The western emerald (Chlorostilbon melanorhynchus ) is a species of hummingbird in the family Trochilidae. While most taxonomic authorities recognize it as a separate species, the Birdlife International checklist considers it as a subspecies of either the blue-tailed emerald, C. mellisugus, or the red-billed emerald, C. gibsoni.
It is found at altitudes from 600-2700m in Colombia and Ecuador.
Its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist montane forest, and heavily degraded former forest.
A small hummingbird. Males are entirely glittering emerald with a dark blue, deeply forked tail. Females are similar but with pale grey underparts, a dark cheek and a white line behind the eye.
