FALGONIDJE — FALC0NIN2E : FALCONS. 





500. 



Labrador into U. S. in winter. {F. lahradora, Aud, folio pi. I'Jfi.) I have seen it perfectly 



dark, — no raarl<ings whatever. 



F. islan'dicus. (Lat. form of Icelandic.) Iceland Gykfaloon. Resen.ldiug Z'. .s«e«- as 

 above described, and probably not fairly separable ; on an average lighter clored, nx.re ex- 

 tensively white helow, the head and neck lighter than the rest of the upper parts. 

 This form occm-s in Iceland and southern Greenland, straggling in wmter into the N. K 

 U. S. 



Fig. 376. —Lanner Falcon, Jnat. size; not distinguisliable in tlie cut from the Prairie Falcon. (From Brehm.) 



501. 



P. can'dicans. (Lat. candicans, whitening.) Greenland Gyrpalcon. The e.xtreme 

 form, averaging when adult asvphite as a snowy owl. Head, neck, and under parts pure vyhite, 

 with few dark touches if any. Back, wings and tail with white and dusky in about equal 

 amounts, or former rather prevailing, giving the ground color, on which tlie dark appears in 

 bars, crescents, and cordate spots. Bill and feet light. This form is characteristic of Greenland, 

 straying south in winter; but I know of no case of its occurrence in the U. S. 



