II 



26 Annals Entomological Society of America [Vol. X, 



between the two is the hghter color of the knees. I may 

 add that the figures made by v. d. Wulp for the Biologia, 

 although himself an eminent dipterist, were not always strictly 

 accurate in details, and it may be the differences Enderlein 

 points out do not really exist, and that L. pallidipennis Williston 

 is in reality a synonym of L. plumula Loew. I fear that Mr. 

 Malloch overlooked Enderlein' s paper, or he would also have 

 discovered that his genus Eucynipimorpha is a synonym of 

 Psephiocera Enderlein. 



