. Elementary lessons on insects . Fig. 57.—The work of Hymenopterus parasites. At <* t is shown a dead caterpillar, killed by parasites, some of whictrhave spun their cocoons beside it, others, on the grass blade above. At b is shown an easy way to get the adult parasites: put the cocoons in a vial and stop its mouth with a plug of cotton, and wait for them to appear.

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Keywords: ., bookcentury1900, bookcollecti, bookdecade1920, booksubjectinsects