Abstract
With the aid of reflective patches fixed to flies, nocturnal resting sites of Glossina morsitans Westw. released in teak woodland near the Mashi River in Zambia were detected by torchlight. Within this habitat, sites on the margins of woody vegetation were chosen for the tests, so as to slow up fly dispersal and raise the chances of seeing the marked flies. Over 500 flies were marked and released, and of these 82 (16%) were subsequently seen resting, the maximum height recorded being 20 ft. above ground-level. The distribution of resting heights is shown in tables. Leaves and small twigs comprised 77 per cent, of the nocturnal resting sites. In one series of tests, the proportion of marked flies detected was considerably lower than in other tests, and an environmenal factor is thought to be the cause.
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