Ferry, Lancefield and Metz: Mutations in Drosophila 381 



TWO MUTANT CHARACTERS AFFECTING THE LEGS 



Figure 21. Above are shown the three legs from the right side of the cone 

 mutant. The first tarsus is shortened and thickened, giving it a cone shape, and the 

 other tarsi are shorter than normal. Below are the three right legs of a fly 

 showing the character approximated. The first tarsal joint of each is absent, and 

 the others are shortened. This character also affects the wings (see Figure 17). 

 It is maintained by some that the Drosophila "mutants" are nothing but segregates 

 resulting from hybridization. This hypothesis is ruled out in the present case, as 

 D. IVillistoni occurs wild in Cuba, but is found no farther north than Florida. 

 The stock used here has been inbred for over 200 generations and throws mutants 

 as frequently as ever. 



