Casey — A Revision of the American Paederini. 237 
with the elytra, the fifth ventral unmodified, the sixth with the acutely 
angulate incisure large, its opening about a third as wide as the seg- 
mental apex, its sides beaded and broadly arcuate posteriorly, its depth: 
rather greater than the width. Length 4.6-5.0 mm.; width 0.65-0.7 
mm. Virginia and Pennsylvania........s++sseseeeeee+++-prolixus Er. 
Parallel in form, resembling the preceding but a little stouter, the pale color 
of the elytral apex extending less acutely anteriorly upon the suture, 
the eyes more convex and prominent, situated at obviously more than 
their own length from the base, the elytra broader and less elongate, 
distinctly wider but only slightly longer than the prothorax, as wide as 
the head; abdomen at base slightly narrower than the elytral apex, 
gradually wider posteriorly, the punctures finer and denser than in 
prolixus. Male with the acutely angulate incisure of the sixth ventral 
very small, deeper than wide, its opening occupying scarcely a fourth 
of the segmental apex, its sides broadly rounding posteriorly into the 
segmental apex. Length 5.0 mm.; width 0.65 mm. Texas (Aus- 
GIN) . cece sccccccnrccrccee vececesecessesccecccccesccess StIZilis DN. Sp. 
7— Form moderately slender, parallel, feebly shining, dark fusco-testa- 
ceous in color, the head, a large elongate-oval cloud on each elytron and 
the last two abdominal segments black, the latter color occasionally 
involving the entire venter; legs and antennae very pale as usual; head 
large, much wider than the elytra, the eyes rather small especially in 
the female, situated at very much more than their own length from the 
base, the basal parts of the head as in prolixus; prothorax large, oval, 
elongate, distinctly narrower than the head; elytra notably small, 
elongate, gradually narrowed toward tip, equal in width and length to 
the prothorax; abdomen at base as wide as the elytral apex, becoming 
gradually distinctly wider posteriorly, the sides straight as usual; 
punctures of the elytra and abdomen rather coarser than in prolixus. 
Male slightly more slender than the female but proportioned nearly 
the same, the acute incisure of the sixth ventral smaller than in pro- 
lixus, with its sides less broadly rounding posteriorly and its opening 
width decidedly greater than the depth. Length 4.6-5.0 mm.; width 
0.7mm. New York to Virginia (Fort Monroe).[=prolixus (Var.) Er.]. 
americanus 2. sp. 
Form narrower and more slender, parallel, dull in lustre throughout, black, 
the apical third of the elytra — becoming apical half on the suture — 
pale, the legs pale; head relatively rather small, scarcely as wide as 
the elytra, of the usual form, the eyes moderately convex and promi- 
nent and at more than their own length from the base, the sides 
behind them but feebly convergent, the angles less rounded than 
usual; prothorax scarcely visibly narrower than the head, but little 
longer than wide, otherwise of the usual form and sculpture; elytra 
scarcely longer than wide, very slightly wider than the prothorax and 
not quite as long; abdomen at base not quite as wide as the elytra and 
only slightly wider posteriorly. Length 4.4 mm.; width 0.58 mm. 
NOW YOrK s ccccccccccnscessccseccsevessvcccesbocccccccecs INOAPIS EP; 
8 — Elytra subequal in length and width to the prothorax............se.0. 9 
Elytra much wider and longer than the prothorax.....c.ssecessecesevceesel 
9— Body very slender, linear and parallel, densely sculptured throughout, 
