32 
SPECIMENS EXAMINED 
III 
Spring Males 
Yellow Group 
38. 
N.M.C. 
8785 
Bernard harbour, N.W.T 
• July 
7, 
1915 
39. 
a 
7933 
Collinson pt., Alaska 
June 
18, 
1914 
40. 
u 
7955 
if 
July 
4, 
1914 
41. 
if 
7968 
if 
.July 
7, 
1914 
Largely white 
if 
Partly white 
IV 
Spring Males 
Grey Group 
(None) 
This plumage is barred much as is that of the spring female, but the 
barring is much finer, almost to vermiculation, and the black elements in 
the coloration predominate, making a much darker general effect. The 
birds listed are much alike and carry considerable rusty ochre in their 
plumage, but there are no spring males in the collection representing 
the grey form. I assume these belong to the yellow group, from geo- 
graphical considerations and because they look as would be expected of it. 
It is notable that the male rock ptarmigan does not moult into spring 
plumage until considerably later than the female. We have birds as late 
as July 2 that are still in almost complete white winter plumage. During 
the moult the males become retiring, secretive, and difficult to find, which 
explains their comparative scarcity in collections. 
SPECIMENS EXAMINED 
V 
Autumn Females 
Yellow Group 
42. N.M.C. 18770 Godhavn, Greenland July 30, 1923 
43. M.C.Z. 48440 Disko is., Greenland Sept. 2,1899 
44. N.M.C. 7112 Melville is., Frank Aug. 16,1909 
45. “ 9874 Kay pt., Yukon Aug. 17,1914 
46. “ 9946 Bathurst inlet, N.W.T Sept. 6,1915 
VI 
Autumn Females 
Greyish Group 
47. 
M.C.Z. 
233363 
Disko, Greenland 
. Sept. 
1, 1925 
48. 
N.M.C. 
20217 
Pangnirtung, Baffin is 
. Sept. 
27, 1924 Nearly white 
49. 
fi 
20206 
if 
10, 1924 
50. 
M.C.Z. 
34812 
Newfoundland 
51. 
if 
10727 
Codroy, Newfoundland 
3, 1895 
52. 
if 
53607 
Newfoundland 
. Sept. 
16, 1910 
