54 
THE DIPTERA OF THE BRISTOL DISTRICT. 
Bibio ferruginatus (Gmel.) V.R.P. 
venosus (Mg\) S.M., May, and V.R.P. 
,, laniger (Mg.) Leigh Woods. May. 
The sexes are very different in Bibio, and the eyes are very hairy. 
There are 15 British species. 
Simulid^: — Sand flies. Very small, hairy, black flies. Some- 
times very abundant, and a great nuisance from the females' biting 
habits. The larvae live in the stems of water plants. The males 
fly in circles in the air. Often found in cold weather. C. J. W. has 
found them in numbers on the ears of horses. 
Simulium reptans (L.) S.M. March. 
,, ornatum (Mg.) Stonehouse. June. 
Chironomid^e — 'Midges' that do not bite. The males have beauti- 
fully feathered antennae. Sometimes seen in clouds by the water 
side. The larvae are mostly aquatic, the ' bloodworms ' seen on the 
mud in ponds are some of them ; a few live in earth or dung. The 
species are very numerous, over 300 have been described. Asexual 
reproduction has been observed in some species. The eggs are 
imbedded in long, gelatinous masses. 
Corynoneura mitiuta (Winn.) S.M. A very minute, black midge. 
Chironomus plumosus (L.) Common throughout the district. A 
large and handsome midge, half-an-inch long. 
,, pallens (Mg.) Taunton. May. 
,, virescens (Mg.) Nempnett, by the lake, in immense 
swarms. 
, , dorsalis ( Mg. ) V.R.P. 
pedellus (Drg.) V.R.P. 
pedestris (Mg.) V.R.P. 
,, albimanus (Mg.) S.M. May. Distinguished by the 
white metatarsi. 
Cricotopus annulipes (Mg.) S.M., April, also V.R.P. 
,, bicinctus (Mg.) S.M. September. 
This is a genus of delicate, fairy-like midges, the males with 
beautifully plumose antennae, and the legs largely barred with white. 
Orthocladius variabilis (Staeg.) S.M. February. 
,, notatus (Mg.) S.M. April. 
Camptocladius aterrimus (Mg.) Tiny black midges that occur in 
great numbers in the coldest weather. Common everywhere. 
Metriocnemus fuscipes (Mg. ) Redland. April. 
, , co-equatus ( Mg. ) V. R. P. 
Tanypus varius (F.) S.M., April, and V.R.P. 
,, nebulosus (Mg.) S.M. August. 
,, choreus (Mg.) S.M. May. 
,, pimctatus (F.) Bitton. July. 
, , punctipennis ( Mg. ) V. R. P. 
feruginecollis (Mg.) S.M. September. 
