OF WASHINGTON. 



245 



Wings a little narrower than in flavida and at tip more narrowly 

 rounded, entirely black, very little shining, not transparent, more or less 

 distinctly punctulate; venation very similar to that in flavida, but the 

 first and second furcals are decidedly shorter, the latter more gently 

 curved, third and fourth furcals also shorter; the marginal cells are 

 smaller, the first almost wider than high and about twice as large as the 

 second. 



(3\ Genital plate still narrower than in flavtda, oblong, its posterior 



FIG. ii. Cnlophya nigripennis : first 

 larval stage. 



FIG. 12. Cnlophya nigripennis : second 

 larval stage. 



edge nearly straight, anterior edge convex, tip obtusely pointed; forceps 

 as \njlavid(i. 



9. Genital segment as in flavida but always more or less infuscate. 



Lives exclusively on Rhus copallina. Numerous specimens 

 are before me from Washington, D. C. (collected in May) and 

 various parts of Georgia (collected by myself in April). 



Immature specimens resemble C.Jiavida but may be distin 

 guished by the shorter vertex, shorter frontal cones, the sexual 

 characters of the male and by slight differences in the venation. 



[ISSUED NOVEMBER 12, 1904.] 



