|Cuckoo Wasps. Lays eggs in the nests of other wasps. Can roll themselves into a ball and are heavily sclerotized to protect themselves against the stings of the wasps they are parasitizing. Members of the subfamily Chrysidinae are metallic green or blue.|
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Insects of Australia (Chapter 42: Hymenoptera)
CSIRO, Division of Entomology
1137pp (2 volumes), Melbourne University Press, 2nd Edition 1999.