Distribution of Birds in North Russia. 185 



Explanation of the Sijmhoh and Arrangement in the follmoing Tables. 



Insufficient data, or unrecorded, or ascertained absence, a space left 

 blank. Present, | . Rare, •!•. Common, ||. Very common, ft- 

 Very abundant, %%. Once, twice, or thrice seen, and added to the 

 fauna -wdthout doubt, i^, |^, ^. Generally distributed, o. Locally 

 distributed, ©. Sporadical, accidental, *. Resident, r. Summer visi- 

 tant, s. Migrant, passing northwards in spring, /\ . ^ligrant, passing 

 southwards in autumn, \j . Winter, w. 



Species which are of extremely doubtful occurrence in any part of the 

 North of Russia (which can scarcely be admitted at aU to the faima) 

 have their names enclosed in brackets and are not numbered (example, 

 Falco sacer, in Table). Those species which were thus enclosed in 

 , the last part of this paper as of extremely doubtful occurrence in the 

 Northern Division, but which can distinctly be admitted to the fauna 

 of the Southern Division have the brackets remoDed, and become entitled 

 to a number preceding them (\ade Totanus stagnatilis, in Table). As in 

 Part II. the nmnber of the authority who gives a doubtful record (for 

 the Southern Division) is also enclosed in brackets, thus (20). 



In the " Reference to Authorities " column, I have also thought it ad- 

 visable to use square brackets upon occasions, especially round Sabaniieli's 

 No. 22, thus [22]. This indicates the probable or possible occurrence of 

 certain species witliin the limits of the Southern Division, according 

 to authors' showing, which species are known to occur close to our 

 southern boundary, or which are known to have occm-red north of om- 

 northern boundary. As this cannot, however, admit them to positive 

 record, I do not give them place in the district columns. In other words, 

 the square brackets simply indicate such species as may stiU be expected 

 to occur in the Southern Division. 



In the column for the consecutive numbers which precede the names of 

 the species : — 



Roman (or ordinary tliin) type distinguishes such species as are common 

 to the two DmsiONS ; and with these are included such as have certainly 

 occurred in one or other Division (bid in which is still uncertain^). 



Clarendon (or thick) type is used to distinguish the species which occur 

 in the Northern Division, but not in the Southern. 



Old-cut type {e.g. 3) ia.used to distinguish those which occur in the 

 Southern Division, but not in the Northern, Doubtful records are 

 not taken notice f)f in these distinctions. 



And, as already explained, such species as are totally rejected have no 

 number printed before them. 



' For a list of these, vide Summaries, infra, page 201 . 

 Ann. & Mag. N. Hist. Scr. 4. Vol. xx. KJ 



