498 Memoirs on the Coleoptera 



small but extremely shallow, moderately separated in single series; 

 anterior coxae separated by less than half their width, the presternum 

 feebly impressed. Length (cf) 2.4 mm.; width i.i mm. Missouri 

 (near St. Louis). Two examples scaphinella n. sp. 



Prothorax larger, with less converging sides and less deeply constricted 

 apex 5 



5 — Bodj' more oblong-oval, convex, shining, black, the legs black, some- 

 times rufescent; scanty squamules above nearly as in the preceding; 

 beak (cf) rather thick, more arcuate but straighter basally, sculp- 

 tured densely and much longer than the head and prothorax, or ( 9 ), 

 longer and much more slender, more evenly and strongly arcuate, 

 smoother and not quite half as long as the body; antennae (cf ) at 

 three-fifths, or (9) at the middle; prothorax more than one-half 

 wider than long, less trapezoidal than in scaphinella, the sides very 

 moderately converging and straight, rapidly rounding to the tubu- 

 late apex, which is much more than half as wide as the base; punc- 

 tures moderate, less coarse in the female, in great part confluent, 

 isolated basally; elytra ovoidal, much longer in the male, slightly 

 wider than the prothorax and between two and three times as long; 

 sculpture nearly as in the preceding, but with the interstitial punc- 

 tures smaller, closer and less regularly uniserial. Length (cf 9 ) 

 2.5-3.0 mm.; width i. 0-1.2 mm. Missouri (St. Louis). Four 

 specimens marginata n. sp. 



Body more elongate and more regularly oval, black, subalutaceous, 

 with rufous legs; beak in the male a little longer and thinner and 

 more evenly arcuate than in the preceding, not quite so densely 

 sculptured, much longer than the head and prothorax, the antennae 

 near three-fifths; prothorax less transverse, only two-fifths wider 

 than long, the sides, apex and sculpture nearl}' similar, the smooth 

 median line sharpl}^ defined and entire; elytra elongate-oval, only 

 slightly wider than the prothorax and two and one-half times as 

 long; striae somewhat coarser, the uniserial interstitial punctures 

 larger but very shallow; presternum of the male feebly impressed 

 along the middle anteriorl}^ the coxae separated by much less than 

 half their width, the prosternal surface distinctly though loosely 

 albido-squamulose as usual in the genus. Length (cf) 3.15 mm.; 

 width 1.2 mm. Missouri (St. Louis) elongata n. sp. 



, In this genus, as well as Limnoharoides , the female is apparently 

 smaller and rather less elongate than the male. Haplostethops 

 seems to be singularly restricted geographically; I have never seen 

 an example of it taken far from the median section of the Mississippi 

 River, and nearly all my representatives were, in fact, taken very 

 near St. Louis. 



Idiostethus Csy. 

 In this genus the body is much shorter and relatively stouter than 

 in the preceding, with more prominent humeral callus, subglabrous 



