SYLVIIN/E. 11 



over the whole Japanese group; and secondly, that the effect of the 

 changed climatic and other conditions was the same on each species, 

 reducing the size, lengthening the tail, and altering the colour from 

 russet to olive. 



46. CETTIA DIPHONE. 

 (BONIN BUSH-WARBLER.) 



Sylvia diphone, Kittlitz, Mem. priSs. a I'Acad. Imp. des Sciences St. Petersb. 

 par divers savans, 1830, p. 237. 



The Bonin Bush-Warbler resembles the Small Japanese Bush- 

 AVarbler in colour ; but it differs from it in liaving a longer tail (2*56 

 to 2"46 instead of 2'3 to 2"1), a longer tarsus ("98 to "93 instead of 

 •9 to '89) J and a longer bill ("7 to "69 instead of '6 to '5 inches). 



Figures : Kittlitz, Mem. pres. a l^Acad. Imp. des Sci. St. Petersb. 

 par divers savans, 1830, j)l. 14. 



Tiie Bonin Bush- Warbler was discovered by Kittlitz in 1828, and 

 remained almost unknown until it was rediscovered in 1889 by Mr. 

 Hoist (Seebohm, Ibis, 1890, p. 99). A mutilated example was pro- 

 cured by Mr. N. Ota in February 1883 (Blakiston, Amended List of 

 the Birds of Japan, p. 56, no. 234^), and there is an example in the 

 Pryer collection probably from the same source. 



I have three examples from Peel Island, and two from one of the 

 Parry Islands, collected by Mr. Hoist. 



47. CISTICOLA CISTICOLA. 

 (FAN-TAILED WARBLER.) 



Sylvia cisticola, Temminck, Man. d'Orn. i. p. 228 (1820). 



The Fan-tailed Warbler has a large first primary, conspicuous 

 streaks on the back, and pale tips to the tail-feathers. 



Figures : Temminck and Schlegel, Fauna Japonica, Aves, pi. 20 c 

 (summer plumage of Japanese race) ; Dresser, Birds of Europe, iii. 

 pi. 99 (winter plumage of typical race). 



The Fan-tailed Warbler is a resident in Southern Japan, but is not 

 known to have occurred in Yezzo. There are a dozen examples in 



