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      Tachinid Flies



Tachinid Fly
There are a large number of flies in this family (8200+) and all produce larvae that live within other insect larvae and in the case of some beatles the adults. Most species end up killing their host but a few live in harmony (ie. parasitic).  Those that kill their host are known as paracitoid.
These flies are distributed over much of the world and are beneficial pollinators.  Many have been introduced into America to help with the pollination but silkworm rearers are not too happy about this.