14 
THE NORTH AMERICAN SPECIES OF DROSOPHILA. 
D. funebris: Two papers: Sturtevant (1918), Mohr and Sturtevant (1919). 
These papers, and certain unpublished data of my own, indicate 
the existence of at least 5 mutations, in at least three different 
chromosome pairs. Three of these are probably identical with 
mutations previously discovered in D. melanogaster; two of the 
latter are in the same (the X) chromosome pair, and show a linkage 
relation similar to but not identical with that shown by the same 
two genes in D. melanogaster. 
. hydei: Hyde (1915) recorded a non-sex-linked recessive eye-color in this 
species. The form had not then been distinguished from D. 
repleta, and Hyde used that name for it. 
. mmigrans: Metz and Metz (1915), using the name D. tripunctata, 
recorded a non-sex-linked recessive venation character. I have 
found about five mutations in this species, lying in at least three 
different chromosome pairs. One of them has appeared in two 
entirely different stocks, caught wild in widely separated localities. 
(Unpublished data.) 
. obscura: I have found a non-sex-linked recessive, “‘spread’”’? wing (un- 
published data). Metz (1916) has recorded three mutations in 
this species—one sex-linked and two not. Mr. D. E. Lancefield 
has unpublished data on numerous mutations in this species. 
. repleta: A sex-linked body-color occurs in nature (Sturtevant, 1915). 
The data published concerning the distribution of this form need 
revision, as they were based on classifications of material that 
included D. hydei and D. mulleri, as well as D. repleta. It is 
certain that the rarer type occurred in New York and in Arkansas; 
but all the other records are doubtful. I have more recently 
obtained two other mutations in this species, but neither of them 
was favorable for extensive study (unpublished data). 
similis: Metz (1916) has studied a non-sex-linked recessive eye-color 
called ‘‘chocolate.”’ 
. simulans: The first mutant in this species was found in the wild state 
by Dr. C. W. Metz. I have found about ten others since then; 
five of these mutants have been crossed with similar mutant 
races of D. melanogaster, and have thereby been shown to be due 
to changes in the same genes as in that species. Four of these are 
in the X chromosomes, and have the same sequence in the two 
species. Linkage between sex-linked genes, non-disjunction of the 
sex chromosomes, and gynandromorphism have all been shown to 
occur here and to be closely similar to the same phenomena in 
D. melanogaster. All the data on this species are still unpublished. 
. virilis: Metz (1916, 1917, 1918) has studied this species in some detail. 
He has reported 16 mutations, 8 of which are sex-linked, and has 
determined the positions of the latter on the X chromosome. At 
least three groups of genes are represented. Three of the muta- 
tions appear to be the same as previously known ones in D. 
melanogaster. 
. willistont: Dr. Metz has unpublished data on a number of mutations in 
this species, and on their interrelations. 
