604 Goleopterological Notices, VII. 



This is quite an isolated species, which I am unable to compare 

 with any other, and which will be readily identifiable among^ 

 those of the present group by its elongate form. The male has 

 the last ventral concave at the middle, the last dorsal with an even 

 and moderately broad sinus, limited by broadly rounded angles^ 

 the entire margin having a distinct beaded edge. The locality is 

 open to some doubt, but will probably be found to be correct as 

 surmised above. 



R. arcifer. — Eather strongly ventricose, convex, and highly polished 

 throughout; rufo-testaceous, the head less pale and the abdomen blackish, 

 impunctate throughout, the pubescence moderately short and dense, coarse and 

 strongly recurved. Hexid distinctly narrower than the prothorax, with the 

 usual equilateral triangle of deep pubescent fovese, the eyes very prominent 

 and situated at obviously less than their own length from the base. Antennse 

 long and slender, % as long as the body, the club gradually formed; second 

 joint relatively small, much shorter and narrower than the first, % longer than 

 wide ; three to seven equal in width and obviously narrower, much elongated ;. 

 third 1, fourth just visibly more than 1, fifth nearly V/ii sixth slightly more 

 than 1, and seventh %, longer than wide; eighth slightly thicker and more as- 

 perate, properly forming a part of the club, quadrate ; ninth obtrapezoidal, 

 slightly elongate; tenth not quite as long as wide, slightly asymmetric, the 

 inner angle at apex more acute; eleventh not as long as the three preceding, 

 obliquely pointed, the inner side flattened toward base. Prothorax nearly % 

 wider than long, widest before the middle, the sides rounded but not partic- 

 ularly prominent; apex a little less than }4 t^s maximum width and not % as 

 wide as the base; surface strongly convex, the lateral fovese at basal %\ me- 

 dian fovea normal, perforate. Elytra well developed, twice as wide as the pro- 

 thorax, slightly shorter than wide, the suture % longer than the humeral 

 width; sides distinctly divergent and broadly and distinctly arcuate; humeral 

 swelling distinct; striae and fovese normal. Abdomen shorter and quite dis- 

 tinctly narrower than the elytra, the first segment rather long and well devel- 

 oped, with the carinse straight, short and parallel, scarcely }4, as long as the 

 segment and separated by a little more than }^ of the total width. Legs rather 

 long, the intermediate femora notably swollen toward the middle. Length 

 1.5 mm. ; width 0.68 mm. 



Kansas. 



The intermediate tibise of the male are compressed and broadly 

 arcuate, except toward apex, the outer edge bristling with long 

 erect hairs ; the last ventral is large and is evenlj^ concave, with 

 the apex sinuate and bilobed, the last dorsal short and broadly 

 sinuate at tip, apparently in circular arc, with rather clearly de- 

 fined subangular lateral limits. It is unnecessary to add that 

 this is one of the most distinct forms of the genus in its aberrant 



