BIRDS OF NORTH AND MIDDLE AMERICA. 



697 



Length (skins), 100-115 (llO); wing, 60-65 (62); tail, 43.5-47.5 (44.9); 

 exposed culmen, 9-9.5 (9.2); tarsus, 18-19 (18.7); middle toe, 9-11 

 (10.2)." 



Western Alaska (St. Michael, Nushagak, Alloknagik Eiver, Kowak 

 River, etc.); migrating in winter to Southeastern Asia, but by what 

 route and to what countries not yet determined.* 



Phyllopnmste kennicotti Baikd, Trans. Chicago Acad. Sci., i, 1869, 313, pi. 30, 

 fig. 2 (St. Michael, Alaska; coll. U. S. Nat. Mus.). 



Phlyllopseustes'] borealis kennicotti Stejnegeb, Bull. U. S. Nat. Mus., no. 29, 1885, 

 303, in text. 



IPhyllopnemte] borealis (not of Blasius) Coues, Key N. Am. Birds, 1872, 77. 



Phyllopneuste borealis Ooubs, Check List, 1873, no. 20. — Baikd, Bkeweh, and 

 KiDGWAY, Hist. N. Am. Birds, i, 1874, 70, pi. 5, fig. 5. 



Phylloscopus borealis Eidgway, Proc. U. S. Nat. Mus., 1880, 215; Norn. N. Am. 

 Birds, 1881, no. 34.— Seeeohm, Cat. Birds Brit. Mus., v, 1881, 40, part (in 

 synonymy). — Coues, Check List, 2ded., 1882, no. 32. — Nelson, Cruise "Cor- 

 win" in 1881 (1883), 60 (St. Michael, Alaska). 



P[/ij/Hoscqptts] borealis Coues, Key N. Am. Birds, 2d ed., 1884, 259, part. 



Phyllopsemtes borealis Stejnegee, Bull. U. S. Nat. Mus., no. 29, 1885, 302, part 

 (Alaskan references, etc.). — American Oenithologists' Union, Check List, 

 1886, no. 747, part.— Townsend (C. H.), Auk, iv, 1887, 13 (Kowak E., 

 Alaska). — Gbinnell, Pacific Coast Avifauna, i, 1900, 60 (Kowak R. ; habits). — 

 McGrbgok, Condor, iv, 1902, 144 (Signal Cairn, Norton Sound; habits). 



Plhyllopseustes'] borealis Bidgway, Man. N. Am. Birds, 1887, 567, part. — Coues, 

 Key N. Am. Birds, 5th ed., i, 1903, 261, part. 



(7) Phylloscopus trochilus (not Motadlla trochilus LinnsBus?) Plbske, Ornitho- 

 graphia Rossica, ii, pt. 2, 1889, 229 (Bering Sea). <■ 



« Seven specimens, none of them with sex determined. 



These Alaskan specimens, compared with series of both sexes from eastern Asia, 

 compare in average measurements as follows: 



All the Asiatic males measured are from the Commander Islands and Petropaulovsk, 

 Kamchatka; the females are from China, Burma, Siam, Philippines, etc., and possi- 

 bly include some specimens belonging to the Alaskan form, taken as migrants. The 

 smallest Asiatic specimens are from Chance Island, Siam (wing 60, tail 43) , and Kow- 

 loon, China (wing 63.5, tail 45). 



&The range of A. b. borealis is as follows: 



Breeding in arctic districts of the Palsearctic Region, from Finmark to Kamchatka 

 (including Commander Islands), and in subalpine districta of southeastern Siberia 

 and Mongolia; migrating southward through China (coastwise), Japan, and Formosa 

 to the Philippines, Malay Archipelago, Malacca, Tenasserim, and South Andaman 

 Islands; accidental in Heligoland. 



« Specimen in the St. Petersburg Academy museum (no. 10861) collected by Wos- 

 nessensky in Bering Sea August 24, 1843. 



