Images marked with an asterix * were not taken in Leicestershire but show species which are regularly seen in the County.

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True flies (order Diptera) are an immense group with over 100,000 known species. They all have their hind pair of wings reduced to pin-shaped structures called halteres which act as gyroscopes to maintain balance in flight. Most feed on liquids, including nectar and blood.
Crane Flies - Tipulidae + Limonidae
Spotted Crane Fly - Nephrotoma appendiculata
Nephrotoma quadrifaria
Tipula oleracea
Tipula vernalis
Spotted Crane Fly
Nephrotoma quadrifaria Tipula oleracea Tipula vernalis
Limonia nubeculosa
Limonia nubeculosa
     
Ptychopteridae
Ptychoptera sp.
Ptychoptera sp.
     
Chironomidae
Chironomus plumosus
Chironomus plumosus
     
March Flies - Bibionidae
Bibio lanigerus
Bibio angelicus
Fever-fly - Dilophus febrilis
Bibio lanigerus
Bibio angelicus Fever-fly - Dilophus febrilis  
Soldier Flies - Stratiomyidae
Stratiomys potomida
Microchrysa polita
Stratiomys potomida
Microchrysa polita    
Rhagionidae
Chrysopilus cristatus
Rhagio lineola
Chrysopilus cristatus
Rhagio lineola    
Horse Flies - Tabanidae
Chrysops relictus
Chrysops relictus
     
Bee Flies - Bombyliidae
Bee Fly - Bombylius major
Bombylus major
     
Dance Flies - Empididae (+ relations)
Dance Fly - Empis opaca
Empis tessellata
Poecilobothrus nobilitatus
Dolichopus popularis
Empis opaca
Empis tessellata Poecilobothrus nobilitatus Dolichopus popularis
Pictured-Wing Flies - Tephritidae
Thistle Gall Fly - Urophora cardui
Thistle Gall Fly - Urophora cardui
     
Psilidae - Rust Flies
Psila fimetaria
Psila fimetaria
     
Sepsidae
Nemopoda nitidula
Sepsis fulgens
Nemopoda nitidula
Sepsis fulgens    
Tachinidae
Tachina fera
Dexiosoma caninum
Exorista rustica
Tachina fera
Dexiosoma caninum Exorista rustica  
Blow Flies - Calliphoridae
Bluebottle - Calliphora vomitoria
Calliphora vicina
Greenbottle - Lucilia caesar
Bluebottle - Calliphora vomitoria
Calliphora vicina Greenbottle - Lucilia caesar  
Pollenia Sp.
 
Cluster fly - Pollenia rudis Pollenia Sp.    
Dung Flies - Scathophagidae
Scathophaga sp.
Yellow Dung Fly Scathophaga sp.    
House-Flies - Muscidae
Mesembrina meridiana
Polietes lardaria
Phaonia subventa
Phaonia tuguriorum
Mesembrina meridiana
Polietes lardaria
Phaonia subventa Phaonia tuguriorum
Graphomyia maculata
Graphomyia maculata
Anthomyia pluvialis
Helina impuncta
Graphomyia maculata - female
Graphomyia maculata - male Anthomyia pluvialis Helina impuncta
Hydrotaea similis
Morellia simplex
Fannia sp.
Mydaea corni
Hydrotaea similis Morellia simplex Fannia sp. Mydaea corni
Musca autumnalis
Haematobosca stimulans
Musca autumnalis Haematobosca stimulans    
Anthomyiidae
Hydrophoria lancifer
Hydrophoria lancifer      
Neottiophilinae
Neottiophilum praeustum
Neottiophilum praeustum