Arremon dorbignii Sclater, 1856

Buainain, Nelson, Brito, Guilherme Renzo Rocha, Firme, Daniel Honorato, Figueira, Daniel Monteiro, Raposo, Marcos A. & Assis, Claydson Pinto De, 2016, Taxonomic revision of Saffron-billed Sparrow Arremon flavirostris Swainson, 1838 (Aves: Passerellidae) with comments on its holotype and type locality, Zootaxa 4178 (4), pp. 547-567 : 562-563

Arremon dorbignii Sclater, 1856

Arremon flavirostris d’orbignii Sclater, 1856 ( Hartert & Venturi 1909: pp. 172)

Holotype. MNHNP7026 (Museu National d’Histoire Naturelle, Paris), adult male, Yungas.

Type locality. Province Yungas , Bolivia (original designation).

Plumage diagnosis. Differs from A. flavirostris and A. polionotus by having long white superciliary stripes starting right after bill instead of above eye; full Medium Neutral Gray (Color 84 in Smithe 1975) crown stripe always present even in adult male. Also differs from A. polionotus by having Yellowish Olive-Green (50) dorsal regions (including scapulars) instead of Gray (varies between 78/79/84) and from A. flavirostris by less extensive Yellowish Olive-Green (50) on borders of Sepia (119) rectrices.

Description. Conical bill; mandible Orange Yellow (18); maxilla Orange Yellow (18) with black ridge starting at base of bill at level of nares, becoming thinner as it reaches tip; black head and auriculars; Medium Neutral Gray (84) crown stripe on middle of head, from bill insertion to nape; bold white superciliary stripes starting above the eye reach sides of nape; nape Medium Neutral Gray (84); rest of dorsal regions (including scapulars), wing- and tail-coverts Yellowish Olive-Green (50); edge of marginal wing coverts Spectrum Yellow (55); remiges and rectrices Sepia (119) with Yellowish Olive-Green (50) on webs from border nearly to the rachis, especially on inner primaries and the secondaries, rectrices Sepia (119) with Yellowish Olive-Green (50) close to base; presence of very subtle Turquoise-Green (64) with Light Neutral Gray (85) on edges of rectrices; white ventral regions (chin, chest, breast and abdomen), contrasting with black pectoral band; Light Neutral Gray (85) sides and flanks; thighs white with Glaucous (79).

Sexual dimorphism. Females differ slightly from males by tending to have all plumage only slightly tinged Buff (24), more evident on throat and breast, but also on crown stripe and dorsal regions resulting in brownish tone over Yellowish Olive-Green (50). However, some adult males also have some buff in plumage and some females can have pure white ventral regions, which make it difficult or even impossible to distinguish the sexes without direct comparison.

Immatures. No specimens analyzed.

Measurements. (n: m = 65 / f = 31). Mean values in mm, male (m), female (f). Bill length = 16.38 (m), 16.18 (f); Bill width = 6.95 (m), 6.83 (f); Bill height = 7.49 (m), 7.33 (f); Wing length = 72.94 (m), 69.51 (f); Tail length = 62.43 (m), 59.49 (f).

Distribution. Western Bolivia and northwestern Argentina in Andes.