Oedee ACOIPITRES. 



Superfamily ACCIPITROIDE^. 

 Family FALCONID^. 



90. Palco rusticolus Lin. 



n58.—Falco rusticolus Lin., Syst. Nat., 10 eil., L p. 88.— /d., Syst. Nat., 12 ed., I, p. 



125(1766). — FABRiciU8,FaunaGrcenl..p.55(1780). — MoHR.IslandskNaturh., 



p. 19 (jpart) (1786).— Gmelin, Syst. Nat.. I, p. 268 (1788).— Latham, Ind. 



Orn., I, p. 28 (1790).— Stkjnegeu, Auk, 188.5, p. 188. 

 1764.— Falco islandus BrOnnich, Orn. Bor., ]^. 2, No. 9.— Gmelin, Syst. Nat., I, p. 271. 

 1776. — Falco islandus fuscus Mullek, Prodr. Zool. Dan. (p. 7:J et p. viii, fide Fabr.). 

 1780. — Falco fuscus Fabiucius, Fauna Groen]., p. 56. 

 1783.— Falco gyrfalco Boddaert, Tabl. PI. Enl. (pi. 210). p. 13 (nee LiN.).— Taczanow- 



SKi, Bull. Soc. Zool. Fiance, 18d:<, [). 3:51. 

 1788. — Falco candicans J3 islavdicans Gmeun, Syst. Nat., I, p. 275.— SCHLEGEL, Rev. 



Crit., p. i (1844).— 7r/., Abli. Zool. Anat., I. p. 14 (1884). 

 1800. — Falco islandicus Daijdin, Tr. d'Orn., II. p. 100. — Brehm, Lelirb. Vog. Eur., p. 



44 (1823). 

 1800.— Falco groenlandicus Bavdis, Tr. d'Orn., II, p. 107.— Brehm, Isis, 1826, p. 990. 

 1854. — Falco arcticus H()Lb5ll, Zeitschr., Ges. Nat., Ill (p. 426) (nee F. communis /* 



arcticus Gmel., 1788). 

 1862. — Falco gyrfalco f/roenlavdicus Sciilegel, Mus. P. B. Falconos, p. 13. 

 1862. — Falco gyrfalco islandicus Schlegel, Mus. F. B. Falcones, p. 14. 

 1873.— Falco holbccUi Sharpe, P. Z. S., 187.J, p. 415. 

 lS82.—Hicrofalco gyrfalco sacer Bean, Pr. U S. Nat. Mus., 1882, p. 161 {nee FoRST.). 



loo., ^ ^«^^<>^2"-/«'^''-^«"^'"'""Mseebohm, Brit. B. Eggs, I, p. 16. 

 I Falco candicavs-gyrfaho ) 



1884. — Bierofalco islandus a. holboelU Gurney, List Diurn. B. Prey, p. 111. 



The Gray Gyrfalcon, as Mr. Guruey appropriately calls this form of 

 the circumpolar species, usually referred to as Falco gyrfalco, was the 

 only form obtaiued on Bering Island during the winter. It was at that 

 season by no means uncommon, and fed chiefly on the numerous field- 

 mice which now infest that island ; but, being very shy, specimens were 

 only secured with great difficulty. Whether this species also breeds 

 on the island, I am unable to say, but the female, shot as late as May 

 5, had the ovaria in such a condition as to make it probable that she 

 was going to breed there. This specimen was just changing from the 

 young to the adult plumage. 



The adult female (No. 101193), a very fine specimen in perfect i^lumage, 

 was collected by Mr. Grebnitski after my departure and kindly pre- 

 sented to me. 



203 



