Thelaira leucozona is a species of fly in the family Tachinidae first described by Georg Wolfgang Franz Panzer in 1806.

[4][5][6] It parasitizes moths such as Arctia caja by laying eggs in the larvae that eventually kill the host.

[5] Great Britain,[7] Czech Republic, Hungary, Latvia, Poland, Bulgaria, Italy, Serbia, Austria, France, Germany, Switzerland, Japan, Russia, Transcaucasia, China.

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