IS R- COLLETT. [No. 11. 



About 50 spechnens of this hybrid have been found, up to the 

 present, within the borders of Norway, eight of them having been 

 females, the rest males. The majority have been found since 

 1870, from eighteen to twenty having been obtained betvveen 

 1892 and 1902 alone, several of these having come from about 

 the same districts in Nordland (namely the inner parts of Rånen). 



Almost all of this large number I have been able personally 

 to examine, either in the flesh, as acquired by the Christiania 

 Museum 1 , or from the other museums of the country; and on 

 several occasions I have given accounts of the specimens succes- 

 sively found. 



Parentage. As is well known, light has recently been throvvn 

 upon the parentage of the Rype-Orre, Prof. Lonnberg 2 (in Swe- 

 den) having produced apparently unmistakable proofs that L. 

 lagopus is the father. 



Dimensions. The total length of the male averages from 

 480 to 485 mm , and in larger males may be as much as from 

 500 to 510 mm . The length of the wing is on an average about 

 250 mm , that of the tail (the outermost pair of tail-feathers) 140— 

 144 mm . 



The female has an average total length of 424 mm , length of 

 wing 205 mm , and of tail about 122 mm . 



Colour. The Rype-Orre is chiefly known in its winter plu- 

 mage, and there are several specimens of young males in a tran- 

 sition plumage between the first, unmoulted, autumn plumage 

 and the winter plumage. The winter plumage seems to be changed 

 late; there is a male specimen in the Tromsø Museum, caught 



1 Forh. Vidensk.-Selsk. i Christiania, 1S72, p. 238 (Christiania, 1872); 

 Nyt Mag. for Naturv., B. 23, p. 159 (Christiania, 1877) ; Nyt Mag. f. Naturv., 

 B. 26, p. 324 (Christiania, 1881); Proc. Zool. Soc. London, 1886, p. 221-, 

 Pl. 21 (London, 1886); Nyt Mag. f. Naturv. B. 35, p. 161 (Christiania, 

 1894j. 



2 Svenska Jågareforb. Nya Tidskr. 42de Årg., p. 47 (Stockholm, 1904) ; 

 Proc. Zool. Soc. Lond., 1904, p. 411 (London, 1904). 



