1909] The 1907 Alexander Alaska Expedition. 241 
skins were procured (Nos. 280, 441-447). On July 7, Littlejohn 
found a nest containing four fresh egos. ‘‘The nest was situ- 
ated in a crotch formed by a small limb and the naked body of a 
ten-inch hemlock and was six and one-half feet above the ground. 
It was found by seeing the female fly from it, and was seem- 
ingly but a stray bunch of moss in which a cavity had been made 
by the bird.’’ The eggs are plain nile blue in color, ovate in 
shape, and measure: 24 < 16, 24 « 15.6, 24 & 16.3, 22.7 x 16. 
Planesticus migratorius caurinus, new subspecies. 
Northwest Robin. 
Types.—Male adult; No. 140, U. C. M. V. Z.; Windfall Har- 
bor, Admiralty Island, Alaska; April 27, 1907; collected by C. 
Littlejohn. Female juvenal; No. 160, U. C. M. V. Z.; Port Fred- 
erick, Chichagof Island, Alaska; July 27, 1907; collected by 
Frank Stephens. 
CHARACTERS.—Full-plumaged male resembles Planesticus mi- 
gratorius migratorius of corresponding plumage in the matter of 
size and darkness of coloration, the latter being excessive, but’ 
lacks the extended white patch on inner web of outer tail feath- 
ers; resembles Planesticus migratorius propinquus in the ex- 
tremely narrow white tippings of the outer tail feathers, but 
coloration much darker and size smaller. In other words, this 
new form shares some characters of both, but presents in addi- 
tion an extreme darkness of coloration seldom or never found in 
even migratorius. Young very much darker than in either 
migratorius or propinquus. 
DESCRIPTION OF TypE.—Adult male (No. 140): head ~all 
around black, interrupted by slaty tippings to the feathers pos- 
teriorly, so that there is dorsally and laterally a mergence into 
the color of the back. Eyelids white, except on loral side. Whole 
dorsal surface uniform dark mouse-gray with a tinge of sepia. 
Wings and tail blackish, edged with color of back. Outer pair 
of tail feathers with a terminal bar of white, mostly on inner 
web, at most 3 mm. wide. Proximal to this is an indistinct 
grayish interval merging into the blackish of the basal portion 
of the feathers in question. Extreme chin pure white. Throat 
