These were accidentally acquired along with a Platanthera orchid I'd collected on July 1, 2021, south of the Peace River in British Columbia, Canada, north of Jackfish Lake Road.
Host plant here:
https://inaturalist.ca/observations/101914155
These beasties turn up in the plant press, munching their way through my nice Platanthera specimen inflorescences...these are pics of a few dried out ones that were still stuck to the flowers.