Yes, and tanchid are an important fly. However, they don't seem to have much issue in regards to population etc. I'm not exterminating nor killing the flies just protecting the caterpillars. I still lose many caterpillars to the flies. In 2021 when I got 80 successful caterpillars I still had a ton that died from the flies. I was approximately 40% success rate with my caterpillars growing into butterflies the rest 60% died mostly due to the fly.

Thus far in 2024 I have 23 dead from flies. With my other 4 hatched, 11 chrysalis, 12 caterpillars that's 46% dead from flies (thus far) I suspect some of the 12 caterpillars are already gotten by the fly so roughly ~50% dead to the flies thus far.