This small warbler is common in Mexico's mountain pine forests and sometimes moves to lower elevations in winter.
It is about 11 cm long, with a blue-gray head, white eyebrow, and yellow throat and breast. The thin reddish-brown chest crescent may be faint or absent in some females and young birds. Its gray wings are plain, without wing bars.
It mainly inhabits mountain pine forests in Mexico; some birds move to lower elevations in winter.
Its song is a brief, dry buzz, and its call is a short, high note.
An extinction-risk assessment has not been added yet.