284 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



which its greatest depth is equal to one-half the exposed culmen); 

 frontal feathering variable in its anterior extension, the antia scarcely 

 or but little anterior to basal end of nasal operculum, and nearly- 

 opposite the malar antia, in C. rufina, nearly at its anterior end in 

 C.flavirostris, of intermediate position in other species. Wing rather 

 large, pointed, the longest primaries exceeding distal scondaries by at 

 least one-third the length of wing; second, or second and third, pri- 

 maries (from outside) longest, the first sometimes longer than third, 

 sometimes shorter than fourth; none of primaries with inner web 

 distinctly sinuated (the two outermost slightly sinuated in C.flaviros- 

 tris and G. rufina). Tail one-half to a little more than two-thirds as 

 long as wing, distinctly but never strongly rounded, the rectrices 

 moderately rounded, with broadly rounded tips, moderately rigid. 

 Tarsus slightly to decidedly shorter than middle toe without claw (the 

 proportion of the latter to the former varying from 1.01 to 1 in 0. 

 araucana to 1.23 to 1 in 0. inornata), the acrotarsium with very dis- 

 tinct broad transverse (sometimes partly hexagonal) scutella, the 

 planta tarsi with more or less distinct very small roundish scales (ex- 

 cept in 0. rufina ?), the upper portion always feathered (except behind) 

 for greater or less distance below tibio-tarsal joint (upper half feath- 

 ered in C. araucana, less than upper third feathered in C.flavirostris); 

 toes rather stout, with moderately broad, minutely papillose tylari, 

 the lateral toes about equal in length, with claws falling very slightly 

 short of base of middle claw; hallux stout, broader than lateral toes, 

 longer than basal phalanx of middle toe. 



Plumage and coloration. — Plumage in general dense, that of head, 

 neck, and under parts blended, that of the hindneck, however, scale- 

 like and metallic in the type-species and its nearest allies; bare 

 circumorbital area rather contracted. Coloration plain, bluish gray 

 and olive or grayish brown prevailing on upper parts, the head, neck 

 and anterior under parts more or less vinaceous; hindneck sometimes 

 metallic bronze or greenish, but never with bars or squamations, the 

 type and allied species, however, with a single white or whitish bar 

 across nape; in most species, the tail with a more or less distinct 

 darker band across middle portion, or with apical half abruptly paler 

 gray than basal portion; sexes alike or only slightly different in color. 



Range. — Temperate and tropical South and Central America, 

 western temperate North America, and Greater Antilles (Cuba, Haiti, 

 Jamaica, and Porto Rico). (About seven species, not counting 

 subspecies.) 



It is possible that this genus requires subdivision, since some of 

 the species herein included are decidedly aberrant. C. flavirostris 

 differs conspicuously from all the others in its very thick and rela- 

 tively short bill, with the frontal feathering advancing nearly to the 

 anterior end of the nostrils, and the feet, especially the tarsi, are also 



