330 GEO. H. HORN, M. D. 



punctures, rather closely placed, becoming finer at apex but still distinct. 

 Epipleurae distinctly punctured at base. Prosternum sparsely punctured at 

 middle, densely and more coarsely at the sides, side pieces sparsely punctured. 

 Abdomen coarsely but sparsely punctured. Pygidium coarsely and moderately 

 densely punctured. Length .10— .12 inch; 2.5 — 3 mm. 



The sexes searnely differ in the form of the head and thorax. 



Specimens occur in which the rufous spits of the elytra are not 

 apparent, and varieties may also occur (although I have not seen 

 such), in which the spots spread so as to leave merely the margin 

 and apex piceous. 



This species occurs most abundantly in Canada and the States 

 bordering the great lakes. 



R. appro SEiiinatns Lee. — Piceous, subdepressed, antennae and legs rufous. 

 Head moderately punctured, rather more coarsely at sides and base, frontal 

 impressions moderate. Third joint of antennae equal to the next two together. 

 Thorax distinctly wider than long, sides moderately arcuate, hind angles 

 broadly rounded, surface with moderately coarse punctures not densely placed 

 but equally distributed. Elytra subdepressed, not wider than the thorax, sides 

 slightly arcuate at basal half, surface feebly striate, striae with moderately 

 coarse punctures rather closely placed, becoming somewhat finer toward the 

 apex. Prosternum rather coarsely and moderately densely punctured, side 

 pieces more coarsely punctured. Epipleurae distinctly punctured at base. 

 Abdomen coarsely punctured. Pygidium moderately densely punctate. Length 

 .12 inch; 3 mm. 



I have seen but one 9 specimen of this species. It closely re- 

 sembles the next, but is easily known by the sculpture of the under 

 surface and the more closely punctured striae. 

 One specimen from New York. 



R. reniotus Lee. — Piceous, moderately convex, antennae and legs rufous. 

 Head coarsely but sparsely punctured, more finely in front. Antennae with 

 third joint as long as the two following. Thorax slightly wider than long, 

 Bides feebly arcuate, hind angles broadly rounded, surface moderately and 

 equally punctate. Elytra nearly parallel, moderately convex, surface with 

 etrise of moderately coarse punctures rather closely placed, gradually finer to 

 tip. Thorax beneath sparsely and rather finely punctured. Epipleurae smooth. 

 Abdomen with first segment rather finely and sparsely punctured, segments 

 two to five more coarsely. Pygidium moderately punctate. Length -.10 inch; 

 2.5 mm. 



Occurs in Pennsylvania and Canada. 



R. iniuutus Mann. — Form subdepressed, piceous, shining, legs and antennra 

 rufous, elytra each with two rufous spots which at times become suffused and 

 cover the entire disc. Head sparsely punctate obsoletely alutaceous. Antennae 

 with third joint as long as the next two together. Thorax slightly wider than 

 long, sides feebly arcuate and very slightly narrowed posteriorly, disc moder- 

 ately and evenly punctate, intervals obsoletely alutaceous. Elytra not wider 

 than the thorax, parallel, with rows of moderate punctures which are rather 

 closely placed, becoming finer toward the tip. Epipleurae smooth at base. 



