
Tachina is a genus of large flies in the family Tachinidae, most have larvae that are parasitoids of Lepidopteran caterpillars. There are approximately 600 species worldwide. ...
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http://en.wikipedia.org/wiki/Tachina

• (n.) Any one of numerous species of Diptera belonging to Tachina and allied genera. Their larvae are external parasites of other insects.
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http://thinkexist.com/dictionary/meaning/tachina/
Tach'i·na noun ;
plural Tachinæ . [ New Latin , from Greek ..., for ... swift.]
(Zoology) Any one of numerous species of Diptera belonging to
Tachina and allied genera. Their larvæ are external parasites of other insects.
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http://www.encyclo.co.uk/webster/T/2
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