MONOGRAPH OF THE OWLS—STRIGID4, 
This review however, like all human works, very much requires 
correction. 
THE LAWS FOR SYSTEMATISING THE TEN GENERA OF OWLS. 
Wuen we consider the ten genera of Strigidew, we cannot find 
more than two subfamilies—Day Owls and Night Owls. 
The Day Owls—Surnine, have some analogies in their whole 
exterior form with the Falconine of the Falconide, Eye, Nerve and 
Head-Birds, and must be placed at the head of the whole family. 
The Night Owls— Strigine, as the true representants of the 
second family of Strigidw, are the second subfamily, because they 
manifest, in a very clear way, the Ear, Respiration and Breast- 
Birds. 
The classification of the Owls with and without ear-feathers is 
too superficial to require refutation. To classify them according to 
the form of the ears can give only an artificial system, because we 
find both small and large earholes in the Surnine as well as in the 
Strigine. When we classify the Owls in a true natural way, we 
must proceed as follows :— 
The Owls as a family are the true representants of the class of 
birds in their suborder Rapaces, which consists of the families — 
(1.) Falconide, (2.) Strigide, (3.) Gypogeranide, (4.) Gypaétide 
and Vulturide. 
The Day Owls — Surnine, like the Falconine of the Faleonide, 
are the manifestations of the eye, nerve, and head, and must 
therefore have as a subfamily the first rank. 
The Night Owls — Strigine are the representants of the ear, 
respiration, and breast, and must have therefore as a subfamily the 
second rank. In the second subfamily Strigin of the second family 
Strigide, we must find out the true representant of the whole sub- 
family and family. If we look which genus among the Strigine 
has the most completely developed ear with a complete operculum ; 
which has the bird character, the longest wings, the largest breast 
and a very inconsiderable weight, we shall find there is no other 
genus than Otus. 
Orus is therefore the second genus in the subfamily, and tt 0 the 
type-genus of the whole family Strigide. 
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