312 A PRACTICAL HANDBOOK OF BRITISH BIRDS. 



PHYLLOSCOPUS BOREALIS 



130. Phylloscopus borealis borealis (Bias.) — EVERSMANN'S 

 WARBLER. 



Phyxlopneuste borealis Blasius, Naiunannia, p. 313 (1858 — Sea of 



Ochotsk.). 



Phylloscopus borealis (Blasius), Clarke, Ann. Scot. Nat. Hist., 1909, p. 1. 



Eversmann's Warbler (Phylloscopus h- borealis). Note longer 2nd and shorter 1st 

 primaries than in Greenish Warbler. 



Description (Plate 11). — Adult male and female. Winter. — 

 Whole upper-parts dark olive-green ; stripe from nostrils, over 

 and behind eye pale creamy -yellow ; streak through lores and 

 behind eye dark olive-green ; ear-coverts pale yellow mottled 

 dark olive ; under-parts yeUowish-white with faint pale yeUow 

 streaks, upper-breast very faintly streaked dusky-olive and sides 

 of breast and flanks washed olive ; axillaries whitish edged and 

 tipped pale yellow ; wing and tail-feathers dark-brown, outer 

 webs edged olive-green and inner webs narrowly whitish ; all 

 wing-coverts dark brown edged and tipped olive-green but the 

 outer half of greater coverts with pale yellow or whitish tips and 

 a few of the median coverts similarly, but not so distinctly, tipped. 

 This plumage is acquired by complete moult in August. Summer. — 

 A complete moult (including wings and tail) takes place Jan. to 

 March. New plumage as winter. Abrasion has little effect except 

 that pale tips of median coverts usually become worn off and 

 sometimes those of greater coverts are almost entirely worn away. 



Nestling. — (Not examined.) 



Juvenile. — Resembling adult but upper-parts considerably 

 less green, being strongly tinged greyish-brown especially on crown 

 and mantle ; under-parts whiter with only a very slight tinge 

 of yellow, sides of breast and flanks washed pale brown ; wing- 

 coverts with brownish-green edges and tips and pale tips of outer 

 greater coverts whiter, pale tips of outer median coverts very small 

 or absent. 



First winter. — Intermediate between adult and juvenile, 

 wings, tail and wing-coverts become browner as autumn advances 

 and pale tips wear off median coverts and often a mere trace is 



