B. -NON-BREEDING VISITORS. 



4. Accidental Visitors (41 Species) continued. 



Family LARIDJ3 

 Subfamily STERCORARIIN^E 

 Common Skua. Stercorarius catarr- 

 hactes, (Linn.) 



Family PROCELLAR1ID.E 



Leach's Petrel. Procelleria leucorrkoa, 



Vieill. 

 Greater Shearwater. Puffinus major, 



Faber. 



Family COLYMBID.E 



Yellow-billed Diver. Colynibus adamsi. 

 Gray. 



Family PODICIPLlhE 



Eared Grebe. Podiceps. nigricoll'is, C. 

 L. Brehm. 



Amongst the above enumerated forty-one " Accidental Visitors." are counted as 

 distinct species, the Greenland Falcon,* Hierofalco islandus, and the Iceland 

 Falcon, Hierofalco rusticolus* whose title to distinct specific rank is disputed. 



Tetrao tetrix 

 Lagopus albus 

 Lag opus albus 



C. HYBRIDS. 

 Family TETRAONIDJS 



? + Tetrao urogallus ? (" Rakkel-Hane, " male and female). 

 $ (?) + Tetrao tetrix ? (?) (" Rype-Orre," male and female). 

 $ + Tetrao urogallus ? ("Rype-Tiur/'male.) 



* This nomenclature for the Gyrfalcon (or - falcons) is best explained by a 

 quotation from a former paper by Prof. Collett, entitled " Om 6 for Norges Fauna 

 nye Fugle, fundne in 1887-1889 " (Christa. V'idensk. Sels. Fork., 18'JO, No. 4, p. 7) 

 Transl. 



F. islandus, or the white Greenland falcon, which is most frequently referred to 

 under Gmelin's later name of F. candieans, is known principally from Greenland, 

 and the majority of examples preserved in the Museums come from there. It nests 

 there in the more northern districts (north of the Arctic circle), but is tolerably 

 frequent in South Greenland during the periods of migration and in the winter. 



In the southern parts of Greenland there also occurs, very numerously, the 

 real Iceland Falcon, which was named by Gmelin in 1788, F. islandus, under 

 which name it has hitherto been entered by most writers (including the present 

 author in Nyt. Mag. f. Naturv., B. 26, p. 329). This form, which is regarded by 

 most writers as a light climatic race of the North European F. gyrfalco, was as 

 long ago as 1780 named by Fabricius in his Fauna Groenlandica, F. rusticolus 

 (and its immature form, F.fuscvs), after the species described in 1766 under that 

 name in Linmeus' Syst. Nat., ed. xii. Although Linnseus' description of F. 

 rusticolus in the place quoted, may no doubt pass for the Iceland species, the prob- 

 ability is somewhat lessened that he really had it before him, because he states 

 as its habitat : "ex Suecia" a country, where the species can, at the present time, 

 scarcely be said with safety to occur. It is therefore safest to date the name F. 

 rusticolus for the Iceland species from Fabricius 1780, since that author unquestion- 

 ably had just that species before his eyes (and likewise the white Greenland 

 falcon for his description of F. islandus). 



