NORTH AMERICAN COLEOPTERA. 187 



size, widest at two-fifths its leugti\ from the apex, where it is slightly wider 

 than the head and distinctly wider than long; sides strongly, evenly rounded, 

 moderately convergent and feebly sinuate toward base; the latter broadly, 

 very feebly arcuate, one-half wider than the apex, which is transversely 

 truncate, and four-fifths as wide as the pronotal disk; basal angles obtuse 

 and very slightly prominent, not at all rounded; disk strongly, evenly con- 

 vex, polished, almost impunctate, lateral foveee rather small, not very 

 deeply impressed; median puncture very small; base finely margined, sur- 

 face immediately before it feebly impressed, the impression obsolete in the 

 middle. Elytra at base distinctly wider than the prothorax, at apes fully 

 twice as wide as the latter; sides eveuly, rather strongly arcuate; together 

 broadly truncate behind; disk evenly, rather strongly convex, much wider 

 than long, two-thirds longer th m the pronotum, finely, very feebly and 

 obsoletely, evenly and rather sparsely punctate; sutural striae strong; discal 

 strong, feebly arcuate, abruptly terminating at one-fifth the length from the 

 apex. Ahdomen impunctate, highly polished, rather convex; first segment 

 longer than the next two together, with two fine, very distinct carinae, which 

 are distant by two-fifths the entire width, nearly one-half as long as the 

 segment, and nearly parallel; at each side, near the border, and partially 

 under the elytra, there is a large spongiose fovea; between this and the 

 border a fine attenuated carina, two-thirds as long as the segment. Legs 

 long and slender. Length 1.4 mm. 



California; (Sonoma Co. 4). 



The description is taken from tlie male; tlie female anten- 

 na3 are normal, robust and scarcely as long as those of the 

 male. In the latter the terminal segment of the dorsal sur- 

 face is ver^^ broadly emarginate at apex, the emargination 

 being evenly rounded and nearly ten times as wide as deep; 

 the ventral segments are not at all impressed. 



This species belongs near sagax Lee, but differs greatly 

 in the structure of the male antennae as recorded in the 

 original description of that species. 



R. tumidicornis u. sp. — Form rather slender, piceous; antennas slightly 

 paler at apex; elytra bright rufous, base and apex clouded with a darker tint, 

 legs dark rufous; pubescence rather coarse, very short, not dense; integuments 

 polished. Head moderate in size; eyes rather small, very convex, coarsely 

 granulated and prominent, at fully their own length from the base; sides be- 

 hind them feebly convergent, distinctly arcuate; base broadly truncate; angles 

 narrowly rounded, not prominent; surface broadly, feebly convex, excessively 

 minutely, sparsely punctate; on a line through the middle of the eyes there 

 are two large, deeply impressed foveas, mutually three times as distant as 

 either from the eye; also near the apex a slightly smaller fovea, with the 



