76. HIEROFALCO. 415 



where they are irregular, the browu occupying the greater portion 

 of the feather ; cere, orbits, and feet bhiish grey. 

 Hah. Iceland, migrating into North-western Europe, 



a. Ad. St. Iceland. Purchased. 



b. Juv. St. Iceland. Purchased. 



c. 2 ad. sk. Iceland. J. Gould, Esq. 



d. S ad. sk. Iceland {Proc'or). J. Gould, Esq. 



e. S juv. sk. Iceland (Proctor). J. Gould, Esq. 



/ 2 i^^- St. Eeikjavik, Iceland. Professor A. Newton [P.l 



ff. 2 ad. St. Great Britain. 



h. Skeleton. Zoological Society. 



3. Hierofalco holboelli. (Plate XIII.) 



Falco arcticus (nee Gm.), Holhoell, Zeitschr. ges. Natimc. iii. p. 426 

 (1854) ; Blmius, Naumannia, 1857, p. 238 {id. Nachtr. Natmi. Voa 

 Deutschl. p. 19 (1860, nee Taf. 390. fig. 2). 



Iceland Falcou (light variety), Salvin 8,^£rodr. Falconry, p. 87, pi. x. 

 (1855). ^' ^ ' ^ 



Falco gyrfalco grojnlandicus, Schl. Mus. P.-B. Falcones, p. 13 ri855) 

 Falco holboelli, Sharpe, P. Z. S. 1873, p. 415. 



Adult male. Head white, with blackish shaft-stripes, a little 

 broader on the nape ; rest of upper surface greyish brown, with more 

 or less of a bluish shade according to the light, transversely banded 

 and tipped with white ; quills brown, edged and tipped with white 

 and freckled on the outer webs ; on the smaller secondaries are 

 indistinct bands of browu, alternating with bars of greyish white, 

 the latter plentifully freckled with brown ; tail ashy grey, tipped with 

 white, plentifully freckled with brown and showing transverse cross 

 bars on the outer feathers ; under surface white, the throat and chest 

 entirely unspotted, the rest of the body sparingly spotted with blackish, 

 taking the form of bars on the flanks, thighs, and under tail-coverts ; 

 under wing-coverts white, spotted with black ; inner face of wing 

 whitish, barred with black ; cere and orbits yellow ; bill bluish, 

 yellow at base of lower mandible ; feet yellow ; iris dark. Total 

 length 19 inches, eulmen 1-3, wing 14, tail 7-5, tarsus 2-1. 



Adult female. Similar to the male, but larger, and having the tail 

 regularly barred across as in adult If. islandus. Total length 20 

 inches, eulmen 1 -4, wing 15, tail 5-5, tarsus 2-2. 



Young male. Above brown, shaded with ashy, all the feathers 

 margined with ashy white ; quills ashy brown, the secondaries with 

 distinct whitish margins, much narrower on the primaries ; all the 

 primaries notched with buffy white on the inner web, dissolving on 

 the inner ones and absent on the secondaries ; lower back, rump, 

 and upper tail-coverts ashy brown, the margins on the two former 

 slightly rufescent, on the latter white, some of the outermost upper 

 tail-coverts notched with white; tail brown, shaded with ashy, 

 tipped and barred (not across) with fulvous, these bars about thir- 

 teen in number and often obscured by greyish mottliugs ; head 

 ashy brown, with pale greyish margins ; forehead whitish ;' nape 

 much mottled with white ; ear-coverts whitish, streaked with brown 



