Arid Pacific slope and coast of western Ecuador (I de la Plata, off Manabí, also Puna I and western Guayas, southern Loja) and north-western Peru (south to La Libertad).
 
Population
Estimated population is unknown (2010).
Grey-and-white Tyrannulet (Pseudelaenia leucospodia) [XC275063]
by Robert S. Ridgely from Guayas: Salinas, Ecuador (song)
Grey-and-white Tyrannulet (Pseudelaenia leucospodia) [XC249706]
by Niels Krabbe from Guayas: 3 km E Punta Blanca, Ecuador (call)
Subspecies
No subspecies.
Genus hypothesized to be very close to Stigmatura on basis of numerous cranial and syringeal characters. Species was previously placed variously in Elaenia, Myiopagis and Phaeomyias. Birds from south-western Ecuador sometimes separated as subspecies cinereifrons, but considered probably indistinguishable from others.