Subfamily ASIONINAE

Ear-orifice large, exceeding the eye in size, lunate or ovoid in shape, and furnished with an operculum. Facial disk well-marked and nearly as high above the eyes as below them; ruff distinct.

The Owls of this subfamily are of moderate or large size, with feathered tarsi. Two genera are Indian.

Key to the Genera.

a. Aigrettes present: 2nd quill longest; iris yellow……………………….Asio, p. 270.
b. No aigrettes: 3rd, 4th, or 5th quill longest; iris dark………………………SYRNIUM, p. 273.

BookTitle: 
The Fauna Of British India including Ceylon and Burma
Reference: 
Blanford, William Thomas, ed. The Fauna of British India: Including Ceylon and Burma. Vol.3 1895.
Title in Book: 
Subfamily ASIONINAE
Book Author: 
William Thomas Blanford
Year: 
1895
Page No: 
270
Volume: 
Vol. 3
id: 
1622

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