THE DIPTERA OF THE BRISTOL DISTRICT. 
55 
This genus is composed of very delicate midg-es, with, generally, 
spotted, pubescent wings, which are very short, being not nearly 
as long as the body. The males have fine plumes to their antennae. 
They sometimes swarm near water. 
Ceratopogon 1 rostratus (Wtz.) 
varius (Wtz.) V.R.P. 
,, pulicarius (L.) S.M., September, and C.J.W. bred it 
from larvae in a decayed cherry tree. 
,, femoratus (F.) Nailsea. June. 
Psychodid^e — Beautiful little flies often seen on windows ; they 
have broad wings, which they carry sloping roof-wise over their 
backs, and which are very hairy ; they have long verticillate 
antennae. The Rev. E. A. Eaton, M.A., F.E.S. , describes 2 thirty 
species from Somerset. 
Pychoda sexpunctata (Curt.) Bristol, also C.J, W. 
,, phalenoides (L.) Clifton. March. 
Pericoma nubila (Mg.) S.M. April. 
Culicid/E — Gnats, that are often called ' Mosquitos.' From their 
biting habits,' and from being responsible for the spread of malaria, 
they have attained notoriety ; only the females however bite ; the 
males, recognised by their beautiful plumose antennae, do not. 
The larvae and pupae are aquatic, and swarm in pools and cisterns. 
The females hibernate in cupboards, hollow trees, or caves. 
Culex annulatus (Schr.) S.M. and Nailsea. November. 
,, nemorosus (Mg.) Nailsea. July. 
,, pipiens (L.) Common everywhere. 
,, ornatus (Mg.) V.R.P. 
Corethra plumiconiis (F '.) S.M. Frenchay, &c. The larvae is quite 
translucent, and looks like a tiny glass rod in the water. 
Anopheles maciilipennis (Mg. ) S.M. December. 
,, bifurcatus (L.) S.M., August ; Freshford, May. 
Ptychopterid^e — Fair-sized gnats, mostly having spotted wings, 
and whose larvae and pupae, which have a long hair-like breathing 
tube, inhabit shallow pools. 
Ptychoptera contaminata (L.) S.M. June, also V.R.P. 
, lacustris (Mg.) Lynmouth. June. 
albimana (F.) S.M. June, also V.P.R. 
,, Scutellaria (Mg.) Near Gloster. C.J.W. 
,, pahidosa (Mg.) S.M. May. 
These are all the British species. 
1 This genus Ceratopogon seems out of place among the Chiron omidse, for 
their larvae are quite different, and inhabit manure heaps. I believe Ceratopogon 
rostratus is parasitic as I have observed a number of these insects flying over a 
beetle, Meloe proscarabwus, and occasionally alighting upon it. They often 
appear in swarms, and the females bite. 
9 Synopsis of the Psyehodidre, Entomol. Month. Mag., 1893. 
