Aa. Weller et Kl. Schuchmann, Geographical variation in the southern distributional range of the Rufous-tailed Hummingbird, Amazilia tzacatl De la Llave, 1832: a new subspecies from Narino, southwestern Colombia, J ORNITHOL, 140(4), 1999, pp. 457-466
The Rufous-tailed Hummingbird (Amazilia tzacatl De la Llave, 1832), a wides
pread inhabitant of Central America and NW South America, currently compris
es two subspecies (A. t. tzacatl and A. t. jucunda). Another taxon of the s
pecies complex is A. t. handleyi (Wetmore, 1963), initially described as an
allospecies but here regarded only as a subspecies of A. tzacatl. Based on
diverging morphological features, the amount of geographical variation of
A. tzacatl in its South American range suggests the distinction of further
populations. As a taxonomical consequence, we recognize the validity of A.
t. fuscicaudata (Fraser, 1840), and describe a new subspecies, A. t. brehmi
subspec. nov., from Narino, Colombia.