Abstract
Nymphs of Dactylotum bicolor (Orthoptera: Acrididae) engage in an orderly sequence of diurnal movements within the canopy of their host plant, Baccharis wrightii. Nymphs begin and end the day at the top of the canopy, with morning and late afternoon basking periods and a midday retreat to shaded areas in basal central portions of the host plant. The thermal consequences of these movements were analyzed by measuring body temperatures of free-ranging live nymphs and of dead nymphs placed at various positions within Baccharis canopies. As a result of their diurnal movements, nymphs heat significantly faster than ambient temperature in the morning, yet regulate their body temperatures near the minimum of the range of temperatures available to them during most of the day.
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