Plate 11. 



(HALF NATUKAL SIZE.) 



1, Chiffchaff (Phylloscopus c. collybita) winter. 2, Siberian Chiffchaff (Ph. c. tristis) wintpr. 

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

 Warbler (Ph. t. eversmanni) adult summer. 0, Greenish Warbler (Ph. n. viridatms). 

 7, Wood- Warbler (Ph. s. sibilatrix) juvenile. 8, Eversmann's Warbler (P/i. b. borealis) first 

 winter. 9, Yellow-browed Warbler (Ph. h. prvemium) winter. 



{Face p. 312. J 



