35 
SPECIMENS EXAMINED 
X 
Juveniles 
Yellow Group 
79. M.V.Z. 9796 Port Snettisham, Alaska Aug. 29,1909 Full autumn 
80. Bent 1867 Lance au Loup, Labrador Sept. 9,1917 “ 
81. U.S.N.M. 94433 Ft. Ckimo, Ungava ....Aug. 26,1882 “ 
82. N.M.C. 18851 Ponds inlet, Baffin is.. Aug. 27,1923 Half grown 
83. “ 18858 “ Sept. 1, 1923 
84. “ 16292 De Haven pt., Victoria is Aug. 25,1918 Near down 
85. “ 16293 “ Aug. 25, 1918 
86. “ 16294 “ Aug. 25, 1918 
87. “ 16295 " Aug. 25,1918 
88. M.C.Z. 205491 Anticosti is., Que July 10, 1881 Downy 
XI 
Juveniles 
Grey Group 
89. 
N.M.C. 
20947 
Nettilling I., Baffin is 
Aug. 
24, 1925 
Nearly fledged 
90. 
tt 
20948 
it 
Aug. 
27, 1925 
it 
91. 
tt 
20949 
tt 
Aug. 
27, 1925 
it 
92. 
n 
20946 
tt 
Aug. 
21, 1925 
a 
93. 
tt 
20945 
it 
Aug. 
21, 1925 
it 
94. 
U 
21148 
Amadjuak bay, Baffin is ... . 
. . . Aug. 
7, 1926 
Half grown 
95. 
tt 
21149 
it 
Aug. 
7, 1926 
if 
96. 
tt 
21150 
it 
Aug. 
7, 1926 
it 
97. 
P.A.S. 
26961 
Disko, Greenland 
July 
8, 1891 
it 
98. 
tt 
26962 
« 
. . .July 
8, 1891 
it 
99. 
N.M.C. 
20934 
Amadjuak, Baffin is 
. . . Aug. 
1, 1925 
Quarter grown 
100. 
a 
20935 
it 
Aug. 
1, 1925 
if 
101. 
tt 
20940 
it 
Aug. 
20, 1925 
it 
102. 
tt 
20922 
Nettilling 1., Baffin is 
July 
26, 1925 
Near down 
103. 
tt 
20923 
it 
July 
26, 1925 
it 
104. 
it 
20921 
it 
July 
26, 1925 
it 
105. 
tt 
21115 
Cape Dorset, Baffin is 
. . .July 
20, 1926 
Downy 
The juvenile on leaving the down goes into a plumage much like that 
of the autumn female, but less sharply defined in pattern. Towards the 
end of the season considerable fine vermiculation appears in the back, but 
the breast remains distinctly barred. There is a moult of the wing quills 
during the summer when the greyish or dusky ones of the newdy fledged 
juvenile are replaced by the pure white ones of the coming winter. When 
other evidences of immaturity are not plain the presence of a few remain- 
ing grey wing quills may establish the undoubted juvenility of a specimen. 
The distinction between these two groups is not very strongly marked, 
but is discernible in most individuals and in mass it is convincing. It is 
evident from the newly hatched downy right through to the late autumn 
bird going into its first winter’s whiteness. 
