284 



FALCO GYRFALCO. THE GYR FALCON. 



JER FALCON. JERKIN. ICELAND FALCON. GREENLAND FALCON. 



Falco rusticolus. Linn. Syst. Nat. I. 125. Adult. 



Falco Gyrfalco. Linn, Syst. Nat. I. 130. Adult. 



Falco islandicus. Lath. Ind. Orn. I, 32. Adult. 



Falco Gyrfalco. Lath. Ind. Orn. I. 32, Adult. 



Falco sacer, B. Lath. Ind. Orn. I. 34. Adult. 



Jer Falcon. Mont. Orn. Diet. 



Faucon Gerfaut. Falco islandicus. Temm. Man. d'Orn. I. 17 ; III. 9. 



Jer-Falcon. Falco islandicus. Selb. lUustr. I. 36. 



Falco Islandicus. Jer-Falcon. Jen, Brit. Vert. An. 81. 



Adult of both sexes white, having the upper parts marked with 

 semilunar or sagittiform dark-grey spots ; the bill light blue, the 

 cere and feet pale-yellow. Young brownish-grey above, spotted 

 with yelloivish or reddish-white, the tail with numerous light bars, 

 tchich on the middle feathers are generally opposite, but sometimes 

 alternate, the lower parts yelloivish-white, longitudinally spotted 

 with duskv. 



