284 THE BIRDS OF MONGOLIA ETC. 



me to be larger than the European ones, measuring in their longer diameter 

 2''*06 and in their shorter diameter 1'''42. 



On comparing our Mongohan and Northern-Tibet specimens with 

 European birds, we find that the former are rather larger. 



Measurements : — 







Lengtli. 



Width. 



Wing. 



Tail. 



Culm en. 



Tarsus 



c?. 



N. Tibet . 



in. 



. 27 



in. 

 54 



in. 

 19-6 



in. 



11-7 



in. 

 3-2 



in. 



? 



6. 



Tsaidam 



. 25-5 



51 



18-3 



10-5 



3 



3 



$. 



Koko-nor . 



. 24-5 



50 



19 



10-4 



3 



2-56 



134. CoRvus oRiENTALis, Evcrsm. Vorona chernaya. 



Differs from C. corone by its larger size and more rounded tail. We 

 met with it throughout Mongolia and Kan-su, and once at Koko-nor, but 

 did not find it at all in Tsaidam and Northern Tibet. Contrary to the habits 

 of the Raven, it never ventures into the desert of Gobi, and is common in 

 Ala-shan and about the city of Din-un-in. 



Pere David met with C sinensis, Gould ; but as we have not got any 

 specimens ourselves, I do not name it in my list of Mongolian birds. 



Measurements of a male from Koko-nor — length 20", width 39", wing 

 13''''8, tail 8"-l, tarsus 2"-32, gape 2"-4, thickness of the bill at the base 0"-8. 



In Ussuri country it is very common, especially about settlements and 

 villages, but is also abundant in the forests. Many leave this district for the 

 winter, probably for the southern parts of Manchuria and Corea ; and those 

 which remain for the winter keep usually near the habitations of man. 



135. Frugilegus pastinator, Gould. Gratch. 



Is extremely common in S.E. Mongolia during migration, but very 

 seldom remains there to breed ; in Ala-shan and the Hoang-ho valley it is 



