58 University of California Publications in Zoology [Vou 30

Hazelton and Telegraph Creek. At Atlin, hairy woodpeckers were all
but absent, but the specimens secured were the northern D. v. leuco-
melas. Dryobates pubescens leucurus is common at Hazelton, we
found no downy woodpecker at Telegraph Creek, and at Atlin the one
specimen of this species that was taken proved to be the northern
D. p. nelsoni. Selasphorus rufus is abundant at Hazelton, less com-
mon at Telegraph Creek, and decidedly rare at Atlin. Carpodacus
purpureus purpureus, abundant at Hazelton, was rare at Telegraph
Creek, and seen once at Atlin. Vireosylva gilva swainsoni, abundant
at Hazelton and Telegraph Creek, was represented by one pair seen
at Atlin. Oporonis tolmiet, abundant at Hazelton and Telegraph
Creek, was doubtfully identified once at Atlin (June 24, 1924; not
included in the following list). Setophaga ruticilla, abundant at
Hazelton and but little less numerous at Telegraph Creek, was
decidedly rare at Atlin. Penthestes gambeli abbreviatus, found in
small numbers near Hazelton and Telegraph Creek, was seen once at
Atlin. Cypseloides niger borealis, Chaetwra vauzi, Melospiza melodia
morphna, and Piranga ludoviciana, are species that apparently all
find their northern limit near Telegraph Creek, none being seen at
Atlin.

The non-occurrence of any form of Passerella in the Atlin region
is of interest. P. iliaca altivagans was found breeding in the vicinity
of Hazelton but nowhere near Telegraph Creek. Its absence in the
Atlin region, too, suggests that there is a wide gap between the breed-
ing ranges of P. ¢. iliaca and P. i. altivagans, and thus that these
forms may not really be so closely related as I had supposed (Swarth,
1920, p. 93), a belief founded largely upon the appearance of certain
winter birds of intermediate character. Altivagans apparently occurs
throughout a wide range of territory between the habitat of P. 7.
schistacea, of the Rocky Mountain and Great Basin regions, and of
P. i. fuliginosa, of the coast, but it does not seem to range northward
as far as the summer home of P. ¢. iliaca.

Faunally, Atlin may be considered as the extreme southern limit
of the Yukon region. As regards birds there are many southern
species that find their northern limit a short distance to the southward,
and certain characteristic northern species that extend barely this far
south. The Atlin avifauna is of the interior, purely. There is not a
single distinctively coastal species that penetrates this distance inland,
less than one hundred miles away from salt water.