The northernmost representative of the genus Thalurania is confined to western Mexico, where it occupies a comparatively small range in the states of Nayarit, Jalisco, and Colima. It is considered globally Vulnerable by BirdLife International on account of its apparent dependence on the steadily shrinking forest habitats available to it. However, rather little is known concerning the species’ life history and precise habitat requirements. In terms of its plumage, the Mexican Woodnymph is broadly similar to other Thalurania. Males are mainly green, albeit slightly duller below, with a violet-blue forehead patch, and bluish-black, slightly forked tail, whilst females are green above with a darker tail and wings, and largely grayish underparts, with a small whitish post-ocular spot.