310 ON THE OLASSIFICATION OF BIRDS. 
but with a faint lateral ridge close to the basal 
of the culmen. Tip of the upper mandible wide and 
depressed. Wings very short. Tarsus, anterior and 
versatile toes, all of the same length. Africa only. 
G. terrestris. Burchell. Ois. d’Af. pl. 264. 
Colaptes. Bill considerably compressed. Culmen arched ' 
from the base. Lateral ridge entirely wanting. Tarsus © 
longer than the versatile toe. Wings long. (fig.277.-b,e) — 
C. auratus. Wils. pl. 3. f. 1. Mexicanus. N. Zool. ii. $15- 
Menanerpes, Sw. Bill straight, more or less cylindri-— 
cal: base wide: the ridge of the culmen slightly bent, 
but not very prominent: the sides rounded ; the la- 
teral ridge slight, and placed near, but not close to, 
the culmen. Gonys very long, as in the typical 
group. Nostrils nearly concealed. Wings long; the 
first quill spurious, or very small; the second nearly 
as long as the third. Toes various. Habits gregari- 
ous and migratory. Colours black, varied with white 
and red. The fissirostral type. America only. 
Centurus, Sw. Gonys angulated, half as long as the 
under mandible. Lateral ridge about half the length 
of the culmen, which is gently curved. Sides of the 
bill compressed. Tarsus shorter than the versatile 
toe ; the anterior rather longer. Plumage, above, black 
banded with white. (fig. 277. c) 
C. Carolinensis. Wils. 7. f. 2. brachypterus. Sw. sp. nov. 
Leuconerpes, Sw. Bill as in Melanerpes. ._The base 
wide, but the sides much compressed. Lateral ridge 
placed half way between the culmen and the margin. 
Wings long. Versatile toe shorter than the anterior. 
Tarsus shorter than either. : 
L. candidus. Zool. Ill. i. pl. 38. 
Melanerpes, Sw. Bill straight, the base wide; the 
sides not compressed. Gonys long, and equally cury-_ 
ing to the tip with the culmen. Versatile and ante- 
rior toes equal. Tarsus much shorter. Wings long, 
reaching almost to the end of the tail. 
M. erythrocephalus. Wils. 9. f.1.  torquatus. Ib. 20. f. 3. . 
oe 
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