THE WATER SCAVENGER BEETLES. 



267 



U. Elytra piceous, with a common indefinite pale space divided 

 by the suture, but not reaching apex ; sides of thorax and 

 humeral umbone pale. indistixctus. 

 hh. Form short, very convex ; head vertical ; punctuation of elytral 

 intervals more indistinct than that of thorax. 

 j. Surface opaque, more or less alutaceous ; elytra with distinct 

 stria?; apex with a distinct pale spot. 

 7c. Entire surface alutaceous ; elytral stria? fine, but reaching 

 apex. . 524. lugubris. 



kk. Elytra alone alutaceous, their stria? very fine and not 

 reaching the apex. 525. tristis. 



jj. Surface shining ; elytral stria? replaced by rows of fine punc- 

 tures; apex with an indistinct rufous space extending 

 slightly along the suture. 526. navicularis. 



gg. Interval between the seventh and eighth stria? narrow and with 

 but one row of punctures. 



I. Elytra with an indefinite pale space at apex; color piceous or 



brownish. 527. analis. 



II. Elytra with pale space at apex sharply limited by a curved 



line, not extending along the side margin ; color black, shin- 

 ing. 528. OCELLATUS. 



518 (1664). Cercyon pubescens Lee, Proc. Phil. Acad. Nat. ScL, VII, 1855. 



374. 



Oval, moderately convex, somewhat attenuate behind the middle. Dull 

 reddish-brown, sparsely pubescent ; head piceous. Thorax twice as wide 

 as long, narrowed in front, sides curved from base to apex ; surface slightly 

 rugose, without punctures. Elytra with nine rather deeply impressed punc- 

 tured stria?; intervals flat on basal half, convex and alternately more ele- 

 vated at apex, very finely and sparsely punctate. Mesosternal elevation 

 elongate-oval, acute in front, truncate behind. Length 1.5 mm. 



Lawrence County; frequent at carrion bait and on fungi. Jnne 

 10- July 29. Probably throiighout the State but overlooked on ac- 

 count of small size. Said to be often abundant in dried horse dung. 



519 (1666). Cercyon hemorrhoidals Fab.. Syst. Ent, 1798. 67; 



nigricolle Say, Ed. Lee, II, 294. 

 Oval, moderately convex. Elytra piceous or brownish, their tips slight- 

 ly paler than disk. Thorax closely punctate. Elytra 10-striate, the stria? 

 distinct at apex, rather closely punctate; intervals flat, densely and rather 

 coarsely punctulate. Length 2.5-3 mm. 



Marion, Putnam and Posey counties; frequent. April 6-Octo- 

 ber 17. This is the species listed as flavipes Fab. and nigricolle 

 Say. 



520 (1672). Cercyon melanocephalus Linn., Faun. Suec, 1761, 144. 

 Oval, slightly oblong, moderately convex. Head and thorax piceous or 



black, shining; elytra usually reddish with a triangular piceous space ex- 

 tending from base one-half or more to apex and a subhumeral stripe pic- 



