374 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Type.—Adult male, no. 40336, M.C.Z. Buchanan Bay, Ellesmere 
Land, collected June 10, 1901, by J. S. Warmbath. 
Characters.—- About the size of L. kumlient Brewster, but differing 
in color of mantle, primaries, and having a larger and more heavy bill. 
The color of the mantle is intermediate between kumlieni and 
argentatus, darker than the former, lighter than the latter. 
The first primary is broadly tipped with white, the outer web black- 
ish slate (Ridgway’s Nomenclature of color), on the inner web this 
color extends rather less than one half across the web; second primary 
similar only with subterminal black band and blackish slate on inner 
web more narrow, on the outer web it does not extend as near the base 
of the feather as on the first; third primary with white tip, blackish 
slate on outer web less extensive, on inner web the black is limited to a 
subterminal patch about 35 mm. long extending across web; fourth 
primary with white tip, blackish slate on outer web extending about 
45 mm., on inner web about 20 mm., fifth primary with white tip, 
then subterminal blackish slate band, then narrow poorly defined bar 
of white. 
Measurements.— Type, adult male: wing, 406; tail 167; tarsus 65; 
bill 57. 
Description of immature male taken by Joseph Dixon at Griffin 
Point, Arctic Alaska, June 25, 1914. Orig. no. 3752. 
First primary fuscous hair-brown on outer web, lighter on inner web 
changing to a neutral gray, with narrow whitish tip; second primary 
similar but slightly darker on inner web, especially near tip where it 
is as dark as outer web, and extends to outer edge; third primary 
the same; fourth primary similar except that outer web has narrow 
lighter edge, and inner web for the most part neutral gray; fifth 
primary similar but no brown on inner web except a patch near the 
tip which extends across the web. 
The tail feathers are white with subterminal patches of fuscous hair- 
brown varying in size, being smaller on the outer feathers. 
The inner secondaries have light brown areas on outer webs about 
30 mm. long, with pallid neutral gray edges. 
Mr. Warmbath found this species breeding at Buchanan Bay, 
several sets of eggs being in Mr. Thayer’s collection. 
Besides the type there are three females in the M. C. Z. collection 
taken by Mr. Warmbath at the same locality, and Mr. Thayer's 
collection contains a small series. 
Mr. Dixon took an adult female at Demarcation Point, Alaska, 
August 28, 1913. 
