The biology and behaviour of Coleophora Coleophora frischella (L.) at Cressy, Tasmania were found to be similar in many respects to its biology and behaviour in Canterbury. New Zealand. However, the climate at Cressy was less favourable to the flowering of the insect's major host plant, Trifolium repens. and resulted in less synchronisation of insect-host plant development than in Canterbury. As a consequence the insect completed fewer generations than at Canterbury. Parasites and predators, although more numerous than at Canterbury were far fewer than in Europe. Observations were also made on aspects of oviposition, larval feeding and the site of pupation and duration of larval stages.