NORWEGIAN JEB-FALGON. 19 
Rapaces — Diurn^e. 
FALCONIDJE. 
Genus — Falco. (Limiceus.) 
Generic Characters. — Head and neck covered with feathers; beak hooked 
and generally curved from its base; cere coloured, more or less hairy at 
its base; nostrils lateral, rounded, or ovoid. Tarsi covered with feathers, 
or with glossy scales. Toes four; external toe often united at its base by 
a membrane to the middle toe; claws pointed, very much hooked, mobile 
and retractile. Vertebrae twelve. 
Sub-genus — Falco. (Bechstein.) 
Sub-generic Characters. — Beak short, and bent from its base; upper man- 
dible with one, rarely two teeth; legs robust; toes strong, long, and armed 
with curved and sharp claws; tarsi short; wings long, first and third quill 
feathers of equal length, second quill feather the longest. 
NORWEGIAN JER-FALCON. 
Falco Gyr -falco. 
Falco Gyr-falco, Schlegel; Revue, 1844. 
" Lanarius, Linnaeus; Faun. Suec, p. 22, No. 62. 
Le Faucon d' Islande, Brisson; i., pi. 31, p. 373. 
Le Gerfaut de Norvege, Buffon; pi. Enl. 462, (young.) Hist. 
Nat. des Oiseaux, i., p. 241, pi. 13, 
(adult.) 
Le Gerfaut, Schlegel et Verster; Traite de 
Fauconnerie, (fig. female Jun., male 
adult.) 
Falco Gyr-falco Norvegicus, Wolley. Bree; in first edition. 
Specific Characters. — Upper half of the tarsi clothed, lower half and toes 
of a greenish yellow; moustache very small; groundwork of plumage bluish 
brown above, white below; spotted on the belly and striped upon the sides 
