[463] DIPTERA 77 



tomyza have been rather vague and obscure, and in consequence the 

 last-named genus has not been generally adopted. A recent study of 

 this group has disclosed a well-marked difference in the disposition of 

 the short, bristly hairs of the mesonotum ; in Scaptomyza these hairs 

 are sparse and are arranged in two or four nearly regular rows, while 

 in Drosophila as restricted they are numerous and not arranged in two 

 or four rows. This difference, taken in connection with the widely 

 divergent habits of the larvse — leaf-miners in Scaptomyza, scavengers 

 in Drosophila — ^will justify the separation of these two forms into two 

 distinct genera. -_^' '^ 



Family OSCINH)^. 

 Oscinis carbonaria Loew. 

 Oscinis carbonaria Loew, Berliner Ent. Zeitsch., p. 42, 1869. 



Metlakahtla, June 4 ; Popof Island, July 8 to 12; Juneau, Alaska, 

 July 26 : Seven specimens. Originally described from the District of 

 Columbia, and has been reported to occur from New Jersey to Ne- 

 braska, and northward to Canada. 



Chlorops sahlbergi Loew. 



Chlorops sahlbergi hO'E.^ , Berliner Ent. Zeitsch., p. 51, 1863. 



Muir Inlet, June 1 2 ; Virgin Bay, June 26 ; Saldovia, Alaska, July 

 21 : Five specimens. Originally described from Alaska. 



Chlorops producta Loew. 



Chlorops producta Loew, Berliner Ent. Zeitsch., p. 52, 1863. 



Sitka, Alaska : A single specimen, collected June 16. The type 

 specimen also came from Sitka. 



Chlorops scabra Coquillett. 



Chlorops scabra Coquillett, Journal New York Ent. See, p. 46, 1898. 



Saldovia, Alaska : A single specimen, collected July 21. Originally 

 described from Oswego, N. Y. 



Family AGROMYZD)^. 

 Rhicncessa parviila Loew. 

 Rhicnoessa parvula Loew, Berliner Ent. Zeitsch., p. 45, 1869. 



Kukak Bay, July 4 ; Saldovia, Alaska, July 2 1 : Two specimens. 

 Originally described from Rhode Island. 



Agromyza neptis Loew. 



Agromyza neptis Loew, Berliner Ent. Zeitsch., p. 50, 1869. 



Juneau, Alaska : Two specimens, collected July 25. Originally de- 



