Family Typical Antbirds (Thamnophilidae)


Bicolored Antvireo (Dysithamnus occidentalis)


French: Batara occidental German: Anthrazitameisenvogel Spanish: Batarito bicolor

Thamnophilus aethiops occidentalis


, 1923,

Cocal, 4000 ft [c. 1220 m], Cauca, Colombia


Has sometimes been placed in Thamnophilus, and morphological characteristics have connected it with Thamnomanes, but bulk of vocal, morphological and ecological evidence supports its inclusion in current genus. Form punctitectus has been suggested to represent a separate species, but exisiting evidence to support this is both inadequate and, in part, contradictory. Racial identity of birds on Pacific slope of N Ecuador uncertain; tentatively placed in nominate. Two subspecies recognized.

Subspecies and Distribution
  • D. o. occidentalis (Chapman, 1923) – Pacific Andean slope of S Colombia (S Antioquia to Nariño) and extreme N Ecuador (Carchi).
  • D. o. punctitectus Chapman, 1924 – E Andean slope in Ecuador (Napo, Morona-Santiago) and N Peru (Amazonas, San Martín).
  • Descriptive notes

    13·5 cm. Male is blackish-grey, paler below; interscapular patch white, greater and median wing-coverts black, dotted white, lesser coverts (exposed only in display) mostly... read more


    Loudsong uncertain, may consist of one of the following calls. Calls include a brief series of... read more


    Understorey of montane evergreen forest; found at 900–2200 m in Colombia and 1500–2200... read more

    Food and feeding

    Little known. Feeds on insects and other arthropods; identified prey items included small caterpillars and a small adult moth (Lepidoptera... read more


    Very little known. One published record of a nest in Ecuador, with both adults attending single nestling, in Dec: an open cup of black... read more


    Presumed resident.

    Status and conservation

    VULNERABLE. Restricted-range species: present in Chocó EBA and Ecuador-Peru East Andes EBA. Both subspecies only recently rediscovered following decades without being... read more

    Recommended citation

    Zimmer, K. & Isler, M.L. (2020). Bicolored Antvireo (Dysithamnus occidentalis). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 27 February 2020).