Casey — A Revision of the American Paederini. 87 



Form very stout, shining, black throughout, the legs aud antennae dull 

 rufous; head and elytra rather finely, very sparsely punctate, the pro- 

 notum hardly more coarsely and also very sparsely, the abdomen 

 minutely and densely punctulate; head small, longer than wide, the 

 sidts parallel and feebly arcuate, the angles broadly rounded; antennae 

 thick, the strongly obconic medial joints one-half longer than wide; 

 gular sutures moderately separated and feebly converging to the base; 

 prothorax broad, much wider than the head, slightly longer than wide> 

 the sides very nearly parallel, the angles rather rounded ; elytra large, 

 distinctly wider and a little longer than the prothorax, slightly longer 

 than wide, subparallel, the sides feebly arcuate, the surface rather 

 broadly impressed at each side of the suture; abdomen not quite as 

 wide as the elytra. Male with a distinct parallel impression in about 

 middle sixth of the fifth ventral, the sixth with a narrower, deeper and 

 more anteriorly attenuated impression, the apex having a triangular 

 emargination about as deep as wide, occupying the posterior part 

 of the impression, the edges of the notch thin, pale and membranous 

 at the bottom; female unknown. Length 7.3 mm.; width 1.4 mm. 

 Manitoba (Winnipeg) sparsellnm n. sp. 



17 — Elytra not wider than the prothorax and very much shorter, the form of 



the body more elongate and parallel 18 



Elytra slightly wider than the prothorax and only a little shorter; body 

 stouter and less parallel - 19 



18 — Elytra depressed, scarcely as long as wide, with the sides diverging 



from the base; body black, shining; punctures of the head and elytra 

 rather small, sparse, those of the pronotum much coarser, only moder- 

 ately sparse, of the abdomen minute and very dense, the surface dull in 

 lustre; head moderate in size, the eyes at nearly three times their own 

 length from the base; angles broadly rounded, the sides parallel and 

 more or less arcuate; antennae stout, with the strongly obconic joints 

 one-half longer than wide; prothorax large, a little wider than the head, 

 oblong, with the sides parallel and very slightly arcuate; elytra small, 

 barely as long as wide, depressed, the sides nearly straight and very 

 feebly diverging from the base ; abdomen fully as wide as the base of the 

 elytra. Male with the fifth ventral impressed in less than median third* 

 the impression wider than long, rounded anteriorly, not quite attaining 

 the base, the apex with a rounded shallow sinus bounding the im- 

 pression; sixth ventral with a narrower longitudinal impression, 

 the apex with a large, evenly rounded sinus, slightly wider than 

 deep and equal in width to the impression, the edges of the sinus nar- 

 rowly glabrous at the bottom, the impression clothed with short, very 

 stout spiculiform hairs. Length 8.0 mm.; width 1.1 mm. New Hamp- 

 shire (White Mts.) washingtoiii n. sp. 



Elytra normally convex, parallel, exactly quadrate; body polished, black 

 throughout, the legs bright, and the antennae dusky, rufous; 

 head moderate, the sides feebly arcuate, the angles broadly rounded; 

 antennae stout as in washingtoni; prothorax large, slightly wider than 

 the head, only slightly elongate, somewhat narrowed from apex to base, 

 the punctures much coarser than those of the head and elytra, which are 

 rather small, sparse; elytra equal in width to the prothorax and 



