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Colpotrochia trifasciata
A small ichneumon wasp in the subfamily Metopiinae, averaging 6-10 millimeters in body length. Females possess a very short ovipositor used to lay eggs in caterpillars, particularly leafrollers in the family Tortricidae. The wasp larva develops inside the host, consuming it without disrupting the caterpillar's life cycle until after it pupates; an adult wasp emerges from the host pupa rather than a moth. One of two Colpotrochia species recorded in Massachusetts, with a range extending from the Atlantic coast to barely west of the Mississippi River.