664 Mr. S. A. Buturlin on the 



visited that place in the spring, but that the case was quite 

 exceptional. 



So I think that theTas-khayakh-tag Mts., a wild and craggy 

 watershed between the Yana and Indigirka basins, must form 

 the western limit of the breeding-ground of the Rosy Gull, 

 as it is also the western limit of Tringa sakhalina Vieill., 

 Colymbus pacificus Lawr., Somateria fischeri Brdt. ; and the 

 eastern limit of Tringa alpina, Numenius minutus Gould, 

 Pcecile lenensis Pall, {obtecta auct.), and other birds. The 

 southern limit of the Rosy Gull is at about 67|° N., and it 

 has not been met with breeding north of 70°. 



Young birds when just killed have blackish-brown eyes 

 and the edges of the eyelids (not prominent) of the same 

 dark colour. The feet are reddish fleshy, with a slight bluish 

 tinge and blackish nails, and with the upper parts of the 

 tarsus swollen (as is usually the case with young waders). 

 The bill is greyish brown, paler on the proximal half and with 

 the base of the mandible flesh-coloured ; this pale colouring 

 is only just visible in the older specimens, but extends over 

 two-thirds of the base of the bill in the youngest specimen. 

 The wing is more rounded than in the old bird, the primaries 

 not being yet fully developed, so that the second is longest, 

 the third about five mm. and the first about ten mm. 

 shorter. The tail also is not so cuneate as in the adult, and 

 the central pair of rectrices in the youngest specimen is 

 shorter than the others ; nevertheless the form of the tail 

 is plainly cuneate, each inner pair of feathers being some- 

 what longer, so that the external pair is some 12-17 mm. 

 shorter than the longest of the innermost rectrices. 



The young birds are fully feathered, the oldest having no 

 trace of down, and the youngest only traces on the forehead, 

 ear-coverts, and chin. I speak of my Ssukharnoe specimens, 

 but that from Ssredny-Kolymsk has down still adherent, not 

 only on the feathers of the head and neck, but also on those 

 of the thighs and upper tail-coverts. 



The first plumage of the Rosy Gull is as follows : — All the 

 under-parts white, strongly tinged on the chest and breast with 

 pale greyish cinnamon-buff, this hue being richer and more 



