509 



PHYLLOSCOPUS BOKEALIS. 



(EVERSMANN'S WARBLER.) 



Sylvia (Phyllopneuste) eversmanni, Midd. Sib. Reise, p. 178 (1851, nee Bp.). 



Phyllopneuste borealis, Bias. Naumannia, 1858, p. 313. 



Phylloscopus sylvicultrix, Swinhoe, Ibis, 1860, p. 53. 



Sylvia flavescens, G. R. Gray, P. Z. S. 1860, p. 349. 



Phylloscopus hylebata, Swinh. J. As. Soc. Beng. xxiv. p. 265 (1861). 



Phyllopneuste borealis, Bias. Ibis, 1862, p. 68. 



Phyllopneuste kennicottii, Baird, Trans. Cliic. Ac. Sc. i. p. 279 (1869). 



Phyllopneuste eversmanni, Homeyer, Journ. fur Orn. 1872, p. 204 (nee Bp.). 



Phyllopseustes borealis (Bias.), Meves, J. f. Orn. 1875, p. 429. 



Figurce notabiles. 



Midd. Sib. Reise, taf. xvi. figs. 1, 2, & 3a; Baird, Trans. Chic. Ac. Sc. i. pi. xxx. fig. 2 ; Meves, 

 Ofv. K. Vet. Ak. Forh. 1871, taf. xv. fig. 2. 



Ad. pileo et corpore supra griseo-fuscis pallide viridi lavatis, uropygio flavo-viridi : cauda, et alis griseo-fuscis, 

 plumis extus viridi-flavido margiiiatis : stria supcrciliari usque ad nucham producta, flavida : alis fasciis 

 duabus transfasciatis : corpore subtus griseo-albo, pectore et hypochondriis griseo et fiavido lavatis : 

 subalaribus, axillaribus et tibiis pallide flavis : rostro fusco, mandibula pallidiore : pedibus pallide 

 fuscis : iride fusca.. 



Adult Male (Lake Baikal, 5th June). Upper parts greyish brown washed with pale green, the rump 

 yellowish green ; wings and tail greyish brown, the feathers externally margined with yellowish green ; 

 a broad yellowish superciliary line passes to the nape ; underparts greyish white, the breast and flanks 

 washed with yellowish and grey ; axillaries, under wing-coverts, and thighs pale yellow ; wings crossed 

 by two bars, the lower one very distinct, the upper one much less so; bill dark brown, the under 

 mandible pale; legs brown; iris dark brown. Total length about -±'75 inches, culmen - 5, wing 27, 

 tail 2 - 0, tarsus 0'8; third and fourth primaries longest, the fifth much shorter, and the sixth con- 

 siderably shorter than the fifth, second intermediate between the fifth and sixth ; bastard primary very 

 small, the exposed part measuring about 0'32. 



Adult in autumn. Resembles the adult in spring, but has the underparts pale yellow, the breast and flanks 

 washed with grey. 



The range of this species appears certainly to be the most extensive of any of the Phylloscopi ; 

 for it has been met with from the north of Norway right across the continent of Asia to Alaska, 

 and in winter it ranges far south amongst the islands of the Indian archipelago. 



It was not known to occur west of Russia until 1876, when Mr. Collett met with it on 

 the Porsanger fiord ; and in an excellent article on this species by that gentleman, he writes 



