Recently proposed for species-rank separation from S. olivascens (and in fact most closely related to S. lebruni)#R on basis of its (in breeding male) brighter yellow plumage (1); no olive tinge to breast (1); (in both sexes) unmarked vs streaked or mottled back (1); smaller size (on published data#R effect size for bill –3.46, score 2); lower-elevation arid-shrubland habitat (600–2100 vs 2250–4500 m; 1); and (“strikingly” different) song, a rhythmic, harsh, metallic and fast-rolling series of ascending and descending syllables with much mimicry, vs several rapidly consecutive series each consisting of 3–4 rapid, harsh, dry trilled notes, entire phrase typically ending with a distinctive final note (allow 3). Monotypic.
W Argentina from NE Catamarca S to C Mendoza and NW San Luis#R.
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