[37] 



NORTH AMERICAN COLEOPTERA. 193 



sides strongly rounded to the base, which is transversely truncate; surface 

 broadly, feeb'y convex, scarcely perceptibly, sparsely and very obsoletely 

 punctate; occipital fovese on a line through the anterior portions of the eyes, 

 moderate in size, not very deeply impressed, mutually three times as distant 

 as either from the eye; apical fovea entirely wanting; apex abruptly and very 

 strongly declivous, having two small approximate cilia'e tubercles; antennas 

 long and slender, one-half as long as the bodj T , club slender; basal joint large, 

 irregular, second much smaller, slightly more robust than the third, the lat- 

 ter distinctly longer than wide, fourth smaller, subquadrate, fifth to seventh 

 slightly dilated, the sixth slightly the shortest, as wide as long, eighth nar- 

 row, joints eight to eleven very gradually, evenly increasing in width, all 

 longer than wide. Prothorax widest at two-fifths the length from the apex, 

 where it is as wide as the head, distiuctly wider than long; sides evenly, 

 strongly arc late, moderately convergent and feebly sinuate to the base; the 

 latter broadly, feebly arcuate, four-fifths as wide as the disk, nearly one-half 

 wider than the apex; the latter transversely truncate; disk strongly convex, 

 not visibly punctate except along the base; lateral foveae rather small, not 

 very deeply impressed, at one-third the length from the base; median rather 

 large, somewhat longitudinally elongated. Elytra at base slightly wider than 

 the prothorax at apex twice as wide as the latter; sides evenly and rather 

 strongly arcuate; disk evenly, rather strongly convex, sparsely anl very ob- 

 soletely punctate; sutural striae deep, nearly parallel; discal distinct, arcuate 

 terminating at one-fifth the length from the apex. Abdomen moderately con- 

 vex; first segment scarcely as long as the next two together; basal carinae 

 fine, slightly divergent, distant by slightly more than one-third the total 

 width, very short, about one-fourth as long as the segment. Legs slender; 

 posterior tibiae very feebly clavate, slightly beat; tarsi rather long. Length 

 1.2 mm. 



California; (Sonoma Co. 3). 



Described from the male, the terminal dorsal segment 

 being rather broadly emarginate, the etnargination evenly 

 rounded and feeble, about eight or nine times as wide as 

 deep. The female is quite similar to the male, but has the 

 antennae normal in structure and slightly shorter; the vertex 

 also lacks the two ciliate tubercles, and the median punc- 

 ture of the pronotum appears to be less elongate. 



Belongs near compar Lac, but is abundantly distinguished 

 from that species by the structure of the antennae and the 

 darker colors. 



R. franoiscana u. sp. — Form rather slender, black; antennae brovvuisb.- 

 piceous; e'ytra dark rufous; legs dark piceous-brown; under surface black; 



