214 



THE SECOND-CHROMOSOME GROUP 



Thht-pigure 77. — Vestigial-an tiered compounds. Fig. 776 shows the compound male, wbich 

 usually has a longer wing than the corresponding female, fig. 77 a. 



female indistinguishable from pure vestigial in fully 90 per cent of the 

 flies, and in the remainder is intermediate in type (fig. 77, a), and while 

 distinguishable from pure vestigial, grades off toward the pure ant- 

 lered type. In the males from 40 to 60 per cent of the compounds show 

 enough antlered characteristics to be separable from vestigial, and they 

 approach still closer in type to the pure antlered (fig. 77, h). 



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