OF WASHINGTON. 51 



Last summer the following specimens were taken in this 

 vicinity all at light except one which evidently had come to 

 light the previous evening : Mr. Schwarz captured a male on 

 Plummer's Island, Md., on June 19. Mr. Busck took one male 

 and two females, and saw a fourth example all within three 

 or four minutes of each other on Plummer's Island, September 

 9, about 10 o'clock in the evening. He found another female 

 at the same place about 7 P. M. on September n, and still 

 another female, dead but still soft, in his house at Langdon, 

 D. C., September 18, 1903. 



We now have records, therefore, of sixteen specimens seven in 

 the National Museum Collection ; two in Mr. Bank's Collection ; 

 one, the type, in the British Museum ; three in the collection 

 of the Museum of Comparative Zoology at Cambridge, Mass. ; 

 one in Mr. Cook's Collection and, lastly, the two missing speci 

 mens from the Fitch Collection. 



The following article was presented for publication : 



"THE GENERA OF THE DIPTEROUS FAMILY EMPIDIDiE." 



(ADDENDA.) 

 By D. W. CoqyiLLETT. 



In the paper under the above heading, which appeared on 

 pages 245 to 272 of Volume Vof these Proceedings, it was stated 

 several times that the writer had been unable to consult a copy 

 of Macquart's " Insectes Dipteres du Nord de la France," separate 

 edition. This work has recently been obtained for the library of 

 the U. S. Department of Agriculture by the efficient Librarian, 

 Miss Josephine A. Clark, and I am thus enabled to make the 

 following supplementary remarks and corrections to the article 

 in question : 



Page 246, under Ardoptera. Macquart mentioned only the 

 one species given in his later work. 



Page 249, under Elaphropeza. Only the single species was 

 mentioned. 



Page 252, Leptopeza should be Lemtopeza ; only the one 

 species was mentioned by Macquart. 



Page 2^3, under Microphorus. Three species were described, 

 the second being velutinus. 



Page 255, under Platy palpus. Eighteen species were de 

 scribed, of which cursitans was the fourteenth. 



The data given in my paper in regard to this separate edition 

 were chiefly derived from Macquart's later works ; several of these 



