Casey — A Revision of the American Paederini. 221 
the sides feebly converging and broadly rounded thence to the base and 
rapidly so and subsinuate thence: to the narrow apex, the punctures 
similar to those of the head but less confluent; elytra quadrate, par- 
allel, a third wider and one-fourth longer than the prothorax, equal in 
width to the head, closely and asperately punctate; abdomen parallel 
with very feebly arcuate sides, distinctly narrower than the elytra, 
minutely, closely punctate; hind tarsi rather shorter than usual. 
Male with a broadly rounded abrupt emargination occupying median 
third of the apex of the fifth ventral, from the bottom of which pro- 
jects a narrow slender aciculate process extending beyond the limits of 
the sides of the emargination; sixth segment with a triangular notch 
having straight sides and acute apex, somewhat deeper than wide and 
about one-third as wide as the segment; segmental surfaces unim- 
pressed. Length 3.9mm.; width 0.78 mm. District of Columbia. 
opaculus Lec. 
Sculpture coarse, the elytra always more or less sparsely punctate....... 3 
3 — Head broadly subtruncate at base, the eyes very large, the antennae 
short and thicker; pronotum with a smooth median line; elytra large, 
wider than the head; punctures of the head very dense but not coales- 
Cent; body less elongate. ..c ses ccccssccccccrccccesoce seccsecens eoeed 
Head rounded or subangulate at base, more elongate, the eyes moderate in 
size, the antennae longer and more slender; pronotum without a smooth 
median line; elytra smaller, never wider than the head; punctures of 
the head longitudinally confluent. .....cescecccecccces sees :sescecees BD 
4 — Body stout, parallel, moderately convex, deep black in color throughout 
except the elytral apex, which is pale flavo-testaceous and similar in 
color to the femora and tarsi, the knees and tibiae piceous, the anten- 
nae dusky testaceous; lustre dull, the elytra and broad median line of 
the pronotum polished; head as wide as long, coarsely and very densely 
punctate above and beneath, the eyes very large, broadly convex and 
not very prominent, almost continuing the outline of the tempora 
behind them and situated at about two-thirds of their own length from 
the base; tempora evenly rounded from the eyes to the neck, the base 
broadly, very feebly arcuate or subtruncate; prothorax slightly elon- 
gate, two-thirds as wide as the head, punctured like the latter except 
along the impunctate median line, broadly angulate at apical third, the 
sides thence just visibly converging and straight to basal fourth, then 
more convergent and subsinuate to the broad base, strongly converging 
and broadly subsinuate anteriorly to the narrow neck; elytra large, 
parallel, scarcely as long as wide, three-fifths wider and one-third 
longer than the prothorax, convex, strongly impressed throughout at 
each side of the suture, the punctures fine, sparse and scarcely at all 
asperate; abdomen parallel, narrower than the elytra but subequal in 
width to the head, the sides feebly arcuate, minutely, closely punctate; 
legs slender. Male unknown. Length 4.3 mm.; width 0.95 mm. 
Oregon (Albany),—Mr. Wickham.................++--Oregonus n. sp. 
Body similar in form, coloration and sculpture to the preceding but smaller 
in size, with the eyes more convex and prominent, the tempora behind 
them less converging to the broadly rounded basal angles, the feebly 
converging straight sides of the prothorax behind the obtuse anterior 
