Mr. H. Scebohm on the Ornithology of Siberia. 13 



those of our Willow-Warbler, but more spotted than usual, 

 and smaller in size. I did not meet with this bird further 

 north than lat. 70, nor did I see it on the return voyage. 



ACROCEPHALUS SCHCENOB^ENUS (Linn.). 



It is rather remarkable that the Sedge- Warbler should 

 have hitherto been overlooked in Siberia. It arrived on the 

 Arctic circle on the 15th of June, and soon became very 

 abundant ; but I did not observe it further north than lat. 67. 



ACROCEPHALUS DUMETORUM, Blyth. 



I did not meet with this bird until the 8th of August, 

 on my return journey, in lat. 62, where it was evidently 

 breeding. 



Lo^USTELLA CERTIIIOLA (Pall.). 



As I passed through Yen-e-saisk' on my return journey, 

 towards the end of August, I found this rare Grasshopper- 

 Warbler breeding in the swampy thickets near the banks of 

 the river. The young in first plumage from this locality will 

 be described and figured in Dresser's ' Birds of Europe/ 



I found it very shy and skulking in its habits. The young 

 birds, some only half fledged, were still in broods ; and occa- 

 sionally I got a shot at one which left the sedges and ventured 

 into the willows. They were calling anxiously to each other, 

 the note being a harsh tic, tic, tic. 



Authentic skins of this bird in first plumage, now for the 

 first time obtained, are very interesting. They prove that 

 the various skins to be fouud in collections labelled L. ocho- 

 tensis by Dyboffsky, from Lake Baical, are simply the young 

 of L. certhiola. The general colour of the under parts of the 

 young in first plumage is buffish yellow, darkest on the breast 

 and flanks, and inclining to chestnut on the under tail-coverts. 

 In first winter plumage this yellow tinge is retained ; but it is 

 lost in the spring moult, the general colour of the underparts 

 being then buffish white, darkest on the breast, flanks, and 

 under tail-coverts. A third state of plumage is that of the 

 adult after the autumn moult, in which the buff" of the under- 

 parts almost approaches chestnut. In this state (gradually 

 becoming duller by abrasion as the winter wears on) it is the 



