68 THE DIPTERA OP THE BRISTOL DISTRICT. 
Sarcophaga agricola (Mg.) Redland and Freshford, May. 
,, nigriventris (Mg.) Bitton, July. CJ.W. has bred it at 
Painswick from decayed snails. 
hcemorrhoa (Mg - .) Redland and S.M., June. 
hcemorrhoa var setipennis (Rnd.) R.V.P. 
infantula (Rnd.) Stonehouse, June. 
dissimilis (Mg.) V.R.P. 
hcematocles (Mg.) V.R.P. 
, , hczmorrhoidalis (Mg. ) Horfield, July, rare. 
nurus (Rnd.) Redland, common in June. 
Metopia leacocephala (Rossi.) Cranham (Wainwright). 
,, campestris (Fin.) Leigh Woods, August, rare. 
The larvae of these two species are parasitic on larvae of sand- 
wasps ; the flies are distinguished by their brilliant white faces. 
Dexinje — A sub-family of the Tachinidae, said to be parasitic in 
the larval stage on beetles and snails. 
Dexia vacua (Fin.) Cheddar, July and August, and CJ.W. 
,, rustica (F.) V.R.P. 
Dexiosoma. caninum (F.) V.R.P. 
Muscid^e — True flies, such as blue-bottles and house flies. 
Stomoxys calcitrans (L.) 'The sting fly,' common about houses in 
autumn, rather like a house fly, but is greyer, and the proboscis 
is evident, pointing forwards under the head. It is a sharp biter. 
PoUenia vespillo ( F. ) V. R. P. 
,, rudis (F.) Common everywhere ; hibernates in holes in 
tree-trunks or in houses. 
Myiospila meditabunda (F.) Taunton and Bitton, also V.R.P. 
Graphomyia maculata (Scop.) Sometimes common. A handsome 
little fly. 
Musca domestica (L.) ' The housefly,' very common everywhere, 
does not generally appear in-doors before June. 
corvina (F.) Very abundant in spring. The larvae sometimes 
hatches out, and remains for a while within the parent. 
Cyrtoneura stabidans (Fin.) Very common. Hibernates in-doors in 
swarms. 
Morellia simplex (Lw.) Common. I found a number of the larvae 
living on the dead bees in an old hive. 
,, hortorum (Fin.) Very common. 
,, curvipes (Mcq.) Not common. S.M., October. 
Mesembrina meridiana (L.) Common. A handsome black fly, with 
the base of the wings yellow. Viviparous. 
Pyrellia cadaverina (L.) V.R.P. 
serena (Mg.) V.R.P. 
,, lasiopthalma (Mcq.) Batheaston (Blathwayt). 
eriopthalma (Mcq.) S.M., August. 
