Family CYPSELUS

Bill small, hooked at the end, gape very broad. Wings long, the primaries greatly developed, curved; secondaries very short. Humerus very short. Feet weak, the first or hind toe is more or less reversible, and all four toes are often directed forward in some of the genera.

This family is cosmopolitan, except that it does not occur in Arctic or Antarctic regions. There are three subfamilies, thus distinguished :—

a. Tarsus feathered ; three anterior toes (2, 3,4), each with three phalanges ; wings extending far beyond tail ……………….Cypselinae, p. 163.
b. Tarsus generally naked; second toe with 3, third with 4, fourth with 5 phalanges as usual. a1. Tarsus equal to middle toe or longer; wings extending far beyond tail……………….Chaeturinae, p. 172.
b1. Tarsus shorter than middle toe ; wings not extending beyond tail……………….Macropteryginae, [p. 179.

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 CYPSELUS
Book Author: 
William Thomas Blanford
Year: 
1895
Page No: 
163
M_ID: 
7431
M_SN: 
Apodidae
Volume: 
Vol. 3
Term name: 
id: 
1485

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