Genus — T Y T 0 . 
Tyto Billberg, Synops. Faunae Scand., Vol. I., pars ii., 
tab. A, 1828 . . . . . . . . . . l^pe T. alba, 
Ulula Nitzsch, Observ. Av. Art. Caret Comm., p. 20, 
1829. (New name for Strix auct., ex Savigny. 
Not Ulula Cuvier 1817) . . . . . . . . Type T. alba, 
Flammea Fournel, Fauna de la Moselle, p. 101, 1836 Type T, alba, 
Hybris Nitzsch, Pterylographie, pp. 27-100, 1840 . . Type T, alba, 
Eustrinx Webb and Berth elot. Hist. He Canaries, 
Zool., p. 8, 1841 . . . . . . . . . . T^pe T, alba, 
Stridula Selys-Longchamps, Faun. Belg., p. 60, 1842 Type T, alba, 
Glaux Blyth, Journ. As. Soc. Bengal, Vol. XIX., 
p. 513, 1850 . . . . . . . . . . Type T, longimembris, 
Scelostrix Kaup, Contr. Orn. (Jardine) 1852, p. 119 Type T. longimembris, 
Dactylostrix Kaup, Contr. Orn. (Jardine) 1852, p. 119 Type T, n. castanops, 
Strix Savigny, Descr. Egypt. Hist. Nat., Vol. I., 
pp. 69-113, 1809. (Not Strix Linne 1758.) 
Aluco Fleming, Philos. Zool., Vol. II., p. 236, 1822. 
(Not Aluco Link 1807.) 
? GlypTiidiura Reichenbach, Av. Syst. Nat., pi. xcn., 
1850. 
Strigymnhemipus, Des Murs. Encycl. d’Hist. Nat. 
(Chenu) Ois., Vol. I., p. 146, 1854. . . . . . Type T. a, tuidara. 
Glaucostrix “ Bp. 1854 ” Gray, Cat. Gen. Subg. Birds, 
p. 135, 1855. 
The Barn Owls have been separated from the rest of the Owls with the rank 
of a Family on account of the difference in the pterylosis of the nestling, 
which is accompanied by differences in their osteology. Superficially, there 
are no great visible differences, which prove that osteological characters cao 
differ without revealing themselves superficially. 
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