THE GYR-KALCONS. 
195 
Falco is/amius {>iec Gm.), Newton, ed. Yarr. Bnt. B. 1. p. 46 
(1871); Dresser, B. Eur. vi. p. 25, pis. 37o> S/J 
Saunders, Man. Br. B. i. p. 333 (1889); Lilford, Col. 
Fig. Br. B. part xxix. (1894). , /q„\. 
Hierofalcoislandus, Sharpe, Cat. B. Bnt. Mus. 1. p. 414 (1874) j 
k O. U. List Br. B. p. 102 (1883). 00 x 
Falco gyrfako-candicatts, Seebohm, Brit. B. 1. p. 10 (1883). 
Adult Male. — Entire head white, with blackish shaft-streaks, 
very narrow on the forehead and broader on the nape, with a 
slight greyish shade under the eye and over the ear-coverts ; 
upper surface of body greyish-brown, clearer on the rump, all 
the feathers tipped and barred across with white, these bars 
sometimes not continuous; quills dark brown, with narrow 
white tips, the feathers barred on the inner web but notched 
and freckled on the outer web with white ; tail ashy, with a 
S alternately barred with bl.tckisir, the ntermedtale 
spaces being ashy-white, sometimes freckled with bkckish , 
under surface of body white, the throat almost unspotted the 
chest covered with central streaks developing into tear-drop 
spots at the end ; rest of under surface of body spotted with 
blackish, taking the form of bars on the sides of the bod^ 
under tail-coverts, and flanks, being rather numerous and 
close-set on the latter ; under wing-coverts white, spotted or 
half-barred with blackish ; bill pale horn-blue, yellow at base 
of lower mandible ; cere, orbits, and feet yellow ; ins dark 
brown. Total length, 22 inches; culmen, 1-4 wing, 140, 
tail, 9-0 ; tarsus, 2-3. 
Adult romale. — Similar to the male, but larger. Total length, 
24 inches; culmen, 1-4; wing, i6-o; tail, 9'oi tarsus, 2-4. 
Youug Bird9.-Brown; all the feathers of the upper surface 
being margined with whitish, with conspicuous ojal sp°ts of 
white on the upper tail-coverts ; tail brown, with broad band 
of whitish ; head whitish, the feathers streaked with dark brow n 
down the centre, the hind-neck more conspicuously mottlea , 
under surface white, the throat unspotted; all the rest ot tnc 
feathers conspicuously centred with brown, these markings 
somewhat oval in form, excepting on the flanks, where tney 
are irregular, the brown occupying the greater portion ot tne 
feather ; cere, orbits, and feet bluish-grey. 
O 2 
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