XXxii. '21] ENTOMOLOCK A! N KWS 311 



Some Notes on Drosophilidae (Diptera). 



By J. R. MALLOCH. 



Several years ago whi'e working on the immature stages of 

 Diptera J undertook to arrange and extend the materials in 

 the family Drosophilidae belonging to the collection of the 

 State Natural History Survey of Illinois, and part of that work 

 consisted of making keys to the genera. Shortly after I started 

 the work I was informed of the more extensive work which 

 Dr. Sturtevant had undertaken and dropped mine, at least 

 insofar as it was intended for publication. Recently I received 

 from Dr. Sturtevant a copy of his paper on Drosophilidae* and 

 present the following notes on some of the genera as an addi- 

 tion to our knowledge of the family. 



STEGANA Meigen. 



Sturtevant has united this genus with PJiortica Schiner in 

 his paper. Though the characters usually cited for their sep- 

 aration are, as he says, unreliable, there are other characters 

 present that, in my opinion, warrant the retention of Phortica 

 as a separate genus. 



In Stcyana the frontal lunule is transverse above, the suture 

 extending in a straight line almost from eye to eye above bases 

 of antennae, while in at least the American species of Phortica 

 it is arcuate above and indistinct except centrally ; the mid tibia 

 has some very noticeable setulae on posterodorsal surface 

 which are not developed in Phortica; the scutellum is slightly 

 flattened above, not regularly rounded, and elongate, while in 

 Phortica it is convex, short and evenly rounded ; and the second 

 wing-vein is curved forward rather abruptly to costa at its 

 apex, whereas in Phortica it is straight to apex, gradually ap- 

 proaching costa. 



I took a single female of the genotype, colcoftrata Scopoli, on 

 a tree-trunk at Urbana, Illinois, Julv 23, 



PHORTICA Schiner. 



Sturtevant unites Loew's two species in bis paper, stating 

 that an extensive series "shows graded color variations com- 

 pletely connecting these two extremes," and that he can find no 



*Publication 301, Carnegie Institution, Washington, 1921. 



