GENE MUTATIONS 



Viability of males is about fifty per cent that 

 of their wild-type sibs. (Discarded.) 



BAR-EYES, be (eyes). W. F. Dunning (1931) re- 

 ported on another eye mutation, which she 

 called bar-eyes, a recessive mutant type. Males 

 are fertile, but 121 tested females proved 

 sterile. (Discarded) 



CRESCENT, cr (eyes). In August, 1931, an eye 

 mutation affecting both ocelli and compound 

 eyes appeared in a fraternity of 35 males. The 

 compound eyes are slightly smaller than normal, 

 and the ocelli are crescent-shaped. Crescent 

 is of normal viability and fertility in the 

 male, but fertility seems slightly reduced in 

 females. 



PEBBLED, pb (eyes). In March, 1932, five males^ 

 of a fraternity had a new eye character, peb- 

 bled, with facets irregularly arranged and eyes^ 

 somewhat smaller than normal. Pebbled males' 

 are rather small and they mate with difficulty. 

 The females are weak or sterile. Viability of 

 males is normal. (Discarded) 



BULGE, bu (eyes). In this mutant type the com- 

 pound eyes are abnormally bulged transversely. 

 Both sexes are fully fertile with normal via- 

 bility. 



Mutations for body color have not been aS' 

 numerous as have those for eye color. The 

 wild-type individuals vary in color from honey- 

 yellow to almost black, depending upon the tem- 

 perature at which they are reared; the higher 

 the temperature, the lighter the color. During 



95 



