Xx 
B.—-NON-BREEDING VISITORS. 
4, Accidental Visitors (41 Species)—continued. 
i ue LARIDA Family COLYMBIDA 
Subfamily STERCORARIIN , : SEN Ne 
Gea Nie Fetienias siren eis EE bat eg Diver. Colymbus adamsi, 
hactes, (Linn.) eo 
Family PROCELLARIIDA Family PODICIPID 
Leach’s Petrel. Procelleria leucorrhoa,| Kared Grebe. Podiceps nigricollis, C 
Vieill. L. Brehm. i 
Greater Shearwater. Puffinus major, eae 
Faber. 
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 specifie rank is disputed. 
C.—HYBRIDS. 
Family TETRAONID 
Tetrao tetrix 8 + Tetrao urogallus 2 (“ Rakkel-Hane,”’ male and female). 
Lagopus albus 8 (2) + Tetrao tetrix 9 (2) ( Rype-Orre,” male and female). 
Lagopus albus 8 + Tetrao urogallus 9 (‘‘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. Vidensk, Sels, Forh., 1890, 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’. candicans, 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, /. 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 / gyrfaleo, was as 
long ago as 1780 named by Fabricius in his Fauna Groenlandica, F. rusticolus 
(and its immature form, /. fuscus), after the species described in 1766 under that 
name in Linneus’ Syst. Wat., ed. xii. Although Linnzus’ description of 7’. 
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: “ea Swecia,’ a country, where the species can, et 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 &. islandus). 
