99 fVol. xl. 
collection, and in going over them it was discovered that 
not only were all the above-mentioned forms, with the 
exception of Pallas’s P. caudata, perfectly good, but that 
yet another form occurs in the Krasnoyarsk district in the 
upper basin of the Yenesei and thence eastward to Irkutsk, 
at least as far as the western rim of the Amur basin. This 
form may be distinguished by a peculiar and characteristic 
smokiness pervading the plumage, and, once noticed, it was 
possible, as both Dr. Lowe and I found, to pick the birds out 
from amongst the rest of the series contained in the box 
without any reference to their labels or localities. All these 
birds so picked out came from the Krasnoyarsk, Tataschew, 
or Irkutsk districts ; while those left behind were all from the 
Altai, Thian Shan, or Western Mongolia. 
As this form appears to be a perfectly good and distinct 
subspecies of Uragus sibiricus, occupying a definite area, 
I have decided to describe and name it :— 
Uragus sibiricus fumigatus, subsp. nov. 
Size about as in true sibiricus, with which it agrees in 
markings, though differing in that the whole of the plumage 
of fully adult specimens, more especially in winter, is suffused 
with a peculiar smoky grey, which has the effect of making 
the bird appear dark, the rose of the head, mantle, and breast 
assuming a vinous tinge. This washing of smoky grey occurs 
in both sexes, though it varies to a certain extent in individuals 
according to age and season. In the lightest males it shows 
more as a dirtying of the whitish of the upper parts—head, 
mantle, etc..—which in true sibiricus is a beautiful clear or 
clean pinkish white or rose-pink. 
Description.—Forehead and face deep, vinous crimson ; 
crown pale, shiny pink, the feathers tipped with dirty white ; 
mantle generally smoky-grey, mid-streak of feathers blackish, 
centres vinous, edges smoky-buff ; rump light vinous crimson, 
not rose-pink as in true sibiricus ; wing-coverts white or 
greyish white; primaries finely and secondaries broadly 
edged with white, almost the whole outer web of the latter 
being white as in true sibiricus ; outer three rectrices almost 
