GEOGRAPHICAL DISTRIBUTION. 109 



mopolitan species {Drosophila busckii, D. funebris, D. immigrans, 

 D. melanogaster, and D. repleta) are all recorded from this region. 

 The following also occur in the Palsearctic region: Aulacigaster leuco- 

 peza, Chymomyza caudatula, Drosophila obscura, D. transversa, Scapto- 

 myza graminum, and Stegana coleoptrata. Scaptomyza terminalis 

 (Nearctic) and S. unipunctum (Palsearctic) may perhaps be identical. 

 The following species are both Nearctic and Neotropical : Chymomyza 

 procnemis, Drosophila hydei, D. mulleri, D. simulans, Leucophenga 

 maculosa, and Pseudiastata nebulosa. Drosophila mulleri is perhaps 

 better considered as a Neotropical species that occurs also in the 

 borderland between the two regions; but I have included it here 

 because it comes farther north than do most such species. Of the 45 

 species known from the region, this leaves only 28 as endemic. 



The distribution of the 11 Nearctic genera within the region is as 

 follows : 



Aulacigaster: New Hampshire to Illinois, Kansas, Texas, and Alabama. 



Chymomyza: New Hampshire to Washington, Texas, and Florida. 



Curtonotum: Vermont to " North Red River " and Georgia. 



Drosophila: Nova Scotia to British Columbia, California, and Florida. 



Leucophenga: Massachusetts to IlUnois, Kansas, Texas, and Florida. 



Mycodrosophila: New Hampshire to Illinois, Alabama, and Georgia. 



Pseudiastata: Maryland. 



Pseudophortica: Virginia to Tennessee, Texas, and Florida. 



Scaptomyza: Maine to Alaska, California, and Florida. 



Sinophthalmus : Cahf or nia . 



Stegana: Maine to Wisconsin, Arizona, and Florida. 



This region has perhaps been more thoroughly collected in than any 

 other, but our knowledge of the extreme northern part of it, and to a 

 less extent of the western part, is still very incomplete. The following 

 list, showing the species that are known from each of the States and 

 provinces, will serve to illustrate this point. There are seven States 

 from which no species at all are known: Delaware, Kentucky, Ne- 

 braska, North Dakota, Montana, Utah, and Nevada. Only a few 

 States can be considered as at all thoroughly explored. It is likely 

 that the list is fairly complete for New York, Alabama, Maryland, 

 Massachusetts, Virginia, Indiana, New Hampshire, New Jersey, and 

 Illinois. Florida is credited with more species than the two last 

 named, but the Florida list as it stands includes five strictly Neotropical 

 species {Cladochceta nebulosa, Scaptomyza vittata, Drosophila cardini, 

 D. lutzii, and D. willistoni). 



Alabama: Alabama — continued. Alabama — continued. 



Aulacigaster leucopeza. Drosophila affinis. D. melanogaster. 



Pseudophortica obesa. D. alabamensis. D. putrida. 



Leucophenga varia. D. busckii. D. quadrata. 



L. maculosa. D. funebris. D. robusta. 



Chymomyza amcena. D. guttifera. D. sigmoides. 



C. procnemis. D. hydei. D. simulans. 



Mycodrosophila dimidiata. D. immigrans. D. transversa. 



Scaptomyza adusta. D. melanica. D. tripunctata. 



S. graminum. D. melanissima. 



