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 prolixus Er. 



Parallel in form, resembling the preceding but a little stouter, the pale color 

 of the elytral apes 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- 

 tin) strigilis n. 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 

 0.7 mm. New York to Virginia (Fort Monroe). \_=prolixus (Var.) Er.]. 



americanas n. 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. 

 New York linearis Er. 



8 — Elytra subequal in length and width to the prothorax 9 



Elytra much wider and longer than the prothorax 10 



9 — Body very slender, linear and parallel, densely sculptured throughout, 



