136 University of California Publications in Zoology [Vou. 30

Certain Alaskan skins are paler colored than any eastern birds, and
some have decidedly more extensive white markings (as on the lateral
rectrices) than most eastern skins. An exceptional British Columbian
specimen has the outer rectrices entirely white. There are Alaskan
birds, though, that lie well within the range of variation of eastern
birds, and there are one or two eastern birds with white markings on
the tail feathers nearly as extensive as in any western ones.

There are a number of winter birds in this series from points lying
between the Great Lakes and the Rocky Mountains, and nearly all of
these I am unable to allocate to an eastern or a western race with any
degree of assurance. Thus, while recognizing in the northern shrike
a tendency toward development of the characters ascribed to mvictus
in the western part of its habitat, it seems to me so impossible to define
the boundary between an eastern and a western race, or to identify
most winter birds taken south of the breeding range, that I am
disinclined to use different names for the variations exhibited.

Vireosylva gilva swainsonii (Baird). Western Warbling Vireo

A rare species, here probably at the extreme northern limit of its
range. First seen June 8, and from then on, at this one place, a vireo
could be seen or heard singing at almost any time during the next
few weeks. The indications were that a pair was nesting there-
about. The only other occasion on which the species was seen was on
August 17, when one bird was collected by Brooks.

Vermivora celata celata (Say). Orange-crowned Warbler
Migrating, not uncommonly, about Atlin, during August. Three
specimens were collected (nos. 44901-44903), two females taken
August 13, and one male on August 17, all immatures in first winter
plumage. Others of this subspecies, easily recognized as a rule by the
gray head, were seen until August 31.

Vermivora celata orestera Oberholser
Rocky Mountain Orange-crowned Warbler
An ‘‘orange-crowned warbler,’’ apparently of this subspecies, was
seen at Carcross, May 24. Small numbers were migrating through
the Atlin region during the last week in May and first week in June,
and a few pairs bred in the lowlands thereabout, where they were seen