Phasia obesa

Phasia obesa is a species of 'parasitic flies' belonging to the family Tachinidae subfamily Phasiinae.

Distribution
This fly is present across the palaearctic ecozone, British Isles, Czech Republic, Estonia, Hungary, Lithuania, Poland, Romania, Slovakia, Ukraine, Denmark, Finland, Norway, Sweden, Bosnia and Herzegovina, Bulgaria, Corsica, Croatia, Cyprus, Greece, Italy, Portugal, Serbia, Slovenia, Spain, Turkey, Austria, Belgium, France, Germany, Liechtenstein, Netherlands, Switzerland, Japan, Kazakhstan, Iran, Israel, Lebanon, Palestine, Mongolia, Morocco, Russia, China, Transcaucasia.

Description
The adults grow up to 4 - 6 mm long. Their large compound eyes are reddish. Antenna, including arista, are black. The body is greyish, with four longitudinal black bands interspersed with clear bands of the same thickness on mesonotum. The side of thorax  shows black setae. The abdomen is black. The large wings show a light brownish shading. The cell R5 is closed at the edge. Basicostae are black. In the males eyes are separated by a distance  narrower  than the ocellar  triangle.

Biology
Adults can mostly be encountered from June through September feeding on nectar of flowers (especially of Asteraceae species).

Larvae of Phasia obesa are parasitoids on adults or nymphs of various species of plant bugs (Neottiglossa sp. and  Zicrona caerulea Pentatomidae, Leptopterna dolabrata and  Beosus maritimus Miridae,  Lygus pratensis,  Lygus rugulipennis Lygaeidae,  Myrmus miriformis Rhopalidae, etc.).