THE CANADIAN ENTOMOLOGIST. 51 



LIST OF DIPTERA TAKEN IN THE VICINITY OF PHILA- 

 DELPHIA FROM 1882 TO 1884, INCLUSIVE. 



BY E. L. KEEN, PHILADELPHIA, PA. 



The object of giving this Hst in its present imperfect form is to call 

 the attention of our Entomologists to this greatly neglected order of 

 insects, and as most of the families are still in an unworked condition, to 

 call especial attention to them ; of course, the named species represent 

 only about one fourth of all the species taken by me during my three 

 years collecting, and were mostly taken in Fairmount Park, and a few at 

 Delanco, N. J- 



If a few of our many Entomologists would turn their attention to the 

 Diptera, they would be sure to find an interesting and very wide field, in 

 fact there would be room enough for nearly a dozen systematic workers 

 in this order. 



At present the Diptera are receiving great attention from Dr. S. W. 

 Williston, who has already greatly advanced the study of the order, and 

 if we had a few more such workers, the Diptera would soon rise to as 

 honorable a rank as is held by Coleoptera, etc. 



Cccidomyidce. 

 Took a few species, but none are determined. 



Mycetoph ilidce. 

 Species undetermined. 



Simulidce. 

 Simulium venustum (?) Say. 



Bibio7iidce. 

 Bibio albipennis, Say. Bibio articulatus, Say, 



n femoratus, Wied. Scatopse atrata. Say. 



And several undetermined species. 



Culicidce. 

 Culex ciliatus, Fabr. Anopheles quadrimaculatus, Say. 



If taeniorhynchus, Wied. 

 Several other species were taken, but are undetermined. 



Chironomidce. 

 There are a large number of species of this family, but they are not 

 worked up. 



