A suction trap was used to collect adult Nematocera from the equatorial Lake George, Uganda. The dominant species, Chaoborus (Neochaoborus) anomalus Edwards, Chaoborus (Sayomyia) ceratopogones and Procladius (Procladius) brevipetiolatus Goetghebuer, all showed a lunar periodicity of occurrence in the samples being most abundant in the first quarter of the lunar month and least abundant in the third quarter. Chaoborus also showed a seasonal variation in occurrence, not apparent in Procladius. Observations on sex ratios and on longevity, swarming and oviposition behaviour of Chaoborus made at Lake George and at the neighbouring Lake Edward are also described.
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LESLEY M. McGOWAN (1975) studied this question.
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