No. 644] MUTANT CHARACTERS IN DROSOPHILA 



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sometimes the third vein is entire (Fig. 13). 

 The second vein is shorter than any of the others. 

 Ordinarily, the distance between the ends of the 

 veins and the margin is not great. The posterior 

 cross-vein is broken occasionally. 



15 16 



Figs 10-16: Fig. 10. triple. Fig. 11, square. Fig. 12, stump. Fig. 13. 

 short Fig. 14, Bhort-2 ^. Fig. 15. short-3 ^. Fig. 16, nicked. 



On>m.— Short was first observed in half the sons of 

 a single female indicating that the mother was hetero- 

 zygous for the short gene. This female carried orange 



