No. 598] CHROMOSOME STUDIES OX THE DIPTEBA 



599 



Several of the species contained in this survey have 

 been, or are being used in genetical studies. With the 

 exception of the well-known I), ampclophihi these are in- 

 cluded in the following list, together with references to 

 literature dealing with them, so far as known to me: 



D. repleta, type H., Sturtevant, '15, Hvde, '15. 



D.affinisAy^J. Hyde, '15. 



D. tripunctata. type I). Met/ and Met/., '15. 



D. virilis, type F. Met/ and Metz, '15. 



D. similis, type F. In press. 



D. obscura, type I. In press. 



