I think you should examine the photos from the VIREO collection at
seem to support Turner & Rose.
> Degree of forking/notching of the tail has been cited as a character that is
> useful for distinguishing Mangrove and White-rumped swallows. Apparently
> this notion is based on the illustration of White-rumped in Turner and Rose
> (1989; Swallows and martins), where it is shown with a deeply forked tail.
> The text descriptions in that book, however, describe both White-rumped and
> Mangrove as having "slightly forked" tails. Ridgely and Tudor (1989; Birds
> of South America. Vol. 1, oscine passerines) do not mention the tail of
> White-rumped being different those of other *Tachycineta*, and it is
> illustrated as being only modestly forked. Narosky and Yzurieta (1989;
> Birds of Argentina and Uruguay) say of *Tachycineta*, including
> White-rumped, "tails barely forked," and their illustration matches that
> description. Finally, the photo of White-rumped in Dunning (1987; South
> American birds: a photographic guide) shows very little (if any) notching of
> the tail. Also notable in this photo are the tertials, which show only a
> slight hint of white tips.
> Degree of tail forking thus does not appear to differ significantly between
> the two species.
> David Wright
> Miami Shores
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