Abstract
An account is given of the occurrence of Pandinus imperator imperator (C. L. Koch) and Buthus hottentotta hottentotta Fabricius which are two common species of scorpions in Nigeria. P. imperator is essentially a forest species commonly found in the lowland rain forest zone, while B. hottentotta typically lives in the savannah and has a much wider distribution stretching from the derived savannah to the Sudan zone. During aktograph experiments, P. imperator showed greater locomotory activity during the daytime than at night. In contrast, B. hottentotta was markedly nocturnal. The normal rhythm of locomotory activity of B. hottentotta was greatly affected by constant artificial illumination (20 foot candles) and constant darkness. The rate of water‐loss of P. imperator in dry air was greater than that of B. hottentotta. The experimental results are discussed in relation to the behaviour of the scorpions in their natural habitats.
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