BRITISH COLUMBIA AND HYPOTHETICAL LIST. 977 



Okanagan district in about equal numbers, as is proved by a series collected b\- 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. 



B. C. & H. No. 20. 



LONG-T-'\ILED JAEGER. 



A. O. U. No 38. Stercorarius longicaudus ^'ieill. 



Description. — Adult: Top ui hcail. 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; tibia; 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 lo.oo-fo.oo, the lateral 

 tail-feathers about b.25 ; wing 13.50; bill 1.18; tarsus 1.60. 



Recognition Marlts. — 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 chiefly within the .Arctic circle; 

 irregularly south in winter tn the northern border of Uuited States, casually to California 

 and Gulf of Mexico. 



Occurrence in British Columbia. — This bird is a scarce though regular fall migrant 

 down the lower Eraser 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. L'. No. 42. Larus hyperboreus Gunneru^. 



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. In xcintcr: Iris golden yellow; bill and feet paler than m summer; 

 head and hind-neck lightly touched with pale brownish gray. Immature: Sordid white, 

 shaded below with brownish and slightly mottled al-.ove with pale reddish brown ; bill flesh- 

 colored, tipped with black — always the whitest of local young gulls. Length of adult: 

 2:.co-32.co; wing 17.00-18.50; tail 8.00: bill 2.50-3.CO. depth at nostril .80; tarsus 3.00-3.25. 



Recognition Marks. — Largest of local giflls; plumage almost wdiite 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 Dec. 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 Icticoptcrus of which there is no western 

 record. 



Supposed Occurrence in Washington. — Large white birds which are almost certainly 

 inunature specimens of true gluuius are occasionally seen in winter on Puget Sound but in 

 default of specimens we have oreferred 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. & H. No. 22. 



IVORY GULL. 



A. O. U No 30 Pagophila alba (Gunn.). 



Description. — Adult: Plumage entirely pure white, the shafts of the primaries straw 



