STUDIES ON HYBRID DUCKS 



245 



TABLE 2 

 Fi pigmented females 



NOT INCLUDING BLACK 



INCLUDING BLACK 



Like Rouen 

 female 



Modified 



Like Rouen 

 female 



Modified 



Head 



Bill 



Chin spot 



Neck ring 



Breast 



Belly 



Primaries 



Upper surface of wing 

 Under surface of wing 



Speculum 



Legs and feet 



9 

 9 

 6 

 5 

 10 

 7 

 4 

 8 

 9 

 9 

 7 



21 

 22 

 53 

 %^ 

 1^ 

 44 

 74 



3* 



2^ 

 2« 

 47 



9 



11 



6 



7 



10 

 7 

 4 

 8 

 9 

 9 

 7 



21 28 



22 



7* 

 63 

 V 29 



9* 



3^ 28 

 45 



46 



47 21" 



1 Plain. 2 Nearly yellow. ' Present. * With much white. ' Pig- 

 mented. ^ Obscured. ^ With some black. 8 Black. ^ Pure white 

 1" Black and orange. 



also to be several other characters which are present in part of 

 the females and absent in the remainder, but which are either 

 always present or always absent in the male, I am not pre- 

 pared at present to speak definitely in regard to these characters 

 mainly because this peculiarity in their inheritance was not 

 noticed until the Fa generation was studied (tables 1 and 2) . On 

 the other hand, there are characters which are in only part of the 

 individuals, of each sex. Thus, white shading on the breast 

 and the white-red dorsal wing surface, as described for all but one 

 of the Fi males, are present in only part of the females. But I 

 have failed to find any character, which is present in only part 

 of the males, but which is always present or always absent in all 

 the females. The significance of these statements will be con- 

 sidered later on in the paper. 



The two greenish black individuals (fig, 7) with white throats 

 and breasts resemble strongly the variety of ducks known as 

 Blue Swedish, One died at an early age. The other shows 



