Key to Subspecies.
A. Below yellow or yellowish white.
a. Outer tail-feathers merely tipped and narrowly edged with white on the inner
web………….A. t. trochiloides, p. 481.
b. Outer tail-feathers broadly tipped and
edged with white A. t. harterti, p. 481
c. Outer tail-feathers wholly white on inner
web A. t davisoni, p. 482.
B. Below white with an oily-green tinge…….A. t. claudiae, p. 483.