FALCONING. FALCO, 
15 
Male, 22, 47. Female, 25, 51 1. 
From Texas to North Carolina. Rather abundant. Up the Missis- 
sippi and Ohio to Louisville. Accidental in Pennsylvania. Migra- 
tory. 
Swallow-tailed Hawk, Falco furcatus, Wits. Amer. Orn. r. vi. p. 70. 
Falco furcatus, Bonap. Syn. p. 31. 
Swallow-tailed Hawk, Falco furcatus, AtJU. Orn. Biog. v. i. p. 368. v. v, p. 371. 
GENUS IX. FALCO, Linn. FALCON. 
Bill short, robust ; its upper outline decurved from the 
base ; cere short, bare ; edge of upper mandible with a 
festoon and a prominent angular process. Nostrils round, 
with an internal ridge, ending in a central tubercle. Feet 
strong ; tarsi moderate, reticulate ; toes long, broadly scu- 
tellate, the anterior webbed at the base ; claws long, well 
curved, very acute. Wings long, pointed ; second quill 
longest, first and third nearly equal ; outer toe abruptly cut 
out on the inner web. Tail rather long, nearly even. 
19. 1. Falco Islandicus, Lath. Iceland or Jer Falcon — 
Gyr Falcon. Labrador Falcon. 
Plate CCCLXVI. Adult Female. Plate CXCVI. Young Male and Fe- 
male. 
Tooth-like process of the bill generally obsolete in old, festoon 
slight in young birds ; tail from three to four inches longer than the 
wings. Adult white, with slate-grey sagittate spots above, the bill 
pale blue, the cere and feet yellow. Younger birds light grey, the 
feathers white on the edges ; the bill and cere light blue, the feet 
greyish-blue. Young brownish-grey above, the feathers margined 
and spotted with reddish-white, the lower parts yellowish-white, 
longitudinally streaked with dusky. 
Male, 22\, 49. Female, 28i, 511. 
Breeds in the extreme north, and in Labrador, in winter, migrates 
southward as far as Maine. 
Falco Islandicus, Jer Falcon, Rich. & Swains. F. Bor. Amer. v. ii. p, 27. 
Gyr Falcon, Falco Islandicus, Nctt. Man. v. i. p. 51. 
Iceland or Jer Falcon, Falco Islandicus, Aud. Orn, Biog. v. iv. p. 466. Adult 
Female. 
Iceland or Jer Falcon, Falco Islandicus, Aud. Orn. Biog. v. ii. p. 552. Touug 
Male and Female. • 
