Species.
A. No rufous on tail-feathers; tail forked or emarginated.
a. Lateral tail-feather as broad as the others; tail emarginated. Rump and middle tail-feathers blue.
C. helenæ. Very small (wing, 1.15); metallic hood and ruff of the male purplish-red. Hab. Cuba.
b. Lateral tail-feather abruptly narrower than the others, tail forked. Rump and middle tail-feathers green.
C. anna. Large (wing, 2.00); outer tail-feather with a double curve, the end inclining outward. Metallic hood and ruff of the male purplish-red. Hab. California.
C. costæ. Small (wing, 1.75); outer tail-feather with a simple curve, the end inclining inward. Metallic hood and ruff of the male violet-blue. Hab. Southern California, Arizona, and Mexico.
B. Inner webs of tail-feathers mostly rufous, and outer webs edged with the same. Tail rounded. Lateral tail-feather abruptly narrower than the others.
C. floresi.[115] Size of C. anna. Hood and ruff of the male crimson. Hab. Table-lands of Mexico (Bolanos).