Thelaira nigripes

Thelaira nigripes is a species of fly in the family Tachinidae first described by Carl Fredrik Fallén in 1817. It parasitizes moths such as Arctia caja by laying eggs in the larvae that eventually kill the host.

Distribution
British Isles, Czech Republic, Estonia, Hungary, Latvia, Lithuania, Moldova, Poland, Romania, Slovakia, Ukraine, Denmark, Finland, Norway, Sweden, Bulgaria, Croatia, Greece, Italy, Macedonia, Portugal, Serbia, Slovenia, Spain, Austria, Belgium, Channel Islands, France, Germany, Netherlands, Switzerland, Japan, North Korea, South Korea, Iran, Russia, Transcaucasia, China, Japan, Taiwan.