This hummingbird has a dark head, white breast feathers, and a shining blue rump. It feeds at flowers in Bolivia's highlands.
The plumage is mainly black, with white breast feathers and a shining blue rump.
It visits flowers for nectar and can be locally common where flowers are abundant in Bolivia.
It is about 13 cm long, with a short, straight black bill.
The male has a rufous tail contrasting with its glossy blue-green rump.
An extinction-risk assessment has not been added yet.