160 Trans. Acad. Sci. of St. Louis. 
The male has very simple sexual characters, the fifth seg- 
ment being unmodified and the sixth having a small triangular 
median emargination. 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 confluens is an Erichsonian emendation of the originally 
published ‘‘ confluenta’’ of Say, (= Lathrobium confluen- 
tum). 7 
Hemimedon 0. gen. 
In general appearance the species of Hemimedon strikingly 
resemble the Pacific coast Oligopterus, 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 abdomen 
black, the legs and antennae dark rufous; head well developed but dis- 
tinctly narrower than the prothorax, slightly wider than long, the sides 
parallel and straight, the angles rather narrowly rounded; eyes at rather 
more than twice their own lengthfrom 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)......++eseseeeeceeeesees -FUfipes 2. Sp. 
Slender in form but similar in coloration and lustre to rujipes, the punctures 
of the head and pronotum less coarse and rather sparser, those of the 
latter notably feeble, of the elytra somewhat finer and denser but of the 
same character; head as long as wide, rather distinctly narrower than 
the prothorax, otherwise as in rujfipes; 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 rujipes,- 
