188 University of California Publications in Zoology. [Vou.9 
May 1, and a female (No. 54), Glacier Bay, June 28, show a 
curious admixture of white and sooty brown feathers over the 
whole body, giving a mottled appearance. A close examination 
shows that this condition is not due to an active transition from 
a white winter to a dark summer plumage, as might be inferred 
to be in process, for I fail to find pin-feathers. While a good 
many feathers are either wholly white or wholly dark, a number 
in both specimens, especially on the back, are parti-colored. 
Uria troile californica (Bryant). California Murre. 
The only murre taken was secured at Windfall Harbor, Ad- 
miralty Island, May 16. It is a male (No. 69) in transition from 
winter to summer plumage, the throat, neck, and sides of head 
being mixed dark sepia and white. A few others were seen there. 
The species was noted elsewhere but. once: a single individual 
was seen by Littlejohn on Glacier Bay, July 11. 
Stercorarius parasiticus (Linnaeus). Parasitic Jaeger. 
On Glacier Bay, June 29 to July 14, this species was noted 
in small numbers. Most of them were seen harassing a flock of 
arctic terns, compelling the latter to disgorge the small fish 
which they were eatching at the mouth of a stream. Dixon saw 
a pair of jaegers around South Marble Island, July 5, which 
kept chasing a duck hawk. Stephens saw two jaegers on Bear 
Bay, Baranof Island, the last of August. 
Five skins of the parasitic jaeger (Nos. 228-232) were se- 
cured by the expedition in Glacier Bay, June 29 to July 14. All 
are in the dark phase of plumage. Number 230 shows several 
lighter dusky-barred winter feathers in the plumage of the lower 
surface. 
Rissa tridactyla pollicaris Ridgway. Pacifie Kittiwake. 
A flock of several hundred kittiwakes was encountered among 
the floating ice on Glacier Bay July 13, and two immature- 
plumaged specimens were secured (Nos. 81, 82). <A flock of 
about a dozen hung about the camp at Idaho Inlet, Chichagof 
Island, July 20 to 25; and Stephens saw several kittiwakes over 
a tide-rip in Bear Bay, Baranof Island, the last week in August. 
