Plain-capped Starthroat

The plain-capped starthroat (Heliomaster constantii) is a species of hummingbird in the "mountain gems", tribe Lampornithini in subfamily Trochilinae. It is found from Mexico to Costa Rica. == Taxonomy and systematics == The plain-capped starthroat has three subspecies, the nominate H. c. constantii, H. c. pinicola, and H. c. leocadiae. == Description == The plain-capped starthroat is 11 to 13 cm (4.3 to 5.1 in) long. Males weigh about 7.4 g (0.26 oz) and females about 7.2 g (0.25 oz). Both sexes of all subspecies have a long, almost straight, black bill and a white streak behind the eye. The sexes have essentially the same plumage. The nominate subspecies has metallic bronze green upperparts with a wide white streak on the rump; the crown is less metallic than the rest. Much of the face is dusky, with a wide white "moustache". The chin is sooty to blackish and the gorget ranges from several shades of bright metallic red to purplish red. The underparts are browish gray with a white belly. The undertail coverts are pale gray with wide white tips. The flanks have a large tuft of white feathers. The central pair of tail feathers are bronze green with dusky…