Mr. H. Seebohm on the Ornithology of Siberia. 4 
uttering their various alarm-notes as they flew round or 
waited on some shrub or plant with their bills full of mos- 
quitoes, anxious to feed their young as soon as I was out of 
their way. As I was returning to the shore, and descending 
a steep sloping bank covered with patches of dwarf birch and 
willow, overlooking a flat willow-swamp which evidently once 
formed a little delta at the mouth of the dried-up Doo-din’-ka, 
my attention was attracted by a pair of Dusky Thrushes 
loudly proclaiming the vicinity of their nest. I shot one of 
them, and, after a diligent search of half an hour, found the 
nest in the fork of a willow bush level with the ground. It 
was exactly like the nest of a Fieldfare, lined with dried 
grass, and contained, alas! five young birds about a week old. 
At noon we weighed anchor; but at midnight it was blow- 
ing such a stiff gale that we were afraid to round the “ broad 
nose ” of Tol-stan-os’ in the ‘ Ibis ;’ so we cast anchor under 
the lee of the mud cliffs of the Yen-e-say’, and I again went 
on shore. In some places the cliffs were very steep, and were 
naked mud or clay. In others the slope was more gradual, 
and was covered with mud and alder bushes. Among these 
bushes I found the Dusky Thrush again breeding, but was , 
only able to find one nest with five nearly fledged young. 
The nest was placed, as before, in the fork of a willow, level 
with the ground. This was the last time that I saw this 
species of Thrush. 
There is considerable variation in the colour of the skins 
of this species which I brought from the Yen-e-say’, espe- 
cially in the amount of black on the breast and red on the 
upper plumage. Some specimens have more or less rufous 
on the tail-feathers, approaching 7. nawmanni. One male in 
particular has scarcely any red tinge in the plumage, and has 
even grey instead of chestnut axillaries. The young in nest- 
ling plumage differ from the young of T. pilaris, T. iliacus, 
T. obscurus, and T. atrigularis, in having more buff on the 
wing and less buff on the breast. 
TuRDUS oBscURUS, Gm. 
During the first week of June the forests were practically 
[47] 
