13 Mr. H. Seebohm on the Ornithology of Siberia. 
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. 
AcCROCEPHALUS SCH@NOBENUS (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. 
LocusTELLA CERTHIOLA (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 mits 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 fie, tie, tie. 
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 Dybofisky, from Lake Baical, are simply the young 
of L. certhiola. The general colour of the underparts 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 
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