442 ANNA R. WHITING. 



biparental males show three dominants, two from the mother, one 

 from the father. 



Class c is likewise of special interest. Recessives d and r are 

 contributed by the mother, o' and w by the father. Biparental 

 males are orange, non-defective (with one exception slightly so), 

 non-wrinkled, and non-reduced. Here again the wings of bi- 

 parental males show three dominant characters, two from the 

 father and one from the mother. In class d three females hetero- 

 zygous for o and o 1 , homozygous for W and r, are mated to owR 

 males. All ivory males have reduced wings while among the 

 orange males are the biparental males easily recognized by their 

 non-reduced wings. 



In all, four hundred and eighteen matings were made where 

 female parent had recessive eye color, male dominant. 747 bi- 

 parental males were produced in addition to 16,660 impaternate 

 males and 12,901 females. 



One hundred and thirty-five matings of defective females by 

 non-defective males gave 307 biparental males, 6,325 impaternate 

 males and 3,816 females. Defectives were recorded in one hun- 

 dred and two of these matings. 30 defectives were found among 

 269 biparental males, 11.15 1.29 per cent.; 4,744 among 5,159 

 impaternate males, 91.95 + 0.25 per cent.; 175 among 3,085 fe- 

 males, 5.67 2.81 per cent. 



Three matings of ww females by W males gave 5 biparental 

 males, I wrinkled, 43 impaternate males, all wrinkled, and 93 

 normal females. 



Fifty-one matings of rr females by R males gave 61 biparental 

 males, 462 impaternate males and 754 normal females. 



TESTS OF BIPARENTAL MALES. 



Table II. gives summary of tests of biparental males. When- 

 ever possible they were tested by mating to homozygous recessive 

 females. Individual males were often mated to several females. 

 Since they produce but few daughters the results of a large amount 

 of work seem meager. 



Two hundred and forty-two males were tested. One hundred 

 and ninety-seven or 81.40 1.69 per cent, were found to be 

 sterile. Of these, one hundred and thirty-nine were tested once. 



