8 CLASSIFICATION OF BIRDS, 
Suborder 6. TROGONES. 
The Trogons have the second digit reversed. The front plantar splits into two to lead to 
the two front toes, and the hind plantar does the same to lead to the two hind toes. Hither 
of these characters is diagnostic. The combination of the following characters is also 
diagnostic :— 
s 
A. Palate schizognathous. B. Basipterygoid processes present. ©. Spinal feather-tract 
well defined from nape to oil-gland, and not forked. D. Young born helpless and 
not passing through a downy stage. 










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This is the first appearance of basipterygoid processes, which we may assume to have once 
been universal, inasmuch as they are found in the embryos of many Passeres. 
The presence or absence of basipterygoid processes on the basisphenoid, or upon its 
rostrum, which articulate with facets on the pterygoids, is a character of great value in the 
diagnosis of many groups of birds; but the following suborders contain species in which 
basipterygoid processes are present, as well as others in which they are absent :—Coracie, 
Tubinares, Gralle, and Fulicarie. 
a 
