FIGURE 7 in Taxonomic revision of Saffron-billed Sparrow Arremon flavirostris Swainson, 1838 (Aves: Passerellidae) with comments on its holotype and type locality

FIGURE 7. Variations found in the back color of the gray-backed group (A. polionotus). A) Adult specimen with Plumbeous back (AMNH786552) (Argentina, Chaco, Saenz Peña); adult specimens with paler gray tones in the back: B) (AMNH799306) (Argentina, Corrientes) and C) (AMNH32140) (Chapada, Mato Grosso, Brazil); D) immature male specimen with olivaceus tone in the back (AMNH32086) (Chapada, Mato Grosso, Brazil); E) sub-adult male specimen with dark gray back and green feathers mixed in (FMNH295505) (Bolivia, Santa Cruz, Santiago de Chiquitos); F) immature female specimen with buffy olivaceous tone in the back (FMNH296515) (Bolivia, Santa Cruz, Santiago Chiquitos).