Casey — A Revision of the American Paederini. Ill 



hind the latter, finely, rather closely punctured laterally; antennae 

 moderately slender, about as lon^ 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 lobe 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 as in stibium, the antennae rather distinctly 

 longer than the head and prothorax, moderately slenler, the medial 

 joints slightly less than twice as long as wide in the female but very 

 nearly that in the male; prothorax a Utile broader and less elongate, 

 parallel and sensibly arcuate at the side3, distinctly wider than the head 

 in the female and much wider in the male, strongly, suniewhat 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 flue 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 of the notch; female with the sixth ventral broadly 

 and obtusely lobed at apex. Length 5.8 mm. ; width 1.1 mm. Massa- 

 chusetts, Michigan and Wisconsin (Bayfield) niger Lee. 



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 relatively stout, fully as long as the head and prothorax, 

 the medial joints but little more than one-half longer thau 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 



