Family ASIONIDAE

Hinder margin of sternum with two deep incisions on each side; furcula free, not attached to the keel of the sternum, imperfect in some genera; a small unforked manubrium (spina externa) is present. Skull broad. Basal and second joints of third (middle) toe subequal in length.

The Asionidae may be divided into 3 subfamilies, thus distinguished :—

a. Facial disk and ruff well-marked.
a1. Ear-orifice smaller than eye; no operculum ; middle claw pectinate…………………………..Photodilinae, p. 268.
b1. Ear-orifice larger than eye and fur¬nished with an operculum; middle claw simple …………………………..Asioninae, p. 270.
b. Facial disk and ruff ill-marked or obsolete; ear-orifice smaller than eye; middle
claw simple…………………………..Buboninae, p. 280.

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: 
Family ASIONIDAE
Book Author: 
William Thomas Blanford
Year: 
1895
Page No: 
267
M_ID: 
6246
M_SN: 
Tytonidae
Volume: 
Vol. 3
Term name: 
id: 
1617

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