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Many plant species grow both in the open and in shade. Preferences by phytophagous insects for one habitat or the other are known, but poorly understood. A classic example from biological control is that of the chrysome-lid beetle, Chrysolina quadrigemina, which has a lower oviposition rate in the shade (Holloway 1964, Harper 1977). More recently a number of studies have reported the effects of light and shade on insect herbivores. Futuyma and Saks (1981) showed that two species of Lep-idoptera grew faster and bigger on open rather than shade foliage; unfortunately it is not known how these preferences relate to field distributions. Claridge et al.(1981) suggested that two species of phloem feeding Ty-phlocybinae were segregated, within a plant, between thicker sun leaves and thinner shade leaves because their stylets are of different lengths. Van Emden and Way (1973) found more psyllids on the sun-side …