Casey — A Revision of the American Paederini. 207 
very slightly longer than wide and but little narrower than the head, 
parallel and straight at the sides from the obtuse and slightly rounded 
angles at apical fifth to the rather broadly rounded basal angles, the 
longitudinal impression at each side of the median line in basal third 
distinct; elytra somewhat longer than wide, about a third wider and 
one-fourth longer than the prothorax; gular sutures rather widely 
separated, the under surface of the head broadly and feebly convex, 
shining, finely, rather sparsely punctulate. Male secondary characters as 
in arizonae. Length 2.4 mm.; width0.4mm. Iowa to Lake Superior. 
notangulus n. sp. 
12 — Form slender and parallel, the elytra being but little wider than the head ; 
abdomen piceous, gradually paler at tip; surface noticeably shining, the 
minute punctules only moderately close-set throughout; head well 
developed, as wide as long, parallel or subparallel at the sides, the eyes 
moderately large, convex and prominent, the base distinctly sinuato- 
truncate, the angles moderately rounded; antennae rather short; pro- 
thorax but little longer than wide, obviously although not greatly 
narrower than the head, the sides distinctly converging and straight 
from the obtuse but scarcely at all rounded angles near apical fifth, to 
the feebly rounded basal angles, the median line slightly and obtusely 
elevated very near the base; elytra relatively small, slightly longer 
than wide, not quite a fourth wider and about one-fifth longer than the 
prothorax, the sides just visibly diverging from the basal angles; 
gular sutures widely separated, the under surface of the head sparsely 
punctulate and shining though feebly reticulate. Broadly angulate 
notch of the sixth male ventral much shallower than in the preceding 
species but of the same form. Length 2.1-2.4 mm.; width 0.3-0.35 
mm, Texas (Austin). [= bicolor Csy,]...........+.--versicolor Csy. 
Form less slender and not parallel, the elytra much wider than the head, 
pale dusky-testaceous throughout, the prothorax rather brighter rufous; 
surface somewhat strongly shining; head well developed, as wide as 
long, the eyes rather large, prominent; antennae slender, but little 
shorter than the head and prothorax, pale in color; prothorax relatively 
small, notably elongate, much narrower than the head, the sides very 
slightly converging and not quite straight from the obtuse and rather 
broadly rounded angles near apical fourth, to the less obtuse but 
rounded basal angles, the median line prominent only very near the 
base; elytra unusually developed, a fourth longer than wide, about 
two-fifths wider and a third longer than the prothorax; gular sutures 
moderately separated, rather deeper than usual, the under surface of 
the head rather closely and strongly punctulate. Male unknown. Length 
2.8 mm.; width 0.45 mm. New York (Hudson Valley). 
hudsonicus n. sp. 
13 — Species of the Atlantic coast Tegions...---sccerccssevevesscesseevveld 
Species of the SomOran region ....seeevecesessccsscccecsssssccsscsccceseld 
14— Head but little longer than wide, body only moderately slender.....15 
Head elongate; body extremely Slender....sseccecssse-seeccencsessesseelG 
15 — Body parallel, alutaceous in lustre, the abdomen black or blackish, 
feebly paler toward tip, the head and elytra blackish-piceous, the pro- 
thorax dusky testaceous, the legs and antennae pale throughout; head 
