Casey — A Revision of the American Paederini. 111 
hind the latter, finely, rather closely punctured laterally; antennae 
moderately slender, about as long as the head and prothorax in the 
female, the medial joints distinctly less than twice as long as wide; 
prothorax much wider than the head, distinctly elongate, being longer 
and narrower than in finitimus, parallel and almost perfectly straight at 
the sides, strongly and rather closely punctate; elytra parallel, much 
elongated, strongly, somewhat closely punctate, about two-fifths longer 
and wider than the prothorax; abdomen slightly narrower than the 
elytra. Male unknown; female with the sixth ventral unimpressed, 
distinctly lobed at tip, the Jobe moderately broadly rounded at apex. 
Length 6.0 mm.; width 0.95 mm. Montana:(Kalispell)..stibium n. sp. 
Eyes larger, well developed, at distinctly less than twice their own length 
from the base. Head nearly asin stibiwm, the antennae rather distinctly 
longer than the head and prothorax, moderately slender, the medial 
joints slightly less than twice as long as wide in the female but very 
nearly that in the male; prothorax a little broader and less elongate, 
parallel and sensibly arcuate at the sides, Cistinctly wider than the head 
in the female and much wider in the male, strongly, somewhat closely 
punctured, the smooth median line narrow and sometimes almost oblit- 
erated; elytra much broader in both sexes, but little longer than wide, 
a third wider and a fourth longer than the prothorax in the male, two- 
fifths wider and a fourth longer in the female, the punctures fine but 
distinct, moderately close-set; abdomen obviously narrower than the 
elytra in both sexes; body black throughout, the legs black when 
mature, with the tarsi slightly paler, the hind tarsi four-fifths as long as 
the tibiae. Male with ventrals one to four unmodified, the fifth narrowly 
and rather strongly impressed along the median line throughout; sixth 
transversely truncate at tip, with a small and very narrow, acutely 
angulate notch, much deeper than wide and not more than a twelfth or 
fourteenth as wide as the apex; pubescence not materially denser in 
the neighborhood cf the notch; female with the sixth ventral broadly 
and obtusely lobed at apex. Length 5.8 mm.; width1l.lmm. Massa- 
chusetts, Michigan and Wisconsin (Bayfield)................niger Lec. 
16 — Body parallel, deep black throughout, the legs pale, the antennae in« 
fuscate, slightly paler toward base; head small, rather longer than 
wide, arcuately subtruncate at base, not very finely and somewhat 
sparsely punctate toward the sides, the latter parallel and slightly ar- 
cuate; basal angles broadly rounded; eyes rather smaller than usual, 
the antennae relatiyely stout, fully as long as the head and prothorax, 
the media] joints but little more than one-half longer than wide; pro- 
thorax large and greatly developed, unusually convex, very much wider 
than the head, distinctly elongate, the sides parallel and feebly arcuate ; 
anterior angles moderately rounded, the punctures coarse, deep and 
unusually sparse, gradually finer laterally as usual, the median smooth 
line well defined; elytra very slightly wider than the prothorax and 
about four-fifths as long, not quite as long as wide, depressed, the sides 
feebly diverging from the basal angles, the surface rugose but polished, 
rather finely but strongly, sparsely punctured; abdomen about as wide 
as the elytra, dull as usual. Male with the fourth ventral just visibly, 
the fifth more distinctly but feebly, impressed along the middle, the 
