344 CEETHTID^. 



Ohs. 2. The Europcau specimens, i. e. from Scandinavia and 

 Nortliern Eiissia in Europe, have the iinderparts more or less slightly 

 tinged -with crcam-coloiu", the chestnut on the flanks heingvery deep 

 and rich ; whilst eastwards, through Northern Siberia as far as the 

 island of Yesso, the birds get purer white and the chestmit on the 

 flanks less rich. This has been noticed before by several able natiira- 

 lists, such as Pallas, Radde, and Schrenck, and has, later on, given 

 origin to names like S. scptcntrionalis, S. advena, and especially S. 

 uralensis. 



Hah. The Northern Nuthatch inhabits the greater part of the 

 northern Pala>arctic region, extending from Scandinavia through 

 Russia and Siberia to the northern island of Japan. In Europe its 

 southern frontier seems to be the Baltic Sea, as it is not found in 

 England, Western and Central Europe. 



Subsp. a. Sitta nagaensis. 

 Sitta nagaensis, Godio.-Aust. P. Z. S. 1874, p. 44. 



Breast dingy greyish white, entire flanks rich chestnut-red ; under 

 tail-coverts with a large white subterminal spot, edged and tii^ped 

 with chestnut^red (not rusty chestnut with a white subterminal 

 spot, as the original description has it). In every other respect this 

 bird is exactly like S. europcea, var. uralensis. 



a. Ad. S 

 b 



Hal. Hills of N.E. Bengal. 



dad. sk. Munipur (GWiCTw-^wsfew). Gould Collection. 



