FURTHER NOTES ON THE BIRDS OF GILGIT. 263 
darker than in any specimen of 7. rw/icollis, and easily distin- 
guishable from that of TZ. atrogularis. 
It is apparently Dybowski’s 7. hyemalis; but I leave it for 
Mr. Seebohm to pronounce on its merits as a hybrid ora 
good species. Mr. Seebohm’s collection contains a similar 
specimen from Lake Baikal; and I have also one shot in 
Yarkand. 
67.—Turdus atrogularis, Tem. (365.) 
When I wrote concerning this species in a former paper 
(Jbis, 1881, p. 53), I did not observe that I had before me a. 
specimen of an adult male in a melanistic form of plumage. 
The feathers of the head and hinder part of the neck are 
tinged with black; the tail is much darker than in other spe- 
cimens ; and the axillaries and under coverts are dull brown. 
All other specimens that I have seen have the axillaries and 
under wing-coverts dull rufous. 
70.—Trochalopterum lineatum, Vigors. (425.) 
My Gilgit specimens of this Babbler are much paler than 
those I have from Cashmere, which, again, are paler than 
those sent me by Mandelli. The difference between Gilgit 
and Simla forms, however, is greater than between the 
Simla and Darjeeling forms. Specimens of Sibia capis- 
trdia from Murree and Sikkim show the same differences of 
colouration. 
72.—Pratincola indica, Blyth. 
Pratincola maura, Pall. (483.) 
73.—Pratincola robusta, Tristram. 
Dr. Scully has shown (/bis, 1881, p. 441) that our large 
Gilgit Busli-Chat is not Canon Tristram’s species; but I can- 
not allow that all the Chats of the P. indica (or maura) type 
are referable to a single species. My collection contains 
forty-eight adult specimens from different localities. These 
show two races, more or less well marked, and differing in 
size and colour, but connected by intermediate forms, which 
may be hybrids, as the two races apparently exist side by 
side in Gilgit and in some other localities. As in some spe- 
cimens the measurements slightly overlap, I have not taken 
difference of size as a point of diagnosis, but simply colour. 
The males show a constant difference in the amount of white 
on the back part of the neck. The race which I will call 
Form A shows a white patch on the side of neck, but 
not extending round to the back of it. In no specimen is 
34 
