Spider-fly (Ornithomyia), a genus of dipterous insects closely allied to the Forest-fly, but parasitic on birds, not on quadrupeds. Thus, O. avicularia frequently infests the common fowl, the blackcock, and other birds in Britain. It is greenish yellow, with smoke-coloured wings.
Spider-fly
Chambers's Encyclopaedia, Volume 9: Bound to Swansea, p. 631
Source scan(s): p. 0650