258 
ON THE CtASSIFICATION OF BIKDS. 
the base. Culmen depressed jts whole length j tip 
abruptly hooked. Feet pale. 
M. regius. Braz. Birds, ii. pi. 51, 52. 
Tonus. (Jig. 228.) Feet very weak. Tarsi lengthened, 
slender, considerably longer than the hind toe and 
claw. Anterior toes short ; lateral toes unequal, more 
or less united at their base. Bill broad, typically 
lengthened, boat-shaped, thin, contracting suddenly 
at the tip, which is gradually hooked. Wings and 
tail very short, rounded ; the latter very slender. 
The following appear to be subgeneric types. 
Conopophaga, Vieil. (Jig. 228. a) Head very large. 
Tail excessively short. Bill short, gradually narrow- 
ing to the tip. Gonys ascending : front with setaceous 
plumes, but without bristles. Feet and toes long and 
slender ; the inner shortest ; the outer united as far 
as the first joint. 
C. ruficcps. B. B. ii. pi. 72. collai'is. B. B. ii. pi. 74. 
Platgrhynchus, Desm. (fig. 228. 6) Bill very short, 
broad, and weak; the sides dilated: under mandible 
very weak and flat. Bristles at the gape longer than 
the bill. Tail and wings as in Conopophaga. Feet 
small. Tarsi and toes very slender ; the latter short 
and syndaetyle ; lateral toes unequal. 
Todus, Lin. (fig. 228. c) Bill lengthened, broad 
throughout, contracting suddenly at the tip, very 
fiat. Bristles short, weak, or none. Tail short, very 
slender, rounded. Legs long, weak. Toes short ; the 
