The ecology of Aporosaura anchietae Bocage was descriptionbed by Louw and Holm (1971). In that paper it was i.a. pointed out that this lizard is strictly diurnal, ultrapsmmaphilous (Koch, 1961) and sand diving, that it is an opportunistic feeder on wind blown grass seeds and small arthropods, and has a Iarge storage capacity for food and water. Keywords: Bimodal activity, Daily activity cycle, Endogenous circadian rhythm, Light effect, Light intensity, Modalities, Natural behaviour, Photoelectric cells, Relative humidity, Surface activity, Surface temperatures, unimodal activity.