Casey — A Revision of the American Paederini. 95 



Elytra relatively smaller, always shorter than the prothorax in both 

 sexes ; smaller species 6 



6 — Elytra equal in width to the prothorax; body deep black throughout, 



the legs and antennae pale ferruginous; form parallel, the integuments 

 thicker; head much narrower than the prothorax, parallel and feebly 

 arcuate at the sides, the angles broadly rounded; neck half as wide, 

 the punctures rather flne, very sparse ; antennae relatively thicker than in 

 cruralis, although longer than the head and prothorax, the medial joints 

 strongly obconic and somewhat less than twice as long as wide; pro- 

 thorax only very slightly longer than wide, the sides just visibly con- 

 verging from apex to base and very feebly arcuate ; angles rather broadly 

 rounded; punctures not very coarse but larger than those of the head, 

 very sparse; elytra very nearly as long as wide, at base equal in width 

 to the prothorax, just visibly wider at apex, the punctures flne and 

 rather sparse, not definitely subserial; abdomen as wide as the elytra, 

 dull; legs moderately stout in the male. Male with the fifth ventral 

 unimpressed, the apex very feebly sinuate toward the middle, the sixth 

 segment rounded at tip, with the usual parcibollc sinus about a third 

 as wide as the apex and but little wider than deep; female not known. 

 Length 5.6 mm.; width 0.9 mm, Iowa (Iowa City), — Mr. Wickham. 



conrictor n. sp. 



Elytra obviously wider than the prothorax; body more or less pale piceous 



in color throughout, the legs and antennae paler and ferruginous, the 



former notably stout in the male and less so in the female; surface 



polished, the abdomen dull; form parallel and moderately convex... 7 



7 — Elytra in the female distinctly shorter than wide, very much shorter 



than the prothorax; head much narrower than the prothorax, finely and 

 very remotely punctate, nearly as in the preceding form throughout, the 

 antennae similar, the neck rather wider, a little more than half as wide 

 as the head; prothorax distinctly longer than wide, the sides obviously 

 converging from apex to base, the angles rounded, the punctures notice- 

 ably coarse, confused and only moderately sparse; elytra rather de- 

 pressed, the sides distinctly diverging from the base, the punctures 

 somewhat fine, sparse and confused, but with the surface rather eoar.-ely 

 rugose by oblique light; abdomen not quite as wide as the elytra. Male 

 unknown. Length 5.5 mm. ; width 0.8 mm. Iowa....amputans n. sp. 

 Elytra, in the female fully as long as wide and but just visibly shorter in 

 the male 8 



8 — Male with the emargination of the sixth ventral smaller, much shallower, 



broadly rounded at the bottom, less than a third as wide as the seg- 

 mental apex and between three and four times as wide as deep; fifth 

 and sixth segments not distinctly modified on the disk, the former rec- 

 tilinearly truncate at apex 9 



Male with the emargination of the sixth ventral larger and deeper, but little 

 wider than deep, triangular in form, with the anterior angle narrowly 

 rounded 10 



9 Body moderately stout, the head as in amputans but with the basal angles 



rather less broadly rounded, the antennae longer and somewhat thicker, 

 filiform, distinctly longer than the head and prothorax, with the 

 medial joints almost twice as long as wide; punctures rather fine. 



