Tyrant-flycatchers (Tyrannidae)

Black-billed Shrike-tyrant (Agriornis montanus) - HBW 9, p. 395

French: Gaucho à bec noir German: Schwarzschnabel-Hakentyrann Spanish: Gaucho Serrano
Other common names: Black-billed Ground-tyrant

Taxonomy: P[epoaza] Montana d’Orbigny and Lafresnaye, 1837, Chuquisaca, Bolivia.
Race intermedius is likely to be a clinal variant of insolens, nominate and maritimus, as it is phenotypically and geographically intermediate between these three races and does not exhibit a constant set of diagnosable features. Described race leucurus (from Patagonia) merged with maritimus, from which it appears indistinguishable. Five subspecies currently recognized.

Subspecies and Distribution:

solitarius P. L. Sclater, 1859 - Andes of S Colombia and Ecuador.
insolens P. L. Sclater & Salvin, 1869 - temperate zone of Peru.
intermedius Hellmayr, 1927 - W Bolivia (La Paz, Oruro) and N Chile (Tarapacá).

See all 5 subspecies

solitarius P. L. Sclater, 1859 - Andes of S Colombia and Ecuador.
insolens P. L. Sclater & Salvin, 1869 - temperate zone of Peru.
intermedius Hellmayr, 1927 - W Bolivia (La Paz, Oruro) and N Chile (Tarapacá).
montanus (d’Orbigny & Lafresnaye, 1837) - E & S Bolivia and NW Argentina (Jujuy S to Tucumán and La Rioja).
maritimus (d’Orbigny & Lafresnaye, 1837) - Andes of C & S Chile (Tarapacá to Magallanes) and WC & SW Argentina (W Mendoza to W Santa Cruz); also C Argentina, in hills of Córdoba, S Buenos Aires and Somuncará Plateau.