Casey — A Revision of the American Paederini. 67 
strong canaliculation throughout; female with the sixth ventral strongly 
and narrowly impressed along the middle posteriorly. Length 4.5- 
5.9 mm.; width 0.75-0.8 mm. Rhode Island (Boston Neck) and New 
York (Long Island) ...--eseceececesesessessesccsceves canonicus 2. sp. 
The descriptions have been taken from the male unless the 
contrary is expressed or evident. Texanus, which is prob- 
‘ably from the eastern or central parts of the state, resembles 
the El Paso saginatus considerably, but, besides the coloration 
of the legs, it differs in having the eyes larger and much less 
prominent and the part of the head behind them shorter, 
with less converging sides and much more broadly rounded 
basal angles, with certain other differences, the comparisons 
being made from the male. Canonicus may be distinguished 
from littorarius by its slightly more slender form and dis- 
tinctly smaller and shorter elytra. : 
Leucopaederus n. gen. 
This genus differs from Paederus and Paederillus in a 
number of characters, no one of which would perhaps be 
sufficient to qualify it, but which, in their summation, seem 
to be amply sufficient to demonstrate its generic isolation. 
When color alone, for example, is so constant a feature as we 
know it to be in Paederillus, this alone becomes an important 
and very significant distinction, but when this is supplemented 
by the much larger eyes, relatively small head and protho- 
rax, with the abdomen more gradually acuminate at apex and 
the much larger elytra, together with the rather different 
form of the prothorax, there can be but little doubt of the 
propriety or necessity of the course here suggested. The 
labrum in Leucopaederus is truncate and wholly edentate at 
apex, with a small and abruptly formed, parabolically rounded 
and completely edentate emargination at the middle, the sur- 
face adjoining the sinus being feebly swollen. We have at 
present but a single species as follows : — 
Form stout, moderately convex, polished, pale rufo-testaceous throughout 
the body and legs, the elytra more brownish in tinge and the extreme 
apex of the abdomen black; antennae piceous, gradually paler toward 
base; head small, but little longer than wide, the eyes large, prominent, 
