BRUISE COFUNBTACAN DELP © Tete i@ATe TIS Ir: 977 
Okanagan district in about equal numbers, as is proved by a series collected by myself in the 
past four years. Neither breed, though young with down still adhering have been taken. 
The typical form is also of regular occurrence at Chilliwack on the west side of the Cascade 
Mountains during the migrations. 
Occurrence in Washington.—Must traverse the State during migrations en route to 
northern breeding grounds. 
BinGecuhicnNOs20- 
LONG-TAILED JAEGER. 
A. O. U. No, 38. Stercorarius longicaudus Vieill. 
Description.—Adult: Top of head, including eyes and lores, black; remainder of head 
and neck abruptly white (narrowly above, on occiput only) tinged save on chin and throat 
with straw-yellow; underparts white; remaining upperparts deep slaty, changing on remiges 
and lateral tail-feathers to lustrous black; wing-linings and under, surface of tail slaty ; 
central pair of tail-feathers greatly produced, 8-10 inches beyond lateral feathers, blackening 
distally. Bull dusky; tarsi leaden-blue; tibize and feet. black. There is a dark phase wherein 
the entire plumage becomes slaty or sooty, as in other species of Jaegers, but this is very 
rare, almost negligible. Length of adult 20.00-23.00, of which the tail 10.00-16.00, the lateral 
tail-feathers about 6.25; wing 13.50; bill 1.18; tarsus 1.60. 
Recognition Marks.—Small crow size; smaller in body than the Parasitic Jaeger; the 
greatly lengthened and tapering central pair of tail-feathers distinctive. 
General Range.—The northern hemisphere, breeding chieHy within the Arctic circle; 
irregularly south in winter to the northern border of United States, casually to California 
and Gulf of Mexico. 
Occurrence in British Columbia.—This bird is a scarce though regular fall migrant 
down the lower Fraser Valley, being usually seen about the time of the autumnal equinox. 
I have seen birds at Sumas headed straight south, so that their occurrence in Washington is a 
certainty. It also occurs occasionally in fall at least upon the lakes of the interior and I 
have taken specimens at Okanagan. Only white-breasted adults and pale-colored young have 
been seen at any time and this entire absence of melanistic individuals I have found to be 
characteristic of parasiticus as well. 
B. C. & H. No. 21. 
GLAUCOUS GULL. 
A. O. U. No. 42. Larus hyperboreus Gunnerus. 
Description.—Adult in summer: Mantle pale pearl gray; remaining plumage pure 
white; primaries entirely white or pale gray basally fading into white on tips, their shafts 
straw-yellow. Bill chrome yellow with vermilion spot at angle; feet and legs livid flesh- 
color; iris light hazel. Jn winter: Iris golden yellow; bill and feet paler than in summer; 
head and hind-neck lightly touched with pale brownish gray. Jmmature: Sordid white, 
shaded below with brownish and slightly mottled above with pale reddish brown; bill flesh- 
colored, tipped with black—always the whitest of local young gulls. Length of adult: 
2°,00-32.c0; wing 17.00-18.50; tail 8.co; bill 2.50-3.00, depth at nostril 80; tarsus 3-00-3.25 
Recognition Marks.—Largest of local gulls; plumage almost white above; primaries 
with tips broadly white distinctive. 
General Range.—Northern and Arctic seas, circumpolar; south in winter in North 
America casually to San Francisco, the Great Lakes and Long Island. 
Occurrence in British Columbia.—One immature bird taken at Comox Dee. 15th, 1903. 
Large white-winged gulls either of this species or one of its congeners are frequently seen 
on Okanagan Lake, but these seem more the size of Ie ucopterus of which there is no western 
record. 
Supposed Occurrence in Washington.—Large white birds which are almost certainly 
immature specimens of true glawcuws are occasionally seen in winter on Puget Sound but in 
default of specimens we have preferred to enter them here. There is no rumor of the 
appearance of adults hereabouts but those which have been recorded from the California 
coast doubtless passed along our western shores. 
B.C. & He Nos 22: 
IVORY GULL. 
A. O. U. No. 39. Pagophila alba (Cunn.). 
Description.—Adult: Plumage entirely pure white, the shafts of the primaries straw 
