A Cambium miner, of basket willows (Agromyzidae) and its inquiline gall midge (Cecidomyidae)

SUMMARY. 1. A brief resume is given of the information available concerning Dipterous cambium miners (Agromyzidae). 2. The morphology of the egg, larva, pupa and adult of Dizygomyza barnesi sp.n. Hendel is described. 3. The bionomics of this fly receive detailed attention. There is only one brood a year and the larvae mine in the cambium of different species of Salix. Pupation takes place in the soil. While S. viminalis is attacked most commonly, S. triandra, S. purpurea, S. viminalis?purpurea and S. triandra?viminalis occasionally suffer. In addition the larvae can live on S. caerulea. The damage caused by the larvae is considerable. The Braconids, Symphia ringens Halid. and S. hians Nees, are recorded as primary parasites. 4. Two gall midges are described, the larvae of one living as inquilines in the burrows of the Dizygomyza larvae. The bionomics of this species are described.