Abstract
A key is provided to identify third-instar larvae of the 9 species of calliphorids causing flystrike and associated with carrion in New Zealand. The species are: Calliphora hilli Patton, C. quadrimaculata (Swederus), C. sygia (Fabricius), C. vicina Robineau-Desvoidy, Chrysomya megacephala (Fabricius), Ch. rufifacies (Macquart), Lucilia cuprina (Wiedemann), L. sericata (Meigen), and Xenocalliphora hortona (Walker). New morphological characters, located on the membrane between the head and thorax, are used to separate third-instar larvae of L. cuprina and L. sericata.