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, the British Isles, the 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 and Transcaucasia.

Description

The adults grow up to 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.
Larvae of Phasia obesa are parasitoids on adults or nymphs of various species of plant bugs.