Casey — A Revision of the American Paederini. 137 



little longer than wide, much wider than the head in both sexes, the 

 sides subparallel and feebly arcuate, the basal angles broadly rounded, 

 the punctures fine, feeble, very sparse and inconspicuous; elytra 

 parallel, distinctly elongate, about a fourth wider and a fifth longer 

 than the prothorax in the male, relatively wider and longer in 

 the female, the punctures not very coarse, strongly impressed and 

 distinct, not very close-set in distinctly impressed series, confused 

 toward tip; abdomen rather wide, but little narrower than the elytra, 

 densely punctulate. Male with the fifth ventral unmodified, the sixth 

 narrowly glabrous and subimpressed along the middle, the apex with a 

 triangular emargination about as deep as wide, gradually formed, 

 about a third as wide as the segmental apex, with its angle acute and 

 not obviously rounded; lobes of the apex strongly, evenly rounded; 

 female more abundant than the male, nearly similar but with a rela- 

 tively smaller prothorax. Length 5.0-5.8 mm.; width 0.85-0.92 mm. 

 Massachusetts, Rhode Island, New York, Pennsylvania, Indiana and 

 Iowa collaris Er. 



Antennae rather stout, distinctly incrassate distally, nearly half as long as 

 the body, with the medial joints about three-fourths longer than wide 

 in the male; coloration as in fallax; head fully as long as wide, 

 rather coarsely, very sparsely punctate, nearly as in collaris but with 

 the basal angles less broadly rounded; prothorax as in collaris but 

 shorter, only very slightly longer than wide, the sides distinctly 

 arcuate, similarly finely and sparsely punctate ; elytra distinctly elon- 

 gate, the sides subparallel, a third wider and longer than the prothorax, 

 the punctures smaller, feebler and less close- set than in collaris but 

 similarly arranged, the series much less impressed; abdomen narrower, 

 distinctly narrower than the elytra, densely dull and punctulate as 

 usual. Male with the fifth ventral unmodified as usual, the sixth nar- 

 rowly glabrous along the middle only in posterior half or slightly more, 

 not distinctly impressed, the apex with a very small triangular notch 

 about as deep as wide, only about a fifth as wide as the apex, the angle 

 of the notch not distinctly rounded, the lobes of the segmental apex 

 rounded, the notch apparently somewhat asymmetric, the right side — 

 proceeding from the segmental base — being more divergent than the 

 left; female unknown. Length 5.3 mm.; width 0.85 mm. North 

 Dakota (Devil's Lake) vagans n. sp. 



Antennae thick but filiform, not appreciably incrassate distally, only very 

 slightly longer than the head and prothorax in the female, the medial 

 joints nearly as in vagans; coloration as in that species; head small, 

 nearly as in vagans throughout; prothorax rather large, distinctly 

 wider than the head and longer than wide, the sides parallel, broadly 

 arcuate, more rounded posteriorly and narrowed toward base as usual, 

 the punctures small but deep and distinct, sparse; elytra much elon- 

 gated, the sides subparallel, two-fifths wider and longer than the pro- 

 thorax, the punctures very fine and feeble, inconspicuous, widely set in 

 unimpressed series, confused toward tip: abdomen parallel, densely 

 dull, much narrower than the elytra. Male unknown. Length 5.7 mm. ; 

 width 0.9 mm. Nevada (Elko), — Mr. Wickham habilis n. sp. 



7 — Male sexual characters of the collaris type, a small triangular notch at 



