FALCONID^ — XLV. Ill 



fff. No raff; 4 primaries emargiuatc ; tail coverts white ; tail 

 black. AsTURiNA, 9. 



/. FALCO, Linn^us. Falcons. 



* First primary only emarginate on inner web ; 2d longest, 1st 

 shorter than 4tli ; tarsal plates small ; sexes colored alike. 



f Tarsus not longer than middle toe, scarcely feathered below 

 joint. {Falco.) 



1. F. peregrinus, Tuiist. Peregrtxe Falcon. Duck 

 Hawk. Blackish ash with paler waves; below whitish, 

 barred; black cheek patches; L. 16; W. 13; T. 7. U. 

 S., not common. 



ff Tarsus longer than middle toe and claw, feathered for some 

 distance. {Hierofalco, Cuv.) 



2. F. saccr, Forst. Gyrfalcon. Tarsus feathered 

 half way dow^n, with only a bare strip behind; white or 

 ashy with dark markings; L. 24; W. 16; T. 10. Northern 

 regions of both continents; var. islandicus^ S. to U. S. 

 in winter. {F. gyrfalco^ L.) 



3. F. mexicanus, Licht. Lanier Falcon. Tarsus 



feathered ^ way down; general color brown; L. 18; W. 



14; T. 8. S. W., E. to Ills. 



** Two primaries emarginate .• tarsal plates enlarged in front, 

 appearing like scutella. 



X Tarsus about equal to middle toe ; basal joints of toes without 

 transverse scutella. {^salon, Kaup.) 



4. F. columbarius, L. Pigeon Hawk. A:merican 



Merlin. Ashy blue or l)lackish above, variegated 



below; L. 13; W. 8; T. 5. U. S. 



\i Tarsus longer than middle toe; basal joints of toes with 

 transverse scutella. (Tinnunculus, Vieill.) 



5. F. sparverius, L. Sparrow Hawk. Rusty - 

 Crowned Falcon. Back tawny; wings bluish and 

 black; seven black blotches about head; tail chestnut, 



