Vol. XVII 
1900 
DwiGutT, Moult of Quaiis and Grouse. 155 
two moults practically side by side, apparently in three parallel 
- bands, on the breast and abdomen may be traced in a number of 
specimens which illustrate it. A female (Amer. Mus. No. 26169, 
Labrador, September 5) has assumed wings almost wholly white ; 
the third primary is a mere pin point, its brown juvenal covert 
still retained, and the inward course of the moult has reached the 
eighteenth remex. The new white one is just visible, the seven- 
teenth half. grown, and the inner members are as yet unmoulted. 
The median coverts and a few dusky lesser coverts are still re- 
tained. New white feathers are growing among the axillaries and 
upon the flanks and abdomen at the places where they regularly 
develop. Four other birds (L. B. Bishop, No. 4504, 9, No. 
4505,d, No. 4507,¢, and No. 4509,¢, Alaska, August 28) are 
at about the same stage or slightly more advanced. The third 
primary of each is now white and one half grown while they still 
retain a brown feather of the alula and some brown ones of the 
carpo-metacarpal border. In two others (L. B. Bishop, No. 
4502,d, and No. 4508,@, Alaska, August 28) the white of the 
sternal bands is more prominent and the tails a little longer. 
A female (L. B. Bishop, No. 4597, Alaska, Sept. 11) is still 
further along, white feathers beginning to appear about the chin 
and throat. Another bird (L. B. Bishop, No. 4657, Alaska, Sept. 
19) has become almost wholly white on the abdomen except a few 
feathers of the flanks, and new white feathers of the supplemen- 
tary winter dress are growing at the usual initial points of 
development on the breast, throat, chin, head and back. Three 
more (L. B. Bishop, No. 4655, ¢, No. 4656, 9, and 4658, 9, 
Alaska, Sept. 19) differ little from the last although the white 
middle pair of tail-coverts is now in sight taking the place of the 
juvenal feathers. A specimen evidently a//eni (Amer. Mus. No. 
45195, wrongly labelled ‘“‘ Nova Scotia, summer”) illustrates the 
full development of the preliminary winter plumage, the wings 
being absolutely white although the inner remiges show signs of 
recent growth. The upper parts and breast are almost wholly of 
the reddish second type of feather, the abdomen wholly white, as 
are the flanks, legs and toes. 
first Winter Plumage (supplementary), acquired by a partial 
supplementary postjuvenal moult, which beginning at the usual 
