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) canonicus n. 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 



