(i) POPULATION STUDIES OF INSECTS IN WATER-FILLED TREE-HOLES.

A conference paper about insects in water-filled tree-holes is presented. It describes the population variations and life-histories of the insect species chironomid Metriocnemus martinii Thienemann and the ceratopogonid Dasyhelea found regularly in Wytham Woods, in Berkshire, England. In this study, the population curves for larvae and pupae had been recorded in various tree-holes and varied from hole to hole as well as from season to season.