reflected, dorsal line 

 conspicuous, posterior angles acute; elytra profoundly striated, 

 striae punctured on the sides, interstitial lines convex ; pectus 

 and postpectus with obsolete dilated punctures ; feet testaceous: 

 venter piceous towards the tip, impunctured. 



In this species the emargina of the anterior tibia is very small 

 and placed very near to the tip, so as to be undiscoverable but 

 by particular examination. Judging from the generic definition 

 which authors have given, this species must diiFer from the 

 other species of this genus in the form of the labium, which is 

 elongated, acute, as in Pogonophorus, and has on each side near 

 the tip a long hair or bristle, instead of spines, as in the latter 

 genus ; it does not therefore agree with the character given of 

 the labium of Nehria, — " labium subquadrate," " labium short," 

 '' nearly quadrate," &c., nor yet with that of Pogonophorus, of 

 which this part is tricuspidate. But as it will not agree with 

 any other than the two genera above mentioned, and as it diflfers 

 from the latter genus in not having the mandibles dilated at base, 

 nor the maxillary palpi much elongated, I have thought proper to 

 place it with the present genus, to which it seems to have the 

 closest affinity. 



OMOPHRON Latr. 



Tongue very short ; antennae filiform ; maxills ciliated on the 

 exterior side; body short, nearly hemispherical; thorax trape- 

 xoidal, transverse, sinuated, or lobed behind ; anterior pair of 

 tibiae slightly emarginate on the inner side. 



0. LABIATUM. — Blackish ; labrum, margin of the thorax and 

 of the elytra whitish : antennae, palpi, and feet testaceous. 



Length one-fourth of an inch. [°0j 



Scohjtes lahiatm niger, labio thoracis elytrorumque margine argenteis. 

 Fabr. Syst. Eleut. 1, p. 248. 



Head blackish, base punctured ; eyes large ; casus triangular, 



1823.] 



