Plumages, Molts, and Structure

The following description refers to nominate rufocinerea; see also Geographic Variation:

Adult: Sexes similar. Adult Bicolored Antpittas are simply-plumaged and easily described. The head, throat, upperparts, wings, and tail are nearly uniform rufous-brown or ferruginous red. The throat feathers are somewhat variable, but are very slightly more rufous than the upperparts and have gray bases giving an indistinct mottled or speckled appearance. The underparts vary from gray to sooty gray, with the central belly tending towards whitish. Gray feathers of the breast, sides, and flanks narrowly edged whitish, giving a slightly scaled appearance, especially in certain light conditions.

Undescribed.

Iris: dark brown

Bill: black

Tarsi and toes: gray to brownish gray

Total length: 15-16 cm (Restall et al. 2006), 15.2 cm (6 inches; Sclater 1890), 15.5 cm (Fjeldså and Krabbe 1990), 15.5-16 cm (Ridgely and Tudor 2009), 16.5 cm (Hilty and Brown 1986, Stattersfield and Capper 2000), 17.8 cm (7 inches; Meyer de Schauensee 1970).

Linear measurements:

male: wing (chord) 89.6 mm, wing (flat) 95.0 mm, tail 50.5 mm, culmen from base 23.0 mm, exposed culmen 18.6 mm, bill from nares 13.8 mm, tarsus 45.3 mm (n = 1, holotype of romeroana, Hernández and Rodríguez 1979)

sex unspecified:

wing 86.4 mm (3.4 inches), tail 45.7 mm (1.8 inches), tarsus 43.2 mm (1.7 inches) (n = 1, holotype of rufocinerea, Sclater and Salvin 1879); wing (chord) 83.0 mm, wing (flat) wing 87.0 mm, tail 46.0 mm, bill from nares 12.0 mm, tarsus 40.7 mm (n = 1, holotype of rufocinerea, Hernández and Rodríguez 1979)

wing (chord) 83.2 mm, wing (flat) 86.0 mm, tail 40.0 mm, culmen from base 21.9 mm, exposed culmen 16.5 mm, bill from nares 11.2 mm, tarsus 47.2 mm (n = 1, romeroana, Hernández and Rodríguez 1979)

Mass: 44.8 g (sex unspecified; Krabbe and Schulenberg 2003)