58 University of California Publications m Zoology [Vol.30 



Hazelton and Telegraph Creek. At Atlin, hairy woodpeckers were all 

 but absent, but the specimens secured were the northern D. v. Imico- 

 melas. Dryobates pubescens leucwnis 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 rufius is abundant at Hazelton, less com- 

 mon at Telegraph Creek, and decidedly rare at Atlin. Carpodacus 

 purpureus pu-rpur&ii^, abundant at Hazelton, was rare at Telegraph 

 Creek, and seen once at Atlin. Vireosylva gilva swainsom, abundant 

 at Hazelton and Telegraph Creek, was represented by one pair seen 

 at Atlin. Oporonis tolmiei, 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 abbr&viatus, found in 

 small numbers near Hazelton and Telegraph Creek, was seen once at 

 Atlin. Cypselddes niger borealis, Chaeiwra voMxi, Melospiza melodia 

 morphna, and Piranga ludoviciarun, are species that apparently all 

 find their northern limit near Telegraph Creek, none being seen at 

 Atlin. 



The non-occurrence of any form of Passerellm 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. i. iliaca and P. i. altiwagans, and thus that these 

 forms may not really be so closely related as I had supposed (Swarth, 

 1920, p. 93), a belief founded Jar gely upon the appearance of certain 

 winter birds of intermediate character. Altivagans apparently occurs 

 throughout a wide range of territory between the habitat of P. i. 

 schistacea, of the Eoeky 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. i. 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. 



