Ricinidae

The Ricinidae are a family of a larger group Amblycera of the chewing lice. All species are relatively large bodied avian ectoparasites. They typically exhibit low prevalence and low intensity. They feed on host blood which is atypical in chewing lice. Two or three genera are recognized.
The genus Ricinus parasitize small or medium-sized Passeriformes.
The genus Trochiliphagus is very similar to the former one, considered to be identical with that by some authors, but infest hummingbirds.
The genus Trochiloecetes also parasitize hummingbirds, but – unlike the former genera – their infestations are usually restricted to the head and neck of the host.
The latter two genera constitute the most important members of hummingbirds' parasite fauna, although their ecology is poorly understood.