SEX-LINKAGE IN FOWLS 501 
Another quite new type of males occurred—the duckwing. 
This type has the Leghorn or Jungle fowl pattern, with black- 
striped straw-colored neck and saddle, white wing-bay, red 
shoulders and back, black primaries, tail, and wing coverts, 
and mainly black breast, though a little white and some brown 
shows here. Now pure Brown Leghorn males occasionally show 
some brown on the breast, and some of the white on the only 
specimen of the above class examined in adult plumage is proba- 
bly due to the fact that he was sick when young, and did not 
grow well (but see letter from Mr. Westfall quoted below). 
Therefore I believe this male is a brown with white or straw- 
white substitut d for red and yellow in neck, saddle, and win - 
bay. 
There are two types of duckwing females. One, the silver 
gray, is the color of the Brown Leghorn female, with all the 
brown or yellow except that of the breast, replaced by white 
or light gray. This replacement is, however, incomplete on the 
back and wings. This is the color of the Silver Duckwing Game or 
Leghorn, and of the Silver Gray Dorking. I have seen brown in 
the above mentioned regions on exhibition specimens of two of 
these breeds. What I have called the brown duckwing female 
has the yellow replaced by white only in the neck. I know of 
no breed where this condition appears (but see statement in 
letter from Mr. Westfall, quoted below.) 
The presence of these two types of females suggests that there 
should be two types of duckwing males. Perhaps one type 
should be like the Silver Gray Dorking or the Dark Brahma 
males, which have the Brown Leghorn color with all brown and 
red replaced by white. Or perhaps there should have been 
golden duckwings, that is some with straw-colored wing-bay, 
as well as neck, back, saddle, and wing-bow. I had five duck- 
wing males, but raised only one to maturity. The last time I 
examined the others they were not quite three months old. At 
that time all five looked about alike in color, and my notes regard- 
ing them are as follows: necks black and white; backs red, 
slightly stippled with black, straw-colored saddle feathers begin- 
