Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, USA (B).
Southern USA (southern Arizona, southern Texas) and Mexico (including Yucatán Peninsula and islands of Holbox and Cozumel) south to north-western Costa Rica.
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is 2,000,000 (2010).
Northern Beardless Tyrannulet (Camptostoma imberbe) [XC817692]
by id from Constituci\u00f3n, Buenaventura, Chihuahua, Mexico (call, song)
Northern Beardless Tyrannulet (Camptostoma imberbe) [XC758985]
by Richard E. Webster from San Bernardino National Wildlife Refuge, Cochise County, Arizona, United States (call)
Subspecies
No subspecies.
Forms a superspecies with Southern Beardless Tyrannulet (Camptostoma obsoletum). The two overlap slightly without intergrading in west-central Costa Rica. Birds from southern USA (Arizona) and north-western Mexico, supposedly longer-billed, more olive above and more yellow below, described as subspecies ridgwayi. Birds from Cozumel I, named as thyellophilum on basis of minute differences in mean culmen length in a small sample. However, both considered indistinguishable from other populations.
BirdLife International Species Factsheet