Family Tyrant-flycatchers (Tyrannidae)

Least Concern

White-rumped Black-tyrant (Knipolegus heterogyna)


French: Ada à croupion blanc German: Nordperu-Dunkeltyrann Spanish: Viudita del Marañón

Knipolegus aterrimus heterogyna


, 1907,

Cajabamba, Peru


Hitherto treated as conspecific with K. aterrimus, but differs in its (in female) darker, better-defined cap offset by vague whitish collar (1); buff-white rump-band and whitish uppertail-coverts vs pale chestnut rump and uppertail-coverts (3); all-dark vs rufous-edged outer rectrices (2); white vs pale rufous vent (ns[1]); three-note vs two- or one-note song (2), lower-pitched than songs of the others (1). Monotypic.

What do (1) and (2) mean? Learn more about the scoring system.

N Peru (Marañón Valley from Cajamarca S to Ancash).

Descriptive notes

16–17 cm. Very similar to formerly conspecific, but allopatric, K. aterrimus, but female has darker upperparts with much whiter wings markings, paler underparts and... read more


Very poorly known; song comprises three notes, with the first note steeply downslurred, the second... read more


Montane scrub and dry forest, at elevations similar to those occupied by K. aterrimus.

Food and feeding

No data, but presumably insectivorous or primarily so.


No information.



Status and conservation

Not globally threatened (Least Concern). Very poorly known and overall range is not large (estimated at just 22,600 km²). Probably largely confined to Marañón Valley EBA, an... read more

Recommended citation

del Hoyo, J., Collar, N. & Kirwan, G.M. (2019). White-rumped Black-tyrant (Knipolegus heterogyna). 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 12 December 2019).