XXX 
ON THE GENERA. 
6. Genus Gymnobucco. 
Characteristics. — Bill with margin smooth ; both mandibles curved in the same degree ; 
culmen acute and inflated at base, but much compressed towards the tip ; a bunch of 
stubby yellowish brown bristles over each nostril, one at each side of the base of the lower 
mandible, and a small one on the chin. Head more or less bare. Wings longer than in 
Megaloema in proportion to its size. Tail rather short. Plumage brown, washed with 
olive-yellow. The exterior front toe, with the claw, is longer than the tarsus, inner hind 
toe moderate. 
This genus was first separated by Bonaparte. There are two species, both from Western 
Africa, one with the head bare, and one with the head feathered, but both very similar in 
colour, and having the same peculiar bristles. The females, strange to say, want the bristles 
over the nostrils ; and in the other places they are feebly developed. According to Verreaux, 
they feed on insects and their larvae, and migrate during the winter. 
There is a third species recorded, G. peli ; but after a careful comparison of the type with 
G. calvus, we came to the conclusion that they were not specifically different. The former 
name, therefore, sinks into a synonym. 
D'. Capite calvo; vel summo plumato; setis densis post nares flavescenti- 
brunneis. 
a. Capite calvo G. calvus. 
b. Capite summo plumato G. bonapartei. 
C. Capitonim:. 
This third and last subfamily, according to our classification, has representatives in all 
three continents. Their distinctive characters are : — the smooth bill, which separates them 
from the Pogonorhynchince ; the rictal bristles (which are few and short, or entirely wanting) 
and the form of the bill (which has a curved tip slightly extending beyond the tip of the 
mandible) : the latter features distinguish them from the Megalcemince. The bill is somewhat 
shorter than the head, rather broader than high at the base ; the culmen is raised between 
the nostrils and compressed towards the tip ; nostrils rounded, basal. Wings rounded and 
of moderate length. (This differs in some of the genera , as also does the length of the tail.) 
The tarsus is of the same length as the exterior front toe. 
We propose to divide them into the following genera : — 
C. Rostro lsevi, setis rictalibus minimis vel deficientibus, et maxilla 
incurva apice ultra mandibulam protenso. 
A'. Cauda longa ; culmiue orbiculato Trachyphonus. 
B'. Caudfi brevi. 
A". Culmine simo Capito. 
B". Culmine acuto compresso Caloramphus. 
C". Culmine acuto inflato Stactolcema. 
