Abstract
1. 1. Behavior patterns and thoracic temperatures of butterflies from four species inhabiting the lowlands of New Guinea were observed in sunshine and shade. Two of these species, Precis villida and Mycalesis elia, exhibited thermoregulatory behavior. 2. 2. Thoracic temperature in dead butterflies, and those rendered incapable of movement, rose to 44–52°C in about a minute in direct mid-day sunshine when convection was minimized. Nevertheless, P. villida remained in sunshine at mid-day, even at 33°C where thoracic temperature usually remained <43°C. 3. 3. Light, darkly pigmented and black butterflies were all highly reflective in the near infra-red. 4. 4. The role of the wings is discussed with regard to thermoregulation and energy balance.
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