Tyrant-flycatchers (Tyrannidae)

Blue-billed Black-tyrant (Knipolegus cyanirostris) - HBW 9, p. 378

French: Ada à bec bleu German: Einfarbdunkeltyrann Spanish: Viudita Picoceleste

Taxonomy: Muscicapa cyanirostris Vieillot, 1818, Paraguay.
Monotypic.

Distribution: SE Brazil (N to Minas Gerais and Espírito Santo), Uruguay and NE Argentina (Misiones S to Buenos Aires); S populations winter N to SC Brazil (S Mato Grosso) and E Paraguay.