GEOGRAPHICAL DISTRIBUTION. 109 
mopolitan species (Drosophila buscku, D. funebris, D. immigrans, 
D. melanogaster, and D. repleta) are all recorded from this region. 
The following also occur in the Palearctic region: Avulacigaster leuco- 
peza, Chymomyza caudatula, Drosophila obscura, D. transversa, Scapto- 
myza graminum, and Stegana coleoptrata. Scaptomyza_ terminalis 
(Nearctic) and S. unipunctum (Palearctic) may perhaps be identical. 
The following species are both Nearctic and Neotropical: Chymomyza 
procnemis, Drosophila hydet, D. mullert, D. simulans, Leucophenga 
maculosa, and Pseudiastata nebulosa. Drosophila mullert 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 Illinois, 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: California. 
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 (Cladocheta nebulosa, Scaptomyza vittata, Drosophila cardini, 
D. lutziz, 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. 
