No. 533] INHERITANCE IN COLIAS PHILODICE 267 



5. Yellow daughters of a white female are probably all 

 homozygous for yellow. 3 "When crossed with certain of 

 their brothers, presumably heterozygous for color, these 

 yellow females produce both yellow and white female 

 offspring, sometimes in equal numbers, in accordance 

 with Mendelian expectation (broods e, f, k), but some- 

 times twice as many white as yellow (brood i). 



6. Yellow homozygous females, daughters of a white 

 female, when mated with other brothers presumably 

 homozygous produce onlv yellow offspring (brood 2 v. 

 1909). 



2. Inheeitance in Colias Edusa 

 The numbers of typical orange and of white females of 

 the European Colias edusa obtained by Frohawk (1901) 

 from the eggs of four wild white females (var. helice), 

 viz., 110 white 22 (helice) and 125 orange ?$ (edusa) 

 with 302 are in approximation to equality, and point 

 to the conclusion that, in this species also, the white 

 female is heterozygous for color. 



Harrison and Main (1905) raised from the eggs of a 

 white female (helice) of this species 79 SS, 52 22 helice 

 (white), and 19 22 edusa (orange). The numbers indicate 

 that in this case both the parents wore probably heterozy- 

 gous for color. All the male offspring were of the typical 

 orange hue, so it may be assumed that the 25 per cent, of 

 homozygous white males that would be expected from 

 mating two heterozygotes together were aborted, though 

 the numbers indicate that 25 per cent, of the females were 

 homozygous in whiteness. The expectation in the distri- 

 bution of the observed number (71) of females would be 



