328 GEO. H. HORN, M. D. 



to be osculant with Trogositide tendencies, in tlie same way that 

 Smicripini have feeble Monotomide affinities. 



Mr. Reitter has described a genus IxiON, in which the tarsi are 

 said to be 4 — 4 — 3 in the male. 



One genus only is known in our fauna. The species are as follows: 



Thorax longer than wide 1, 



Thorax as wide or wider than long 4. 



1. — Elytra with distinctly impressed striae which attain the tip and punctured 



their entire length scalpturatus Mann. 



Elytra with rows of punctures merely 2. 



2. — Thorax in % very decidedly narrowed from apex to base, sides nearly 



straight; thorax beneath nearly smooth cyliurtricus Lee. 



Thorax in ^ scarcely or not narrowed posteriorly, sides in both sexes 



feebly arcuate; thorax beneath punctured 3. 



3. — Elytra wider than thorax; color piceous, rufous at base. 



dianidiatus Mann. 



Elytra wider than thorax; color uniformly brown bruuneus Horn. 



Elytra not wider; color pitchy black, each with two rufous spots. 



bipiinctatiis (Say). 

 4. — Prosternum and side pieces coarsely and moderately densely punctured; 



epipleurse distinctly punctured at base appi'O.Yiiiiaius Lee. 



Prosternum and side pieces sparsely punctured; epipleurse smooth. 



Elytra pitchy black rcinotus Lee. 



Elytra each with two oblique rufous spots on each ininiitiis Mann. 



R. scalpturatus Mann. — Piceous or rufo-piceous, moderately depressed. 

 Head moderately but not densely punctate, front with a feeble impression on 

 each side. Third joint of antennae slightly longer than the two following. 

 Thorax longer than wide, sides feebly arcuate and gradually narrowed to base; 

 disc at middle subdepressed, surface coarsely but not densely punctui'ed at 

 middle, finely punctured at the sides. Elytra not wider than the apex of the 

 thorax, disc subdepressed, sides feebly arcuate at apical half; surface distinctly 

 striate, striae entire but feebler at apex and with moderately coarse punctures 

 closely placed but not serrate, intervals flat. Prosternum very sparsely punc- 

 tured at middle, sides and side pieces coarsely and densely punctured. Meta- 

 sternum and abdomen coarsely but sparsely punctured. Pygidium coarsely 

 punctured. Length .14 inch ; 3.5 mm. 



The color of this species is variable, four specimens in ray cabinet 

 are decidedly ferruginous, others are piceous, while one exhibits 

 distinct evidences of having the elytra piceous with a humeral and 

 subapical paler spot. One specimen in my cabinet from New York, 

 differs in having the elytra still more deeply striate. I am unwilling 

 to separate it as distinct on the one specimen. 

 Occurs in Vancouver, Nevada and New York. 



R. cyliiidriciis Lee. — Elongate, cylindrical, rufo-piceous. Head sparsely 

 and finely punctured, more coarsely at sides and occiput. Third joint of 

 antennae nearly as long as the three following united. Thorax longer than 

 wide, sides straight and gradually convergent % or very feebly arcuate f; 



