Casey — A Revision of the American Paederini. 95 
Elytra relatively smaller, always shorter than the prothorax in both 
SEXES; SMaller SPCCIES.... cc cee cece ccccvsnsewessccescssessessesces G 
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 fine, 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 fine 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 parabolic sinus about a third 
as wide as the apex and but little wider than deep; female not known. 
Length 5.6 mm.; width0.9mm. Iowa (Iowa City),— Mr. Wickham. 
convictor b. 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 coarsely 
rugose by oblique light; abdomen not quite as wide astheelytra. Male 
unknown. Length5.5mm.; width0.8mm. lowa....amputans n. sp. 
Elytra in the female fully as long as wide and but just visibly shorter in 
Ge: WSIS 65a hae deen beeeh EUR KEUEdE Save uedi Walateeen ee uedaiecs 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 APCX.... eee ec wesc care seer cesccssersccccserece 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 
POUDGEE o ioc doa Ware e: Vielen cided isidns Wace obibewes God adedeniossevabuévvess. 40 
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, 
