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becomes abraded and paler, and the alar bands are less clearly defined. The winter dress does not 

 differ from that worn in the autumn. The female does not differ from the male, except that it is 

 somewhat smaller in size. 

 According to Pleske, in the nestling plumage the upper parts are tinged with brown, the band on the rump 

 is indistinct, and the throat and breast are tinged with mouse-grey. 



Pallas's Willow-Warbler appears not only as a straggler, but regulaidy on migration within the 

 Western Palsearctic Region. It is known to occur from the Ural range to Eastern Siberia, 

 breeding in the latter country, and migrates south in the autumn, wintering probably in Southern 

 China and India. It has been obtained as far west as Heligoland, where, Mr. Gatke says 

 (Vogelw. von Helgoland, p. 304), one was killed by Aeuckens in October 1845, and another 

 seen, but not obtained, in October 1875. 



Mr. Pleske writes respecting its range in Russia (Orn. Ross. p. 316) as follows: — "Mr. Zarudny 

 gives the following particulars of its occurrence in the vicinity of Orenburg : ' In the autumn of 

 1887 I again obtained this species (I obtained one in each of the years 1879 and 1884) near 

 Orenburg, under circumstances that would lead me to surmise that a migration had taken 

 place. On the 3rd October a pair were observed in the Protopopen grove, and on the 4th 

 October a flock of about 15 individuals, with which were several Goldcrests ; one was also 

 observed in a flock of Parus ater. To judge from the characteristic call-note, this bird was 

 observed earlier, between the 28th September and 4th October, in the woods on the other side 

 of the Ural. In 1888 it again appeared near Orenburg, though in smaller numbers. On the 

 3rd October one was obtained in the woods on the other side of the Ural, and on the 23rd 

 October again one out of a flock of five at the village of Neshenka.' 



" One of the above-cited specimens in full autumn plumage was sent to me by Mr. Zarudny, 

 and is the specimen above described. In West Siberia this Warbler has not been observed ; but 

 is, according to Taczanowski, not uncommon throughout East Siberia. The most westerly 

 records, from the Wercholenskischen district, on the Upper and Central Eena, and on the 

 Witim, are those of Poljakoff, and later of Sperk ; but these do not carry much weight, as they 

 may refer, to some extent or entirely, to P. superciliosus. 



"The references to its occurrence near Lake Baikal are tolerably numerous. Schwedoff 

 observed it on passage in the public gardens at Irkutsk and on the banks of the Uschakovka, 

 about 40 versts from that town, and his identifications have been verified by Dr. Severtzoff. 

 According to Dybowski it is not rare at Kultuk, but does not appear to breed there, as nests 

 were only found at Petrovsk, beyond Lake Baikal, on the left bank of the Sselenga ; a specimen 

 obtained by him is in the British Museum. Mr. Mollesson records this Warbler on passage 

 from near the town of Troitzkossavsk, opposite Kjachta, late in August 1885, and Pallas's 

 original specimen came from the Ingoda River in Transbaikal. Dr. Dybowski records it from 

 the mineral springs of Darasun ; and Dr. Radde observed it on the Tarei-nor near the frontier 

 station Kulussutajefskoje, but confused it with P. super ciliosus. Not far from here is the 

 frontier station Tsuruchaitui, where Dr. Dybowski met with it. We must also refer to the 

 records of von Middendorff from the Stanowoi Mountains and from the Ussuri country. As, 

 however, von Middendorff did not separate these two Siberian Willow- Warblers, I must refer 



