[35] 



NORTH AMERICAN COLEOPTERA. 191 



enth one-half wider than the tenth, obliquely ovoidal, pointed. Prothoraa 



widest at two-fifths the length from the apex, where ir is much wider than 

 the head and one-third wider than long; sides acutely rounded, slightly con- 

 vergent and feebly arcuate to the base, before which they are nearly straight; 

 base broadly, feebly arcuate, one-half wider than the apes ami three-fourths 

 as wide as the disk; apex broadly, very feebly emarginate; disk strongly con- 

 vex, very minutely punctate; lateral foveas large, feebly impressed, at two- 

 fifths the length from the base; median small, well before the base. Elytra 

 at base just visibly wider than the prothorax, at apex slightly less than twice 

 as wide as the latter, broadly truncate, feebly trisiuuite; sides evenly, not 

 strongly arcuate; disk broadly convex, finely, not densely, very feebly punc- 

 tate; sutural strias deep, feebly arcuate; diseal flue, distinct, not deeply im- 

 pressed, terminating at one-tenth the length from the apex Abdomen 

 rather short, moderately convex; first segment distinctly longer than the next 

 two together; carinse fine, distinct, ne.irly one-half as long as the segment, 

 feebly divergent, feebly directed outward at apex, distant by les^ than one- 

 fourth the total width; carinas adjoining the margins extremely line, almost 

 obsolete. Legs long and slender; posterior tibi;e feebly clavate, slightly bent 

 inward toward the apex, where there is externally a short groove for the re- 

 ception of the tarsi when reflexed. Length 1.3 mm. 



Texas; (Austin 1). 



Described from the male; the terminal dorsal segment 

 lias at the apex a small semicircularly founded emargina- 

 tion, nearly twice as wide as deep, the tingles being acute 

 and slightly produced; last ventral segment very feebly im- 

 pressed in the middle. 



This species belongs to the rubicund'! type of the genus 

 and should be placed near that species, front which it differs 

 in the smaller and deeper apical emargination of the male. 



The external groove at the apsx of the posterior tibiae ap- 

 pears to be a generic character. 



R. nevadensis n. sp. — Moderately slender, piceous; elytra rufous, slightly 

 darker at apex; legs dirk, brownish-piceous; auteime slightly paler, rufo- 

 fuscous; integuments polished; pubescence short, co.trse. evenly but not 

 densely placed. Head moderate; eyes rather large, prominent, at scarcely 

 more than one-half their own length from the base; sides behind them 

 rather strongly convergent and strongly arcuate to the base, which is very 

 broadly truncite; surface rather strongly convex, not perceptibly punctate 

 behind; having on a line just in advance of the middle of the eyes two larger 

 deeply impressed fovee, which are mutually two and one-half times as dis- 

 tant as either from the eye; between the antenna transversely impressed, 



