ON THE CLASSIFICATION OF BIRDS. 
306 
moved from the culmen. Versatile toe always longer 
than the anterior.* {Jig. 275.) 
Piciis, Sw. Lateral ridge situated nearer to the edge 
than to the culmen. Bill with the sides compressed. 
Neck long, and thin. Versatile toe considerably 
lengthened America and India. 
P. robustus. Spix, pi. 44. principalis. Wilson, 29. f. 1. 
Hemicircus, Sw. Tail excessively short, and very broad. 
Neck short, very slender. Bill straight, considerably 
compressed. Lateral ridge slight, near to the margin. 
Nostrils concealed. Feet very large. Versatile toe 
always longer than the anterior. Wings nearly as 
long as the tail. India. 
II. coiieretus. PI. Col. 90. 
Dendrohates, Sw. Lateral ridge close to the margin. 
Sides of the bill much compressed ; the base wide. 
Versatile toe usually longer than the anterior. Plum- 
age, olive above, generally spotted or banded. Africa 
only *, excepting two species from Tropical America. 
D. fulviscapus. Ois. d’Af. pi. 259. 
ApternuH, Sw. Lateral 
ridges close to the 
margin. Bill rather 
broader than high. 
Feet three-toed ; the 
two anterior nearly 
equal, the posterior 
much longer. Arctic 
regions, {jig. 276.) 
A. Americanus. N. Zool. pi. 56.f areticus. N. Z. pi. 57. 
* I use these terms for the sake of brevity : the versatile toe is the outer 
posterior toe, and the anterior is the outer fore toe, corresponding to the 
middle one of ordinary peckers. 
+ It being now ascertmned that this is a distinct species from the Euro- 
pean iridactylus^ another name is necessary to designate it. 
