OF WASHINGTON. 29 



5. Labrum deflected; clypeal margin toothed; cross-veins in apical part 



of wing numerous Corydalis. 



Labrum horizontal, partly covering mandibles; clypeal margin not 

 so distinctly toothed; cross-veins in apical part of wing less 

 numerous Neuromas. 



6. Anterior ocellus small, round, more than twice its diameter from the 



posterior ocelli ; costal cells about as long as broad ; black species. 



Nigronia. 



Anterior ocellus large, transverse, not twice its long diameter from 

 the others; gray, mottled species. Chauliodes. 



Neohermes, n. gen. 



This new genus is proposed for such species as have the anal 

 vein with two forks, the anal cells subequal in length, the lower 

 with two veins, the upper with one, and no cross-vein between 

 the first branch of the anal vein and the vein from anal cell. 

 The costal cells are about as long as broad, and the antennae 

 are as near to the ocelli as to the eyes ; the branches of the 

 median vein are simple, and there are but three cross-veins 

 from radial sector to radius. 



The type is N. filicornis Banks (sub Chauliodes). This 

 genus includes also Chauliodes californicus Walker, C. 

 angusticollis Hagen, C. cinerascens Blanchard, and N. hum- 

 eralis Banks. 



Hermes Gray. 



This genus is restricted to a few forms closely allied to the 

 type species, H. maculipennis Gray. This is the only species 

 of this genus that I have examined. There are five or six 

 cross-veins from the radial sector to the radius. 



Protohermes van der Weele. 



In spite of their pale coloration the species of this genus are 

 extremely closely related to Hermes. I have examined only 

 albipennis Walker, anticus Walker, and grandis Thunberg. 

 These have five or six cross-veins from radius to radial sector, 

 and at least one branch of median vein is forked. 



Corydalis Latreille. 



The most important character for the distinction of this 

 genus is the strongly deflected labrum, and the corresponding 

 development of the clypeal margin with teeth. Acanthocorydalis 

 van der Weele may rank as a subgenus, having a spine on 

 head and more than three cross-veins between radius and 

 radial sector. 



