452 Coleopterological Notices, V. 



abruptly convergent and just visibly sinuate thence to the base, the latter 

 wider than the apex ; disk even, with a transverse impressed biarcuate sulcus 

 and two sublateral fovese at basal third, the sulcus dilated in the middle. 

 Elytra relatively small, one-half longer and wider than the prothorax, the 

 humeri very oblique and subdentate behind the base, this appearance being 

 due to the deep post-humeral fovea ; disk with a deep coarse stria. Abdomen 

 a little longer and slightly narrower than the elytra ; dorsal segments equal, 

 not perceptibly carinate, the fifth tumid in the middle. Legs short. Length 

 1.2 mm.; width 0.3 mm. 



Pennsylvania. 



A single female specimen, having the venter unmodi6ed, the ter- 

 minal segment large, nearly flat, and posteriorly produced at the 

 middle in a rounded lobe. 



R. dentiventris n. sp. — Moderately stout, convex, polished, paler, 

 rufo-ferruginous througiiout, impunctate, the vestiture rather long, coarse 

 and somewhat abundant. Head large, rather wider than the prothorax, a 

 little wider than long, the foveje distant by nearly one-half the total width, 

 connected by a coarse deep impressed semi-circular and entire sulcus ; trans- 

 verse frontal ridge very long, scarcely more than one-half as wide as the 

 maximum width ; eyes moderate, prominent, not longer than the tempora, 

 the latter feebly convergent and nearly straight : base broadly sinuate ; 

 antennae scarcely more than one-third longer than the head; under surface 

 with a few widely scattered erect setse. Prothorax a little wider than long, 

 widest rather before the middle, the sides there evenly and not very narrowly 

 rounded, gradually convergent and broadly sinuate thence to the base, 

 strongly convergent near the apex, the latter much narrower than the base ; 

 transverse biarcuate sulcus at basal third deep and well developed. Elytra 

 moderate in size, two- thirds longer and three- fourths wider than the protho- 

 rax, not quite as long as wide, convex, with a deep coarsely impressed, gradu- 

 ally attenuate discal stria, extending behind the middle. Abdomen not longer 

 and distinctly narrower than the elytra, the segments equal. Length 1.15 

 mm. ; width 0.4 mm. 



Virginia. 



The male has the anterior and intermediate legs shorter and 

 stouter than the posterior as usual, the venter broadly, feebly im- 

 pressed near the apex, with the sixth segment large, deeply sinuate 

 at apex, receiving a nearly circular flat pygidium, and the third 

 strongly obliquely toothed at the sides, the teeth prominent also 

 from a dorsal point of view at the sides of the apparent second 

 segment. This is a very distinct and interesting species, repre- 

 sented before me by a single male. 



In the only antenna remaining, the sixth and seventh joints are 



