52 NORTHERN ZOOLOGY. 



Dimensions 

 Of the female. 



Inches. Lines. Inches. Lines. 



Length from the tip of the bill to the end of Length of the bill from the angle of the 



the tail 25 mouth 1 9 



,, of the tail .... 10 „ of the tarsus .... 3 3 



,, of the longest quill feather .16 „ of the middle toe ... 1 10 



,, of the bill measured along its ridge 1 6 



[16.] 3. Buteo lagopus. Rough-legged Falcon. 



Genus. Buteo. Ray. 



Rough-legged Falcon. Penn. Arct. Zooh, ii., p. 200, No. 92. Old female. 



Chocolate-coloured Falcon. Idem, ii., p. 201, No. 94, pi. 200, f. 2. ? * 



Placentia Falcon. Lath. Syn. Suppl.,\>. 19, sp. 57. Old bird, autumn. Idem, Syn., i., p. 76, sp. 57- ? 



Falco lagopus. Lath. Tnd., i., p. 19, sp. 33. 



Falco Sclavonicus. Idem, i., p. 26, sp. 54. 



Falco spadiceus. Idem, i., p. 27, sp. 57, excl. syn. Phil. Trans. 



Buse gante'e. Vaill. Ois. d'Afr., i., pi. 18. 



Rough-legged Falcon. {Falco lagopus.) Wilson, iv., p. 59, pi. 33, f. 1. 



Falco lagopus. Temm., i., p. 65. Bonap. Syn., p. 32, No. 18. 



Plate xxviii. 



A specimen of this bird, in most perfect plumage, was killed in the month of 

 September, by Mr. Drummond, on the Smoking- River, one of the upper branches 

 of the Peace River. It arrives in the fur-countries in April or May, and, having 

 reared its young, retires southwards early in October. It winters on the banks of 

 the Delaware and Schuylkill, returning to the north again in the spring. It is by 

 no means an uncommon bird in the districts through which the Expedition tra- 

 velled, but, being very shy, only one specimen was procured. A pair were seen 

 at their nest, built of sticks, on a lofty tree standing on a low, moist, alluvial point 



* Although the Chocolate Falcon of Pennant must belong either to this species or to that of F. Sancti-Johannis, 

 yet the Chocolate Falcon of Forster, with whom the name originated, is evidently a different species, perhaps the 

 young of F. cyaneus. This author does not describe his specimen, but merely says that it is smaller than the Moor 

 Buzzard, which it much resembles. Had this bird been the F. lagopus, he could scarcely have overlooked the feathered 

 legs. The Bay Falcon, var. A., Latham (Syn., i., p. 54, No. 34), is merely a reference of Forster's bird to the 

 Moor Buzzard. The description of the Placentia Falcon of the same author (Syn., i., p. 76, sp. 57) was taken from 

 a drawing, and will apply either to F. lagopus or F. Sancti-Johannis ; but the Placentia Falcon, described in his 

 Supplement (p. 19, sp. 57), is undoubtedly F. lagopus, and agrees in every particular with the one we have described 

 in the text. 



