228 MEMOIRS ON THE COLEOPTERA 



This species differs from daviger in its smaller size, narrower form, 

 smaller prothorax, simple and not subgranular punctures of the 

 pronotum, very much stronger and more compressed abdominal 

 sculpture, more slender and less strongly clavate antennae and in 

 coloration. 



Somatium lustrans n. sp. Rather broadly oval, strongly convex and 

 shining, brownish-testaceous, the abdomen black, flavate at apex, the 

 legs pale brown; punctures of the head and pronotum extremely minute, 

 sparse and simple, of the elytra asperate and sparse, not imbriform, 

 the asperities isolated, the ground sculpture minutely and irregularly 

 reticulate, of the abdomen coarsely but feebly, regularly imbriform, 

 becoming smooth and simply sparsely punctate apically; pubescence 

 moderate, sparse; head distinctly more than half as wide as the prothorax, 

 the eyes moderate; antennae short, pale, the second joint much longer 

 than the first, longer than the next two and nearly twice as thick, three 

 to five mutually equal in thickness, cylindric, six a little, the seventh 

 much, wider, both moderately transverse, the club blackish, not very 

 abrupt, the ninth joint moderately transverse; prothorax much more 

 than twice as wide as long, the arcuate converging sides continuing 

 the curvature of the basal part of the elytral flanks, the elytra subparallel, 

 convex, the suture a third longer than the prothorax; abdomen at base 

 not quite as wide as the elytra, strongly tapering and with straight sides. 

 Length 0.7 mm.; width 0.36 mm. Missouri (St. Louis). 



Also an isolated species, of very small size, not closely related to 

 any other described thus far. 



Somatium abruptum n. sp. Narrower and more oblong-oval, nearly 

 similar in coloration and sculpture, the anterior parts rather darker, 

 the punctures of the head and pronotum closer and not simple but mi- 

 nutely asperulate, the asperities of the elytra much closer and stronger; 

 pubescence rather fine, decumbent, moderately close on the elytra; 

 head nearly as in the preceding, the antennae short, pale throughout, 

 the second joint much longer than the first, longer than the next two 

 and nearly twice as thick, seventh only about one-half thicker than the 

 third and transversely suboval, the club very abruptly formed, broad, 

 not at all darker in color than the stem, the eighth and ninth joints 

 strongly transverse, obtrapezoidal, the last about as long as the two 

 preceding, obtusely pointed; prothorax less transverse than in the pre- 

 ceding and with the sides less converging but rather more arcuate from 

 base to apex, more than twice as wide as long, at base equal in width 

 to the base of the elytra, the latter well developed, the suture two-fifths 

 longer than the pronotum; abdomen nearly as in lustrans throughout and 

 similarly sculptured. Length 0.63 mm.; width 0.28 mm. Mississippi 

 (Vicksburg). 



Allied to lustrans in general structure but much narrower and 

 less oval, differing decidedly in sculpture, as stated, and with the 



