2 A. A. Allen on Zoological JVotttenclafure^ [October 



Sitta ccesia^ 



Sitta ccBsia-uralensis^ 



Sitta uralensis^ 



Sitta uralensis-sinensis^ 



Sitta sinensis. 



" So far so good ; but, unfortunately, two more complications 

 arise. Besides the series running southwest into S. ccesia., and 

 that running southeast into S. sinensis., two other series run from 

 the central form S. uralensis., one running due west and then 

 round by the Baltic into the Scandinavian S. em-opcsa (a larger 

 bird, and somewhat darker on the under parts), and a second run- 

 ning due east and then round the Sea of Okotsk into the Kam- 

 chatkan S. albifrons (a bird much paler on the head, which 

 shades into white on the forehead) , so that it is necessary to 

 add four more names to the list, which will stand as under : — 



'"'•Sitta ccesia is found in Britain, South-West and South Europe, 

 and Asia Minor. It is medium in size, but extreme in the dark- 

 ness of the chestnut of the vmder parts. 



'•''Sitta ccesia-iiralensis (with a hyphen between the two spe- 

 cific names) represents all the forms intermediate between South 

 European and Siberian examples, which occur in Denmark, 

 Pomerania, the Baltic provinces of Russia, Poland, and the 

 Crimea. 



'•'•Sitta eui'opcea is the Scandinavian form, and represents the 

 extreme of size, whilst in color it is intermediate between the 

 forms found in the Baltic provinces of Russia and Central 

 Siberia. 



'•'•Sitta etwopcea-tiralensis comprises all the intermediate forms 

 in Russia which connect the Scandinavian with the Central Sibe- 

 rian forms. 



'•'•Sitta uralensis is found in the valleys of the Ob, the 

 Yenesei, and Lena, and combines the small size characteristic of 

 the various Asiatic subspecies of Nuthatch with the dark upper 

 parts of the sub-tropical forms, whilst the under parts are 

 nearly as white as in the Kamchatkan form. 



'•'• Sitta uralensis-alb if rons may be applied to all those inter- 

 mediate forms found in East Siberia and the north islands of 

 Japan which are not quite so pale on the upper parts as the 

 Kamchatkan form. 



'' Sitta albifrons \s iound in Kamchatka, and represents the 



