THE DIPTERA OF THE BRISTOL DISTRICT. 
75 
Conicera atra (Mg\) Bristol, June. They sometimes dance in 
swarms in the air, like midges. 
Hippoboscid^ — Curious flat, louse-like flies, that live as external 
parasites on birds and mammals. They are ' pupiparous,' the 
larvas passing- its life within its parent and pupating in its body. 
Ornithomyia aviculare (L.) Bristol, on Heron, Red Grouse, and 
Long-eared Owl ; also V.R.P. 
Stenopteryx hirundinidis (L.) S.M., on House Martin. 
Oxypterum pallidum (Leach) Bristol, on Swifts. 
Melophagus ovinus (L.) Common on sheep. I have found them on 
a horse. 
Braulid^e — Curious wingless and crab-like insects found on 
hive-bees. 
Braula cceca (Nitz.) Bristol, sometimes common. It is wingless 
and blind. 
Nycteribid^e — Spider-like parasites of bats. 
Nycteribia hermanni (Leach) On Rhinolophus hipposideros, found in 
Cheddar Caves by T. A. Coward, F.Z.S. 
I should wish to ackuowledoe the kindly help, in naming some of the species, 
I have received from the late Mr. G. H. Verrall, F.E.S., and Mr. J. E. 
Collin, F.E.S. 
