131 



283a. 



283b. 



283c. 



Falco rusticohis islandus [partim] Briin- 

 nich, Orn. Bor., p. 2 (1764). [Iceland. \ 

 Iceland Falcon. 



Size similar ; much darker above and be- 

 low ; above more sooty and with trans- 

 verse markings darker ; rump uniform 

 without markings ; thighs dark slaty, 

 with buffy white transverse spots. Im- 

 mature : very much darker ; uniform 

 dusky brown above. 



Falco rusticohis obsoletus Gmel., S.N. i., 

 p. 268 (1789). [" Freto Hudsonis"] [=F. 

 labradorius, auct.J 

 Labrador Falcon. 



Very slightly larger ; wing (J 14.35-14.90, 

 $ 16-17 in. ; general colour white, the 

 feathers above marked with a slaty black 

 spot towards tip ; tail pure white and 

 head nearly so ; below with sHght stria- 

 tions on flanks only. Immature : mark- 

 ings much heavier and browner ; head 

 with dark stripes and tail with transverse 

 dark markings. 



Falco rnsticolits caiidicans* Gmel., S.N. i., 

 p. 275 (1789). [' Islandia et Scotia," er- 

 rore, type loc. subst. Hartert — Greenland.'] 

 Greenland Falcon. 



Iceland and 

 S. Green- 

 land, S. in 

 winter to 

 Brit. Isles, 

 Europe and 

 N.E. 

 America. 



Labrador 

 Newfound- 

 land. 



Greenland 

 & Arctic 

 America ; 

 in winter to 

 Brit. Isles ; 

 N.W. 

 Europe ; 

 Northern 

 United 

 States. 



* The Gyrfalcons visiting Canada and the Northern United States in 

 winter appear to be dark immature birds of this form, and not F. r. rusticolus 

 as stated in the A.O.U. Cneck List (1910). 



