#R, Santiago, Chile.
Formerly considered conspecific with T. leucorrhoa (which see). Initially described as Hirundo leucopyga Meyen, 1834, but this name is preoccupied by Hirundo leucopyga Pallas, 1811#R; nomenclatural validity of Pallas’s name has been disputed#R with claims that it is infrasubspecific and merely a descriptive term in the Latin text, but Pallas’s regular use of italics for his taxon names, together with the term “Varietas” which he applied to many of his names that are well entrenched as valid in ornithological literature (e.g. Columba rupestris), indicate that his H. leucopyga is best treated as a valid name, at the same time avoiding risky implications for several other well-established names; in any case, under ICZN Code, Article 45.6.4 (and 188.8.131.52), the name is valid due to its introduction prior to 1961 with the term “Varietas” and no express indication that it is intended as infrasubspecific, and also because before 1985 it was treated as a senior homonym. With validity of Pallas’s name, Meyen’s name becomes preoccupied and is replaced by next oldest name, meyeni. Monotypic.
From C Chile (S from Atacama) and SW Argentina (S from Neuquén and W Río Negro) S to Tierra del Fuego; migrates N as far as C Bolivia, Paraguay and SE Brazil (Rio Grande do Sul).
Food and feeding
Status and conservation
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