Casey — A Revision of the American Paederini. 185 
but only slightly rounded basal angles, the base truncate; punctures 
sparse, rather coarse; antennae nearly as in nigricans but rather thicker, 
the medial joints less than one-half longer than wide; prothorax more 
elongate, distinctly wider than the head, parallel and very feebly arcu- 
ate at the sides, the punctures only moderately sparse, rather coarse 
and distinct, unevenly serial along the median smooth area; elytra much 
elongated, parallel, fully a third wider and longer than the prothorax, 
the punctures small but distinct, rather close-set, serial except toward 
tip, sometimes rather confused throughout; abdomen parallel, distinctly 
narrower than the elytra. Male with the fifth ventral unmodified, the 
sixth feebly impressed along the middle, the sides of the impression 
obtusely rounded and not abrupt, the apex with a subtriangular sinus 
with rounded angle, nearly a third as wide as the apex, somewhat wider 
than deep and apparently eccentric and asymmetric, being to the right 
of the centre — estimating from the segmental base — and with its right © 
side more strongly diverging from the axial line than the left; female 
not at hand. Length 4.5 mm.; width 0.8mm. New Jersey. [= Lathro- 
bium tricolor Csy.?] «++ ccccccsccecesccccceccevsccceces Ventralis Lec. 
Body larger and much stouter, the head black; prothorax and elytra uniform 
and concolorous, rufo-piceous, the abdomen piceous -black, becoming 
rufous at tip and narrowly at the apex of each segment; legs and anten- 
nae testaceous; head nearly as in ventralis, the eyes rather larger, the 
nearly straight sides equally feebly converging and meeting the broadly 
arcuate base in obtuse angles, which are scarcely at all rounded; 
prothorax distinctly elongate, much wider than the head, parallel, the 
sides broadly arcuate, the punctures rather coarse and not very sparse, 
not lineate along the smooth area; elytra large, much elongated, sub- 
parallel, a third wider and two-fifths longer than the prothorax, the 
punctures not coarse but distinct, impressed, rather close-set and par- 
tially serial; abdomen broad, equal in width to the elytra, finely and 
densely punctulate. Male unknown; female with the sixth ventral very 
obtusely subangulate and rounded at tip. Length 4.9 mm.; width 0.92 
MM. Pennsylvania....csccccesseccsececccevecccccccccses DAFdAa D. Sp. 
3 — Antennae half as long as the body in the male, rather shorter in the 
female, slender, but very slightly incrassate distally, the medial joints 
nearly twice as long as wide. Body rather stout, only moderately convex, 
colored as in collaris; head fully as long as wide, coarsely and sparsely 
punctate, parallel at the sides, the angles rounded; prothorax large, 
only very slightly longer than wide, smaller and straighter at the sides 
in the female, much wider than the head, the sides feebly convergent 
from apex to base and broadly, evenly arcuate throughout; anterior 
angles rather distinct, the punctures fine and very sparse, lineate along 
the median smooth space; elytra depressed, slightly elongate, the sides 
feebly diverging and straight throughout, a fourth wider and a third 
longer than the prothorax, the punctures strong, though not very coarse, 
not close-set, arranged in even impressed series, confused toward 
tip; abdomen broad, scarcely narrower than the elytra, minutely, 
densely punctulate. Male with the fifth ventral unmodified, the sixth 
not impressed but broadly glabrous toward the middle, the apex with 
a large triangular notch much wider than deep, two-fifths as wide as 
