586 Mr. J. H. Gumey's Notes on 



service in establishing a diagnosis between the closely related 

 races of the Grey Jcr-Falcons. 



The British Museum possesses a specimen obtained by 

 Captain Kellett in California*, and another from Kotzebue 

 Sound; the Norwich Museum has one example from Alaska 

 and three from Hudson^s Bay ; but none of theseFalcons are 

 in adult dress. The following are the measurements of these 

 six sj^ecimens : — 



Males. 



Wing. Tarsus. Middle toe s. u. 



in. in. in. 



Alaskat 15-05 200 1-95 



Hudson's Bay % 14-80 2-10 I'SO 



Fort ChurcMll, Hudson's Bay . . 14-20 2-00 2-05 



Giilf of California 14-30 215 2-05 



Females. 

 Fort Chui'chill, Hudson's Bay . . lG-60 2-10 2-30 



Kotzebue Sound 16-00 2-10 2-10 



I may quote, for comparison with the above, the under- 

 mentioned dimensions of six specimens, given by Mr. Ridgway 

 in the ' Land-Birds of North America,^ vol. iii. pp. 115, 116. 



Wing. Tarsus. Middle toe s. u. 



inches. inches. inches. 



Three males § 13-35 to 14-25 2-15 to 2-40 1-80 to 1-95 



Three females |1 15-50 to 16-00 2-35 to 2-55 2-00 to 2-15 



* In Mr. Sharpe's Cat., vol. i. p. 417, this specimen is stated to be fi-om 

 the remarkably southern locality of the Gulf of California. 



t This specimen is from the Smithsonian Institution, and was there 

 marked as a male ; the sex of the others has been inferred from their 

 dimensions. 



X This example is as dark as some specimens of H. labradonis, but has 

 the inner webs of the primaries regularly graduated with pale crossbars, 

 instead of being irregularly mottled with buiJy brown, as is usual in the 

 Labrador Falcon ; the central pair of rectrices are quite free from bars 

 and spots, and the plimiage of the mantle very nearly so. This specimen 

 closely resembles the figure of the immature //. gyrfalco in Gould's 

 'Birds of Great Britain.' 



§ One from Yukon, one from Nulato, Alaska, the third also from 

 North-west America, but the exact locality not mentioned. 



II Two from Fort Anderson, the third also from North-west America, 

 but the exact locality not mentioned. 



