1SS4.] Allen on Zoo logical Nomenclalure. 34 S 



extreme form so far as whiteness of the forehead and under parts 

 is concerned. 



'•'•Sitta i(ralc)isls-si)icnsis may be applied to the series of 

 forms found in the valley of the Amoor, the island of Askold, and 

 the main island of Japan. They are intermediate in color 

 between the Central Siberian and Cliinese forms, and are scarce- 

 ly to be distinguished from the l^altic j^rovince forms. 



'"''Sitta shicnsis is found in China, and only diflers from the 

 British form in being slightly smaller and in not having quite so 

 much dark chestnut on the flanks. 



"•I have purposelv chosen a complicated case in order to show 

 the capabilities of the system, which, if the specific name of 

 europc^a is always i"epeated after the generic name of Sitta^ 

 becomes a compromise between that adopted by the Americans 

 and that which I imperfectly carried out in the fifth volume of 

 the 'Catalogue of Birds in the British Museum,' and which was 

 originally suggested to me by a conversation with Mr, Salvin. 

 It has at least the merit of being exhaustive, and differs so slight- 

 ly from that in common use in America that its adoption does not 

 involve a change in, but only an addition to, the S}stem which in 

 some form or other is destined to supercede the binominal system 

 now i-endered inadequate by the acceptance of the theory of 

 evolution. 



"As an example of the compromise I propose, I add a list of 

 the local races of the Dipper, with their geographical ranges : — 



" Cinclus aquaticus 7nelanogaster (Scandinavia). 



'■'• Cinclus aqjiatictis 7nelauogaster-albicollis sive Ciuchts 

 aquaticus (West-Europe, as far north as the Carpathian and as 

 far south as the Pyranees). 



'•'•Cinclus aquaticus albicolUs (South Spain, Algiers, Italy, 

 Greece) . 



'' Cificlus aquaticus albicollis-cashmiriensis (Asia Minor, 

 Caucasus, Persia). 



'•'• Cinchis aquaticus leucogaster (East Siberia). 



'•'• Cijiclus aquaticus leucogaster-cashinirieusis (Central Si- 

 beria) . 



" Cinclus aquaticus cash?niriensis (Cashmere, South Siberia, 

 and Mongolia). 



" Cinclus aquaticus caskmiriefisis-sordidus (Altai jMoun- 

 tains) . 



