1909] The 1907 Alexander Alaska Expedition. 187 
less profusely there than along the sides and across the chest. 
Both sexes are represented and about evenly; external sexual 
differences are not apparent. All are surely in full nuptial 
plumage, though the less-heavily marked individuals in that re- 
spect show less departure from what is described as the winter 
plumage; but I have never seen this. Dorsally there is some 
variation in the amount of cream-buff streaking. Coues says 
(Key, 5th Ed., 1903, page 1077), ‘‘no white on scapulars’’; but 
there certainly is in the majority of specimens a conspicuous 
amount of mixed white and buff in the scapular region. 
Cepphus columba Pallas. Pigeon Guillemot. 
The pigeon guillemot was found extensively distributed along 
the straits and channels among the islands. It was common at 
Windfall Harbor, April 26 to May 19, and at Mole Harbor 
May 19 to June 10. It was often seen in pairs at Hooniah, June 
21 to 27; but a pair shot, according to Dixon, were both males. 
Stephens saw several at Idaho Inlet, July 20 to 25; and at Rod- 
man Bay, August 12 to 20, single birds were occasionally seen. 
At Hawk Inlet, north end of Admiralty Island, Dixon noted it 
commonly August 1 to 9. On Glacier Bay from June 27 to July 
20, pigeon guillemots were common, being noted singly and in 
small flocks. 
Dixon found a number nesting on South Marble Island, 
Glacier Bay, July 5, at which date eggs were fresh or but moder- 
ately incubated. The eges were laid on the bare rock or on piles 
of broken rocks in erevices back under boulders. Two sets of 
two eggs each and three single eges were taken. These seven 
eges show the usual variation in markines and ground color de- 
scribed of this species. The ground is pale cream color to pale 
olive buff, with bold markings of bistre to burnt umber, and 
shell markings of ecru drab to drab-gray. These markings are 
in the nature of blotehes and well-defined spots, mostly at the 
large ends, or in a ring about the large ends. Two extreme 
sizes are, 63 < 43.6 and 59.5 < 41.7. 
Five skins (Nos. 37, 38, 44, 45, 54) of the pigeon euillemot 
were obtained, from Admiralty and Chichagof islands and from 
Glacier Bay. Two of these, a female (No. 38), Windfall Harbor, 
