66 THE DIPTERA OF THE BRISTOL DISTRICT. 
Conopid/E — Medium sized wasp-like flies, black and yellow. The 
larvae are parasitic in the bodies of humble-bees. 
Conops quadrifasciatus (Deg\) S.M. and Cheddar in August, and 
V.R.P. 
Oncomyia atra (F.) Pains wick, C.J.W. 
,, pusilla {Mg.) Very rare, S.M., August, Stroud (Wain- 
wright). 
Sicus ferrugineus (L.) Cheddar and Stapleton, August. 
Myopa buccata (L.) V.R.P. 
,, testacea (L.) Batheaston (Blathwayt). 
,, poly stigma (Rnd.) Painswick, C.J.W. 
GEstrid^ — ' Bot Flies,' larvae parasitic in cattle, horses, and 
sheep, &c. 
Gastrophilus equi (F.) The fly seems scarce, Wellington (Blathwayt) 
and C.J.W. The larvae seems common in horses everywhere. 
(Estrus ovis (L.) The fly at Painswick, C.J.W. The larvae occurs 
in the nostrils of sheep. 
Hypoderma bovis (Dig.) Very rare, Bitton, July, and C.J.W. I only 
caught the fly twice, once at Bitton and once in North Devon. 
The larvae is too common in tumours on the backs of cattle. 
For the extraordinary life-history, see Journal Royal Micros. 
Soc, 1908; also Miss Ormerod, "Flies Injurious to Stock"; 
also (for H. lineatum) Board of Agriculture Leaflet 21. 
Tachinid^e — A large family of spiny and hairy flies, mostly black 
or grey. In the larval stage they are parasitic in the bodies of 
other insects, oftenest in lepidopterous larvae. The life-histories 
of many are unknown. 
Heteronychia chcetoneura (Br.) Chalford and Selsby, Glos. (Wain- 
wright). 
Engyops micronyx (Br.) Cranham (Wainwright). 
Melanomyia nana (Mg. ) Chalford (Wainwright). 
Thelairia leucozonce (Pz.) Redland, frequent. Have bred it from a 
noctuid pupa. 
Nyctia halterata (Pz.) V.R.P. 
Meigenia bisignata (Mg.) Cranham, Glos. (Wainwright). 
floralis (Mg.) Chalford and Selsley (Wainwright). 
Ceromasia stabulans (Mg.) V.R.P. 
senilis (Mg.) V.R.P. 
Gymnochceta viridis (Dw.) Brilliant metallic green, Stroud (Wain- 
wright). I have found it common in North Devon. 
Blepharidea vulgaris (Fin.) Selsley (Wainwright), bred from larvae 
of the gooseberry-moth, A. grossulariata. 
Aporomyia dubia (Fin.) Selsley (Wainwright). 
Bothria ccesifrons (Mcq.) Selsley (Wainwright). 
