Throat-feathers elongated laterally into a kind of ruff. Tail-feathers edged or banded with cinnamon at base.
Tail cuneate, the outer primary attenuated at end. Innermost tail-feather green above.
Tail dusky at end … Selasphorus.
Tail tipped with white … Atthis.
Tail nearly even, and emarginated. Outer primary not attenuated at end. Innermost tail-feather brown above … Stellula.
B. Top of head metallic red or violet.
Metallic feathers of side of throat much elongated … Calypte.
II. Bill bare of feathers between the nostrils.
C. Top of head bluish-black; a white line through eye.
Metallic feathers of side of throat not elongated.