BIRDS OF NORTH AND MIDDLE AMERICA, 481 
or sulcus. Nasal operculum moderately broad and convex, unfeath- 
ered, but mostly concealed by overhanging frontal feathers, which 
extend anteriorly beyond anterior end of nostrils, forming a more or 
less prominent point or antia on each side of the mesorhinium. 
Tarsus clothed with short feathers; middle and inner toes about equal 
in length, the outer slightly shorter, the hallux shorter than outer 
toe; feet relatively very small. Wing more than three times (some- 
times four times) as long as exposed culmen, the outermost primary 
longest. Tail nearly to quite two-thirds as long as wing, emarginate, 
the rectrices broad, with broadly rounded tip. 
Coloration.— Above metallic green or (in one species only) grayish 
brown or olive, the tail metallic green or blue, or (Gn @. delphine) 
‘olive, crossed by a subterminal band of darker green, blue, blackish, 
or bronze-dusky; a conspicuous post-auricular tuft of violet, violet- 
blue, or (Gin ©. serrirostris) violet-red broad, rounded and imbricated 
feathers; under parts mostly metallic green, this broken by darker 
centers to the strongly individualized feathers (producing an effect 
quite peculiar to the genus), sometimes relieved by a violet or violet- 
blue pectoral or jugular area, the chin and suborbital region also 
sometimes violet or violet-blue; in C. delphine the under parts brown- 
ish (more or less spotted or mottled), the throat with metallic green, 
bluish, or bronzy feathers, the tail-coverts broadly margined with 
light cinnamon. Sexes alike in coloration, but females usually 
decidedly smaller than males. 
Range.—Southern Mexico to Guiana, southern Brazil, Bolivia, and 
Peru. (Nine species.) 
KEY TO THE SPECIES OF COLIBRI. 
a. General color metallic green. 
b. A patch of violet-blue on center of chest or breast. 
c. Larger (wing 70-84.5, tail 45-55, culmen 23-28.5); whole chin blue. (Colom- 
_bia to Venezuela, Bolivia, and Peru.)......-.- Colibri iolotus (extralimital).¢ 
ce. Smaller (wing 60-70, tail 35.5-45, culmen 18-22); chin wholly green or with 
only extreme upper margin blue. (Guatemala and southern Mexico.) 
Colibri thalassinus (p. 482). 
bb. No blue on under parts. (Costa Rica to Venezuela, Bolivia, and Ecuador.) 
Colibri cyanotus (p. 484). 
aa. General color grayish brown or olive, the upper tail-coverts (in young other upper 
parts) margined terminally with cinnamon, rusty, or buffy. (Guatemala to 
Peru, Trinidad and Guiana.).................------ Colibri delphing: (p. 486). 
@ Rhamphodon anais (nbt Ornismya anais Lesson, 1830) Lesson, Hist. Nat. Troch., 
1832, 146, pl. 55.—Petasophora anais Gould, Proc. Zool. Soc. Lond., 1847, 8; Mon. 
Troch., pt. iv, 1853, pl. 224; Introd. Troch., oct. ed., 1861, 124; Elliot, Classif. and 
Synop. Troch., 1879, 50.—Petasophora iolota Gould, Proc. Zool. Soc. Lond., 1847, 9 
(Bolivia).—Fetasophora tolata Gould, Mon. Troch., pt. iv, 1853, pl. 225; Introd. 
Troch., oct. ed., 1861, 124; Salvin, Cat. Birds Brit. Mus., xvi, 1892, 107.—C[olibr?] 
tolotus Hartert, Das Tierreich, Troch., 1900, 94 (monogr.). 
This species undoubtedly requires subdivision into two or more subspecies. 
81255°—Bull. 50—11——31 
