PARUS CAMTSCHATKENSIS. 
(SIBERIAN MARSH-TITMOUSE.) 
Pecila kamtschatkensis, Bp. Consp. Gen. Ay. i. p. 230 (1850). 
Parus borealis, Middend. Reise in d. N. u. O. Sibiriens, ii. p. 155 (1851, nec Selys). 
Parus palustris, var. borealis, Schrenck, Reis. im Amurlande, i. p. 307 (1860, nec Selys). 
Pecile baicalensis, Swinhoe, Ann. & Mag. Nat. Hist. vii. p. 257 (1871). 
Figura nulla. 
Ad. P. boreali similis, sed nigro pilei usque ad dorsum extenso, dorso pallidiore et grisescentiore, capitis et 
dorsi lateribus circa pileum niveis, remigibus secundariis griseo-albo marginatis, cauda longiore. 
Adult (Ust Zylma). Differs from Parus borealis in having the black cap very much more developed, 
extending down to the centre of the back; the back is paler and greyer; the sides of the head below 
the cap, and a broad band bordering the cap right down to the end, pure white; secondaries broadly 
margined with greyish white; tail as in Parus borealis, but rather longer. Total length about 5°25 
inches, culmen 0°43, wing 2°52, tail 2°6, tarsus 0°68. 
WHEN writing the article on Parus borealis, together with Mr. R. B. Sharpe, in August 1872, we 
were unable to decide as to the specific distinctness of the present bird, as we possessed but a 
single specimen from Lake Baikal; but since then I have had an opportunity of examining a 
larger number of specimens, and have convinced myself beyond doubt that the eastern bird 
constitutes a fairly distinct species, differing quite as much and as constantly from Parus borealis 
as that species does from Parus palustris. Furthermore, thanks to the researches made by 
Messrs. Seebohm and Harvie-Brown in North-east Russia, I have ascertained that the Siberian 
Marsh-Tit is certainly a resident species within the Western Palearctic Region. Its range 
extends from the Petchora river eastward throughout Siberia to Kamtschatka. Messrs. Seebohm 
and Harvie-Brown met with it at Ust Zylma on their arrival there in April, when it was still 
full winter, and I am indebted to the latter of these gentlemen for the following notes :— 
“ During our stay at Archangel in March and beginning of April we shot two or three 
specimens of the Northern Marsh-Tit (Parus borealis, De Selys). They were frequenting the 
spruce firs on an island near Archangel at the time they were shot; and south of Archangel we 
found this Marsh-Tit not uncommon at the edges of the pine-woods as we travelled by sledge 
from Vologda. Of the distribution of Parus borealis to the eastward we cannot speak with any 
certainty, as we do not find any records in our journals of the occurrence of any species of 
Titmouse during our rapid sledge-journey between Archangel and Ust Zylma. 
“We met with the Siberian Marsh-Titmouse, however, in small numbers, amongst the alder- 
and birch-woods near Ust Zylma, and at Habariki, in April and the beginning of May, but did 
not see them after the snow disappeared, or meet with them again to the northward of the last- 
named locality. 
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