848 
U. S. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
LAEUS SUCKLEYI, Lawrence. 
Suckley’s Gull. 
Larus suckleyi, Lawr. Ann. Lyc. N. H. N. Y. VI, 1858, 264. 
Sp. Ch. — Adult. Head, neck, under plumage and tail, pure white ; back and wings clear pearl blue ; ends of the primaries 
black, occupying about half the length of the first and decreasing to the seventh, on which it consists only of a sub-terminal 
spot ; the first primary has a white spot over both webs an inch and a half in extent inside the tip, the second has a similar 
mark of white, but less in extent ; the tips of the first and second primaries are black, but of all the others white ; the 
secondaries and tertiaries largely marked with white at their ends ; bill dusky yellowish green, except on the ridge of the upper 
mandible, forward of the nostrils, and on the angle of the lower mandible, which parts are orange yellow ; tips of both 
mandibles pale yellow ; legs and feet greenish yellow. 
Length, 17j inches ; alar extent, 43| ; wing, 13J ; tail, 5J ; bill, 1 5-16 ; tarsi, 1|. 
Young. Mottled with grayish white and dark ash ; wings and tail dark brown, the latter ashy white at the base and tip ; bill 
flesh color for half its length from the base, terminating with black ; legs and feet flesh color. 
Hab .—Pacific coast ; Puget’s Sound. 
Four specimens are in tlie collection. 
List of specimens. 
Catal. 
No. 
Age. 
Locality. 
When col¬ 
lected. 
Whence obtained. 
Orig’l 
No. 
Collected by— 
Length. 
Stretch 
of wings. 
Wing. 
Remarks. 
4571 
Feb. 4,]856 
217 
Dr. Suckley.... 
17.50 
43.25 
13.75 
8435 
17.00 
14.00 
6472 
o 
8 
17.25 
44.50 
13.25 
6476 
O 
Oct. 13, 1854 
105 
16.00 
41.50 
12.75 
black tips; feet flesh color. 
BLASIPUS, Bonaparte. 
Blasipus, Bon. 1852. 
Ch .—Bill long and rather slender ; general color dusky ; of medium size. 
Bonaparte enumerates three species under this genus, only one of which inhabits our coast; 
in my opinion he has improperly placed “belcheri” and “fuliginosus ” (closely allied species, 
if not identical with the above,) in a different genus, viz : Leucophaeus , the type of which is 
“ haematorhynchus,” a species having the hill very robust. 
BLASIPUS HEEKMANNI, Bon. 
The White-headed Gull. 
Larus heermanni, Cass. Proc. Acad. N. Soc. Phil. VI, 1852, 187. —Ib. Ills. I, 1853, 28 ; pi. v. 
Adelarus heermanni, Bruch, Cab. Jour. 1855, 279. 
Blasipus heermanni, Bon. Cons. Av. II, 1856, 211. 
Sp. Ch. — Adult. “ Bill red, both mandibles tipped with black ; feet and legs dark ; head white, which color gradually blends 
into an ashy lead color, enveloping the entire body above and below, darker on the back and wings and paler on the abdomen. 
Secondary quills tipped with white, forming an oblique bar when the wings are folded. Superior coverts of the tail very pale 
cinereous, nearly white. Quills and tail feathers brownish black, all of the latter narrowly tipped with white. Shafts of the 
two first primaries white on the inferior surface of the wing.” 
“ Total length, about 17| inches; wing, 13| ; tail, 5| ; bill from angle to tip of upper mandible, 2^ inches.” 
“ Young. Smaller ; total length, about 16 inches ; wing, 13 ; tail, 5 inches. Entire plumage brown, darker on the head and 
paler on the under surface of the body ; quills and tail feathers brownish black, the latter narrowly tipped with white.” 
Hab. —Coast of California. 
