Casey — A Revision of the American Paederini. 159 
twice their own length from the base; sides almost perfectly straight, 
the angles somewhat Obtuse but scarcely at allrounded; second anten- 
nal joint almost as long as the next two combined and much thicker, 
prothorax almost as long as wide, scarcely narrower than the 
head, but just visibly narrower at base than at apex, the sides 
nearly straight, the angles scarcely at all rounded; elytra quad- 
rate, parallel, much wider than the head, a fifth wider and one-fourth’ 
longer than the prothorax. Length 1.75 mm.; width 0.33 mm. Alabama. 
delicatula n. sp. 
The male sexual modification of the sixth ventral is very 
nearly as in Sciocharis, being obtusely cuspidiform, with 
widely flaring arcuate sides of the emargination, but the 
apical margin of the fifth segment has a broadly rounded 
coplanar lobe, about a seventh as wideas the segment, pro- 
jecting from the middle, which lobe is suggested by the very 
feeble bisinuation of the edge in some forms of Sciocharis. 
Other species of this interesting genus will doubtless be dis- 
covered in the course of careful collecting. 
Trachysectus Csy. 
This genus also has but a single known species, which is 
widely distributed throughout the colder parts of the North 
American continent, east of the Rocky Mountains. It may 
be readily known by its coarse and confluent sculpture and 
short tarsi, the first four joints of the posterior equal and the 
anterior slightly dilated : — 
Rather stout, parallel, moderately convex, blackish-piceous, the elytra — 
rather broadly at tip, — antennae toward base and legs, rufous; prothorax 
also generally rufescent; surface feebly shining, densely sculptured, 
the head coarsely, with the punctures elongated by compression, the 
pronotum longitudinally rugose, the hairs borne from the minute gran- 
uliform punctules along the middle of the depressions or at the middle 
of the cephalic punctures, the punctures of the elytra sparser and 
smaller, asperate, of the abdomen extremely minute; head well devel- 
oped, as wide as the elytra, a little wider than long, parallel and 
straight at the sides, the angles broadly rounded; eyes moderately 
developed, convex; prothorax much narrower than the head, obtrap- 
ezoidal, wider than long, the anterior angles obtuse but only slightly 
rounded; elytra quadrate, parallel, a fifth wider and two-fifths longer 
than the prothorax. Length 3.56 mm.; width 0.8 mm. Rhode Island 
and Virginia to Iowa and Minnesota........,.....+...--confluens Say 
