390 Coleopterological Notices, V. 



Maryland. 



The small head may be exceptional and an individual feature in 

 the unique type, for it varies a good deal m fuscipennis ; I find, 

 however, that the sexual characters at the ventral apex are very 

 nearly constant, whatever may be the size of the head. The present 

 species is allied closely to fuscipennis, but differs in having two 

 small feeble tubercles at the apex of the sixth ventral plate, sepa- 

 rated mutually by only one-eighth or one-tenth of the entire width, 

 also in the parallel sides of the prothorax. The seventh ventral is 

 abruptly produced in a narrow, gradually almost parallel, narrowly 

 truncate ligula, longer than wide, with the surface at apex broadly 

 and feebly beveled, the surface of the segment at the base of the 

 ligula acutely and confluently bituberculate and bisetigerous. The 

 transverse grove of the mentum is entire and in the form of a cir- 

 cular arc. 



O. pemisylvaiiicus Erichs. — Gren. Staph., p. 792; Lee: Trans. Am. 

 Ent. Soc, VI, p. 235. 



Dark rufo-piceous, the elytra, legs and basal parts of the antennae 

 pale, brownish-flavate ; surface polished, glabrous. Head scarcely 

 visibly narrow^er than the prothorax, transverse, the frontal margin 

 not produced, broadly arcuate in the middle ; antennae not quite as 

 long as the head and prothorax, moderately incrassate. Prothorax 

 three-fourths wider than long, widest at the middle, the sides almost 

 evenly arcuate ; base and apex subequal ; disk finely, sparsely punc- 

 tate like the head. Elytra slightly wider and distinctly longer than 

 the prothorax, rather sparsely, not coarsely punctate, a broad me- 

 dian area of each feebly impressed and more closely punctured. 

 Abdomen parallel, distinctly narrower than the elytra, subimpunc- 

 tate. Length 3.4-4.4 mm.; width 0.15-0.95 mm. New York to 

 the Gulf States. 



The sixth ventral plate of the male has at apex two small 

 tubercles, distant by one-sixth of the entire width ; the seventh 

 is feebly produced in a gradually narrowed, short flat ligula, much 

 wider than long, with its apex emarginate, and the surface of the 

 segment at the base of the ligula is obtusely elevated in the form of 

 a short, transverse, anteriorly arcuate ridge, the highest point of 

 Avhich is the middle and not the setigerous lateral extremities as in 

 fuscipennis and its allies. The arcuate line of the mentum is very 

 fine and is subinterrupted in the middle. The head in the female is 

 much smaller than in the male, with the eyes relatively larger. 



