Casey — A Bevision of the American Paederini. 81 



Antennae extremely stout, attenuated toward tip, the middle joints never 

 longer than wide, rounded at the sides and strongly constricted at 

 base ; body generally larger and stouter, the legs rather stout 2 



Antennae stout, with the joints not distinctly longer than wide, but 

 obconic in form, the legs moderately stout 9 



Antennae stout to moderately slender, generally rather shorter than the 

 head and prothorax, the joints distinctly elongate and obconic; legs 

 relatively rather slender to stout in form 14 



2 — Elytra bicolored, black basally and red apically 3 



Elytra unicolorous, black 6 



3 — Elytra distinctly longer and wider than the prothorax in ijoth sexes, 



black, shining, the elytra bright rufous, becoming black in basal two - 

 fifths; legs dark rufous, the antennae piceo-testaceous; head distinctly 

 wider than the prothorax in both sexes, nearly as wide as the elytra 

 in the male, evidently narrower in the female; eyes at between two and 

 three times their length from the base, the angles well rounded ; width 

 a little before the angles slightly greater than at the eyes; neck three- 

 fifths as wide as the head ; gular sutures rather narrowly separated, 

 feebly converging to the base; prothorax about a fourth longerjthan 

 wide, the angles all obviously rounded; the sides very feebly converging 

 and nearly straight; punctures like those of the head, rather coarse, 

 deep, irregular in arrangement and moderately sparse, broadly sparse 

 toward the middle of the head, the median smooth thoracic^line not 

 defined by punctured series; elytra large, parallel, slightly longer than 

 wide, the punctures coarse, deep, moderately sparse and arranged in 

 very irregular series; abdomen parallel, slightly narrower than the 

 elytra, finely and only moderately closely punctulate; legs moderately 

 stout. Male with the fourth and fifth ventrals narrowly and very feebly 

 impressed along the median line, the sixth also similarly impressed 

 along the middle toward base but very narrowly swollen toward apex, 

 the latter rectilinearly truncate, with a very small median sinus wider 

 than deep, the edges of which are callous and polished; surface of the 

 sixth segment more finely and sparsely punctulate and pubescent, 

 except the lateral slopes of the apical tumidity, which are clothed with 

 stiff black hairs; sixth segment of the female rather narrowly lobed 

 at tip. Length 10.0 mm.; width 1.5 mm. New York (^Hudson 



Valley) amplipenne 



Elytra equal or subequal in length to the prothorax 4 



Elytra distinctly shorter than the prothorax 5 



4 — Elytral punctures rather small, feebler and sparser and arranged in rather 

 well-defined series; body stout, parallel, shining, black, JJjthe elytra, 

 — gradually and nubilously toward apex — and the legs throughout, 

 rufous ; antennae rufo-piceous ; head large, only very slightly wider near 

 the base than at the eyes, the latter moderate; angles not very broadly 

 rounded ; neck three-fifths as wide as the head, the punctures moderately 

 coarse, deep and sparse toward the sides, very remotely scattered 

 elsewhere ; prothorax unusually large, scarcely visibly narrower than 

 the head, about a fifth longer than wide, the sides very feebly converg- 

 ing posteriorly throughout and nearly straight, the angles narrowly 

 rounded at apex, broadly at base ; punctures coarse but;not very deep, 



