162 LIST OF DITTRNAL BIRDS OF PREY. 



Falcon, except upon the forehead ; in the absence of these 

 white edges the Fort-Anderson specimen agrees with two 

 Lapland examples in the Norwich ]Museum, both of which I 

 consider to be more fully adult than that from Langfjord. 



No. 1564. Alaska. — This Falcon so closely resembles that 

 last mentioned that the same remarks apply to both. 



No. 51,690. Male: Yukon (referred to in the 'Ibis^ for 

 1882, p. 584). — This specimen I now refer to H. gyrfalco, 

 and consider its plumage to be very fully adult, more so 

 than that of the two preceding ; it agrees in coloration with 

 an adult female, shot from the nest in Lapland, which was in 

 the collection of the late Mr. Wolley, and is noAV No. 1 of 

 this species in the Norwich Museum. 



No. 43,142. No locality or sex marked, but apparently a 

 female (referred to in the abis' for 1882, p. 584).— This 

 specimen is in immature plumage as regards the mantle, but 

 elsewhere has assumed adult dress ; it agrees with a female 

 H. gyrfalco in a similar stage of plumage (No. 3 in the 

 Norwich ]Museum), which was obtained in Lapland by Mr. 

 Wolley, having been shot from the nest in March 1855. 



No. 35,451. Male: Yukon River, June 1862 (referred to in 

 the 'Ibis' for 1882, p. 583). — I examined this specimen in 

 1872, and then noted that it agreed " very well with a very 

 adult male, from Iceland," of H. islandus, now in the Norwich 

 Museum, and No. 2 in the series of Iceland Falcons there 

 preserved. On my recently rene^-ed comparison of these two 

 specimens, the general agreement of their appearance was 

 obvious; but upon a closer examination I found that the 

 Yukon male differs from the Icelandic in the feathers on the 

 crown of the head being much more narrowly bordered with 

 whitish, and in the pale cross bars on the lower part of the 

 back being greyer and less distinctly white, their colour thus 

 resembling that of the corresponding transverse bars in the 

 adult H. gyrfalco ; but on the interscapular feathers and on 

 those of the lesser and median wing-coverts the light bars 

 are, on the contrary, a decidedly piu-er white than is usual 

 in the Scandinavian adults of H. gyrfalco ; indeed I have 

 only seen one Scandinavian Falcon like it in this respect, and 



