Coleopterological Notices, VII. 595 



narrower than the first, a little longer than -wide; three to eight narrower, 

 equal in width, feebly obconic, the eighth parallel; third fully }4r fourth and 

 sixth }4,, fifth nearly 3^, longer than Avide; seventh quadrate; eighth }4 "wider 

 than long; ninth a little wider, Jg wider than long; tenth similar but larger; 

 nine to eleven increasing rapidly, the latter nearly as long as the preceding 

 four, Prothorax % wider than long, widest before the middle, the sides not 

 acutely rounded, rather strongly convergent and feebly arcuate toward base, 

 finely, sparsely punctate; median fovea distinct and perforate. Elytra nearly 

 3^ wider than long, the sides strongly divergent and broadly arcuate from base 

 to apex; humeral plica feeble; sutural stria deep, the discal more feeble; inter- 

 mediate basal fovea deep, strong and circular; disk sparsely punctulate and 

 feebly undulato-rugulose, highly polished. Abdomen minutely and sparsely 

 punctulate, as wide as the elytra, the first segment more than ^2 as long as the 

 latter, the carinje % as long as the segment, distinctly divergent, arcuate and 

 very approximate. Length 1.2 mm. ; width 0.65 mm. 



Iowa (Iowa City). 



The male has the first and last ventrals subequal in length, and 

 each broadly and just visibly impressed in the middle, the latter 

 broadly and arcuately lobed at apex to fit the broad and rather 

 deep sinuation, with broadly rounded limiting angles, at the apex 

 of the last dorsal. 



In the male the abdominal carinae are separated at base by the 

 full strial interspace, but in the female they are separated by only 

 about \ of this distance, and are withal distinctly shorter and 

 nearly straight through equally divergent. In the female of di- 

 vergens they are separated at base by the full strial interspace. 



This species is allied rather closely to divergens, but may be 

 known from it, not only by the female abdominal carinse, but by 

 the larger eyes, more punctate pronotum and less sculptured 

 elytra and also by the somewhat smaller size. Divergens is com- 

 mon about Massachusetts Bay. 



R. kansaiia. — Moderately ventrieose, strongly convex, highly polished 

 and impunctate throughout, rather pale rufo-testaceous, the head scarcely, the 

 abdomen perceptibly, darker ; pubescence long, erect and bristling, moderately 

 abundant. Head notably narrower than the prothorax, the eyes prominent, 

 moderately large, situated at rather less than their own length from the base. 

 Antennse distinctly longer than the head and prothorax, the funicle slender ; 

 club gradually formed, becoming stout toward tip ; second joint oblong, a little 

 narrower than the first ; three to eight equal in width and much narrower ; 

 third 3'2) fourth and sixth %, fifth %, seventh }{, longer than wide ; eighth 

 about % wider than long, cylindric ; ninth feebly obtrapezoidal, fully as long 

 as wide ; eleventh rather longer than the three preceding combined and much 

 thicker, obliquely acuminate. Prothorax relatively rather large, fully 3^ 



