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Abstract
The life history and distribution of an introduced population of Adoryphorus couloni Burmeister in the Port Hills of Canterbury is described. The life cycle is of 2 years' duration. Eggs are laid in October-November and hatch after 5–6 weeks. Larvae reach the third stage in February–March and remain in this stage until pupation in January–February of the following year. Adults eclose in March and develop the full oocyte complement in April, but do not emerge above ground, fly, or mate until September. No food was found in the gut of adults at any time. Larval population density reached 250 per m2, but no pasture damage was observed.
