

Suborder 12. 
FALCONIFORMES, 
The Owls may be diagnosed as follows :— 
STRIGES. 
A. Young born helpless, but covered with down. 
Spinal feather-tract well defined on the neck. 
B. Oil-gland present, but nude. 
To this diagnosis many other characters may be added :— 
D. Basipterygoid processes present. 
perforans digitorum to second, third, and fourth digits. 












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AReaPeos 
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E |.. >| \*|: 
Cueuli. 
hi 


17 
Cc. 
E. Flewor longus hallucis leading to hallux, fleaor 



















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S [rt GY [od [tt 1D |S [I~ |00 [OD rt (QI OD [St AD [eo I~ [oo AV (C9 ist isd [ce 
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| 
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| 
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| 




A still shorter diagnosis may be made if the muscles of the thigh be allowed to figure as 
characters. 
which only possess the femoro-caudal muscle of the five included in Garrod’s formula. 
The Owls, the Pelicans, the Humming-Birds, and the Swifts are the only birds 
As 
none of them except the Owls possess basipterygoid processes, the diagnosis may be completed 
with only two characters. 
The Owls are further remarkable for haying the basal phalanx of the third digit shortened 
almost to a cube, a condition probably only found elsewhere in the Cypselide, in which 
amily the basipterygoid processes are absent. 
