98 MEMOIRS ON THE COLEOPTERA 



male small; abdomen strongly sculptured, nearly as in the preceding, 

 the first segment somewhat longer than the next three, much longer 

 than the last, the post-coxal plaques long, triangular and attenuated; 

 oblique prosternal groove deep as in the preceding. Length (cf) 

 1.75-1.9 mm.; width 0.6-0.65 mm. Michigan, .convexulum n. sp. 

 3 Color black, the elytra ferruginous throughout; under surface piceous 

 black, the legs and antennae pale rufous. Surface very shining, the 

 micro-reticulation everywhere obsolescent and scarcely discoverable, 

 except on the apical part of the head, the pubescence sparse and in- 

 conspicuous; head (9) much smaller than in the female of ephip- 

 pigerum and nearly as long as wide, much narrower than the pro- 

 thorax and with smaller eyes, the punctures very close-set through- 

 out, oval, becoming shallower and rounded anteriorly; antennae very 

 short, barely as long as the head, the ninth joint slightly wider than 

 the eighth; across the base of the head, between the hind limits of 

 the eyes, there is a shallow impression not extending to the sides; 

 prothorax but slightly wider than long, formed nearly as in ephip- 

 pigerum but with the median area broadly flattened, though with the 

 impressions barely traceable, the scattered punctures more abruptly 

 close-set laterally; elytra throughout nearly as in that species and 

 similarly sculptured on the flanks; pygidium obtusely parabolic, 

 black, nearly as long as wide, convex, with very coarse punctures, 

 close-set though not polygonally crowded; abdomen strongly sculp- 

 tured, the medial transverse series of foveae very conspicuous; basal 

 segment longer than the next three and much longer than the last, 

 the post-coxal plaques with their inner margin forming a distinct 

 line to the hind margin, the outer margins obsolete slightly behind 

 the middle of the segment. Length (9 ) i-55 mm.; width 0.42 mm. 

 North Carolina (Southern Pines), Manee. [Rhyzophagus eryth. 



Mels. Pennsylvania] erythropterum Mels. 



Color uniform or very nearly so throughout 4 



4 Form somewhat slender, the lustre shining; color piceo-rufous, the 

 elytra if anything more obscure than the anterior parts, the pubes- 

 cence sparse and inconspicuous; head well developed, but slightly 

 wider than long and distinctly narrower than the prothorax, rather 

 finely and sparsely punctured throughout, the eyes notably large, 

 convex and prominent; antennae about as long as the head, with all 

 the funicular joints transverse except the first, which is barely as 

 long as wide; prothorax quadrate, as long as wide, parallel, the sides 

 feebly arcuate, a little more so anteriorly, with a few serrules pos- 

 teriorly; surface broadly and almost evenly though very moderately 

 convex, sparsely punctate, more coarsely and closely toward the sides; 

 scutellum well developed; elytra barely one-half longer than wide, a 

 fifth or sixth wider than the prothorax, the parallel sides broadly 

 arcuate, the striae rather strong but not coarse, finely, loosely punc- 

 tate, the flanks with a few widely separated and irregular unim- 

 pressed series of punctures; pygidium wider than long, broadly para- 

 bolic, the punctures very coarse but separated, gradual!} 7 less coarse 

 and more elongate basally, the terminal segment of the male small; 

 abdomen with the basal segment much longer than the next three 



