Abstract
Water traps and dry traps were used to assess the locomotor activity of the hairy spider beetle, Ptinus villager (Reiter), at the surface of stored wheat. Insects were counted in the traps at 3-hr intervals for 45 hr. More insects were taken in water traps than in dry traps. Insect locomotor activity at the grain surface was arrhythmic according to counts in dry traps. Water-trap counts indicated that the intensity of the humidity response of P. villiger was greater in the late morning than at other times.

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