ey ASHINGTON HYPOTHETICAL LIS 983 
Occurrence in Washington.—lf migratory (and valid) will undoubtedly occur along 
our coasts. 
H. No. 42. 
MEW GULL. 
A. O. U. Hypothetical List. Larus canus Linn. 
Description.—Very similar to L. brachyrhynchus (q. v. p. 738) but with wing averaging 
longer and bill stouter; “bluish bases of primaries darker, not fading into white at their 
junction with the black, not running so far along the feathers, nor farther in the centers than 
along edges of inner webs” (Coues). 
General Range.—Northern Europe and Asia; of doubtful occurrence along the Pacific 
Coast in winter. 
H. No. 43. 
GULL-BILLED TERN. 
A. O. U. No. 63. Gelochelidon nilotica (Hasselq.). 
Synonym.—MarsuH TERN. 
Description.—Adult in summer: Top of head and nape black; remaining upperparts 
light pearl-gray; primaries silver-gray over dusky, blackening on tips but with 1vory-white 
shafts, and with some white on inner edge of inner web, the amount of white decreasing 
inwardly; tail slightly forked; remaining plumage white; bill rather short and stout, with 
conspicuous angle. and culmen decidedly curving toward tip,—hence like a Gull’s—black; 
feet blackish. Adult in winter: Similar, but head and neck white with dusky gray spots 
before eye and on ear-coverts and grayish suffusion on hind-neck or with traces of black cap 
in variable proportions. Length 13.00-15.00; wing 12.00; tail 4.50-5.50, forked 1.25=1.755 
bill 1.35; depth of bill at base .48; tarsus 1.30. 
General Range.—Nearly cosmopolitan; in North America chiefly along the Atlantic 
and Gulf Coasts of the United States, breeding north to southern New Jersey, and wandering 
casually to Long Island and Massachusetts; in winter both coasts of Mexico and Central 
America and south to Brazil. 
Possible Occurrence in Washington.—B. J. Bretherton in Bulletin No. 68, Oregon 
Agr. Exp. Station, 1902, p. r1o—*A very common fall migrant” (at Yaquina Bay). Dubious, 
but if correct then bird certain to appear along the western coast. 
H. No. 44. 
CASPIAN TERN. 
A. O. U. No. 64. Sterna caspia Pallas. 
Description.—Adult in spring: Top of head and nape uniform lustrous black; upper- 
parts pearl-gray, whitening somewhat on rump and posteriorly; wing-quills not especially 
different, the silvery gray nearly concealing dusky on exposed portions; inner webs plain 
grayish dusky; tail slightly forked for about one-fifth of its length—folded wings con- 
siderably exceeding ; remaining plumage white; bill very stout—the depth at base being 
nearly equ 1 , slightly tinged with dusky 
at tip; feet and legs black. Adult after the breeding season and in winter: Similar, but 
black of crown speckled or streaked with dull white. Young: Black cap of adult represented 
by spotting on top of head (on grayish white ground), increasing in density until nearly 
uniform on hind head; above dull pearl gray. ‘sparingly spotted or. barred with brownish 
dusky; primaries darker than in adult; tail pearl-gray with dusky subterminal spots, or 
indistinet barring; remaining plumage white, bill orange-red; feet brownish black. Length 
20.00-23.00; wing 16.25; tail 5.c0-6.50; bill 2.75; depth of bill at base .80-.95; tarsus 1.80. 
General Range.— Node cosmopolitan; in America of irregular distribution, breeding 
north to Great Slave Lake, south to Lake Michigan, Virginia, Texas, Nevada, California and 
Oregon. 
Supposed Occurrence in Washington.—Messrs. Bohlman and Finley have found large 
colonies of this species breeding on the lakes of southern Oregon and their former appear- 
ance upon the lakes of the East-side is highly probable. Cooper also doubtfully recorded 
the occurrence of certain large Terns seen at Shoalwater Bay under the title Sterna regia 
(Royal Tern) but they were probably of this species. 
