Plate 11. 



(HALF NATURAL SIZE.) 



1, Chiffchaff (Phyttoscopus e. collybita) winter. 2, Siberian Chiffchaff (Ph. c. tristis) winter. 

 3, Adult summer, 4, First winter of Willow- Warbler (Ph. t. trochilus). 5, Northern Willow- 

 Warbler (Ph. t. eversmanni) adult summer. 6, Greenish Warbler (Ph. n. viridanus}. 

 7, Wood- Warbler (Ph. s. silrilatrix) juvenile. 8, Eversmann's Warbler (Ph. b. borealis) first 

 winter. 9, Yellow-browed Warbler (Ph. k. premium) winter. 



[Face p. 312.] 



