1910] 
Grinnell—Birds: Alaska Expedition, 1908. 
415 
Measurement of 10 adult males of P. r. rufescens from Sitkan 
district (Baranof and Admiralty islands) : 
Bill from 
No. Locality Collector Date Wing Tail Culmen Nostril 
1197* Baranof Id. J. Grinnell June 29,1896 62.4 55.5 85 6.7 
1217* Baranof Id. J. Grinnell July 1,1896 61.6 549 85 7.0 
1479* Baranof Id. J. Grinnell Aug. 17,1896 61.1 55.0 81 69 
1160* Baranof Id. J. Grinnell June 23,1896 60.7 543 89 7.2 
1177* SBaranof Id. J. Grinnell June 24,1896 60.7 54.6 84 7.3 
1110* Baranof Id. J. Grinnell June 10,1896 59.9 535 84 68 
1155* Baranof Id. J. Grinnell June 22,1896 59.3 540 83 7.2 
815 Baranof Id. F. Stephens June 16,1907 60.3 52.6 85 7.3 
349 Admiralty Id. F. Stephens May 6,1907 63.9 55.8 7.8 7.0 
3848 AdmiraltyJd. F. Stephens May 3,1907 61.6 553 80 68 
AC era eu Oth ew 0 prtiel cee meee ee eee arenes 6l-- 545-- 8.3-— 7.0-- 
* Grinnell coll. 
The Sitkan examples are identical in size as well as in color, 
as far as I can see, with a series of chestnut-sided chickadees 
from Washington, Oregon, and northern California. From all 
these the Prince William Sound form differs not only in larger 
bill, but also in the gonys, which is more nearly straight, and 
Fig. 8.—Penthestes rufescens vivax, type, adult male; lateral outlines of 
jo << 26 
Fig. 9.—Penthestes rufescens rufescens, adult male, no. 349, Admiralty 
Island, Sitkan district, Alaska; lateral outlines of bill; x 2. 
in the culmen, which is more curved. The bill thus presents a 
different lateral outline. (See figs. 8 and 9.) The generally 
larger size is shown in the tables of measurements given above. 
Besides the above listed localities where specimens were taken, 
the species was also observed on Hoodoo, Chenega, Disc, Eleanor, 
Naked, and Storey islands. The collectors record it from each 
very abundant.”’ 
GG 
of the numerous loealities as ‘‘several seen’’ to 
Nos. 1367, 1370, and 1371 are full-grown juvenals, from Green 
Island (July 14), Port Nell Juan (August 16), and Drier Bay, 
