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Phylloscopus sibilatrix in having a comparatively shorter tail. We only met with this one 

 specimen of Phjlloscopus borealis, and are consequently unable to give any further information 

 respecting it." I may also remark that it has certainly occurred once in Heligoland; for 

 Mr. Gatke obtained it there in October 1854; and he believes that he saw another on the 1st 

 June 1859. 



In Asia it is very widely distributed. Mr. Seebohm found it breeding on the Yennesei, but 

 did not meet with it further north than 69° N. lat., — though Von Middendorff obtained it on the 

 Boganida in 70° N. lat. late in June ; and he also says that he shot a male on the western slope 

 of the Stanowoi Mountains, on the Ujan river, on the 23rd May, but did not meet with it on the 

 eastern slope. Dr. Eadde shot a male on the 17th May at the Tarei-nor, and met with it in 

 June near Irkutsk, more especially in the Kaja valley. It appears to be very common in Dauria, 

 where it breeds ; and, according to Colonel Prjevalsky, it is " tolerably common in the mountains 

 of S.E. Mongolia, especially at Muni-ul. In Northern Ala-Shan, about the beginning of May," 

 he writes, " we saw several on the steppes, on migration, and here also this lively bird has the 

 same habits as in other localities. It is scarce in the Ussuri country ; and I cannot say if it 

 breeds there or not." In China it is evidently a very common species, as large numbers have 

 been sent from there. Pere David says that it is often seen near Pekin in May and June and, 

 especially, in August and September; and Mr. Swinhoe, who found it at Amoy, South-west 

 Formosa, Taiwanfoo, and Chefoo, says that it is common in South China on passage, but he did 

 not find it breeding there. It also occurs in Japan. Von Schrenck obtained it from the Kurile 

 Islands ; and, according to Meves, Von Middendorff found it at Ochotsk. 



Southward it ranges in winter down to the Malay archipelago. Mr. A. O. Hume states 

 (Stray Feathers, i. p. 495) that it is found everywhere in the cold season from Ceylon to 

 Peshawur in the west, and Debroogurh in the east, and he received it from Tenasserim and the 

 Andamans. I have examined specimens from the latter locality collected by Captain Wardlaw 

 Ramsay, and also from Maingay, Malacca; and it has been obtained in Flores, Ternate, Timor, 

 Gilolo, Labuan, and Borneo. 



It has also once been obtained on the American continent, at St. Michael's, Alaska, by 

 Mr. Pease. Mr. G. R. Gray (Hand-1. of B. i. p. 215) gives " Egypt " amongst the localities where 

 this species occurs ; but this must be an error, as, so far as I can ascertain, it has never been 

 obtained in Africa. 



Until recently but little was known of the habits of this Warbler ; but, thanks to the successful 

 researches of Mr. Meves, Mr. Seebohm, and Mr. Collett, there are now most excellent notes both 

 on its general habits and nidification. I transcribe above Mr. Collett's notes in extenso ; and 

 there are some most interesting notes by Dr. Dybowski, communicated by Mr. Taczanowski 

 (J. f. O. 1872, p. 358), which I translate as follows: — "This bird arrives (in Dauria) late in May 

 or early in June, at which time the entire district resounds with its song, as it does in the autumn 

 with the chirping of the locusts. Its note consists of the syllables tsi, tsi, tsi, tsi uttered in quick 

 succession ; and if several are singing at once, it sounds like an uninterrupted humming all through 

 the forest. Until the middle of June they frequent the birch-woods in the valleys, where they 

 may be seen flitting about the tops of the trees feeding on insects. About the middle of June 

 they divide in pairs, leave the valleys, and resort to higher altitudes to breed. They nest in the 



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