160 Trans. Acad. Set. of St. Louis. 



The male has very simple sexual characters, the fifth seg- 

 ment being unmodified and the sixth having a small triangular 

 median emaro-ination. The under surface of the head is as 

 coarsely and densely sculptured as the upper and the gular 

 sutures are rendered conspicuous by reason of the fact that 

 the narrow space between them is highly polished, sculpture- 

 less and concave, gradually broadening near the base. The 

 name confiuens is an Erichsonian emendation of the originally 

 published '■^ conjluenta'^ of Say, {= Ijathrobium conjluen- 

 tum). 



Hemimedon n. gen. 



In general appearance the species of Hemimedon strikingly 

 resemble the Pacific coast Oligopteriis, but the likeness is in 

 great part superficial, as shown by the generic characters of 

 the table, the labrum being quite different in structure. The 

 genus appears to be very circumscribed in habitat, and, so 

 far as known, limited in range to the more southern parts of 

 the Appalachian mountain system. The two species before 

 me are mutually as closely allied as those of Oligopterus, but 

 may possibly be recognized by the following characters : — 



Stouter in form and parallel, feebly shining, blackish-piceous, the abdomcu 

 black, the legs and antennae dark rufous; head well developed but dis- 

 tinctly narrower than the protborax, slightly wider than long, the sides 

 parallel and straight, the angles rather narrowly rounded; eyes at rather 

 more than twice their own length from the base; punctures rather coarse 

 and moderately dense; prothorax large and distinctly obtrapezoidal, the 

 sides broadly, feebly arcuate, the angles well rounded, the punctures 

 finer than those of the head, well separated, the sculpture tending 

 toward longitudinal rugulation; elytra small, slightly narrower than the 

 head, much shorter than wide and much narrower and very much shorter 

 than the prothorax, the sides rather strongly diverging from base to 

 apex, the surface finely but strongly, rather closely and asperately punc- 

 tate. Length 3.1 mm.; width 0.55 mm. North Carolina (Highlands) 

 and Virginia (Pennington Gap) ruflpes n. sp. 



Slender in form but similar in coloration acd lustre to r?f/i^es, the punctures 

 of the head and pronotum less coarse and rather sparser, those of the 

 latter notably feeble, of tbe elytra somewhat finer and denser but of the 

 same character; head as long as wide, rather distinctly narrower than 

 the prothorax, otherwise as in rufipes; prothorax much smaller, 

 nearly as long as wide, only just visibly obtrapezoidal, the sides feebly 

 arcuate and the angles rounded; elytra similar to those of rufipes, 



