XXIV 
ON THE GENERA. 
B". Maxilla dentate, pectore setis hand ornato. 
a. Majores, robustiores, rostro flavescente, valde dentato. 
a!. Gutture coccineo, pectore nigro 
b 1 . Gutture pectoreque coccineis 
c'. Gutture pectoreque nigris 
d'. Fronte rubra, pectore brunneo 
b. Minores, rostro nigro. 
a 1 . Capite toto albo 
b'. Capite guttureque coccineis. 
a!'. Supra niger 
b". Supra terricolor, sulphureo lavatus 
c'. Pectore albescente, coccineo variegato 
d’. Pectore flavescente, brunneo maculato 
e'. Supra niger, sulpbureo variegatus. 
a". Fronte rubra. 
a" 1 . Gutture nigro 
b'". Gutture albo 
b". Fronte nigra, superciliari albo 
P. dubius. 
P. bidentatus. 
P. rolleti. 
P. melanopterus. 
P. leucocephalus. 
P. abyssinicus. 
P. torquatus. 
P. vieilloti. 
P. undatus. 
P. leucomelas. 
P. diadematus. 
P. melanocephalus. 
3. Genus Tetragonops. 
Characteristics . — The tip of the lower mandible is deeply bifurcated, and the apex of the 
upper fits into the division ; the bill is very powerful, and in T. ramphastinus almost square 
at the base, the culmen being perfectly flat ; the nostrils, which are round and basal, are 
situated in two grooves. Sir William Jardine, in first describing this species, mentions that 
the bill is richly coloured, the apical half being bluish black and the rest rich yellow and 
orange ; this, with the abnormally coloured loose plumage, gives the bird the appearance of 
a small Toucan. The only other known species has the bill rather modified in form ; but 
the upper mandible is also furnished with two teeth near the tip ; it is not so brilliantly 
coloured. Both have a shining occipital crest, and are larger than the other American 
Capitonidce ; but little is known of them yet, as they are very rare birds. 
B'. Mandibulse apice bifurcato. 
a. Gutture cineraceo T. ramphastinus. 
b. Gutture olivaceo T. frantzii. 
B. MEGALvEMINiE. 
This subfamily is separated from the first one by its smooth upper mandible, and from 
the third by the form of the bill and the rictal bristles. The bill is as long as or longer 
than the head, much inflated at the base, being as broad as it is high ; the culmen is raised 
between the nostrils. The upper mandible slopes slightly towards the tip, the anterior half 
of the gonys inclines upwards, giving to some species the appearance of having the bill 
turned upside down. The bill is compressed towards the tip ; the bristles are long, coarse, 
and black ; the nostrils rounded and basal. The wings are moderate in length and rounded, 
not adapted for long flights ; the first primary is very short, the fourth, fifth, and sixth are 
