Lady beetles such as Coleomegilla maculata DeGeer and Hippodamia convergens Guerin-Meneville have been categorized as income breeders because egg maturation depends on resources available during reproduction. However, capital resources acquired during larval feeding inßuence reproductive success via effects on adult body size and other traits. We produced three sizes of beetles by varying larval access to food and subjected mated females to alternating periods of food surplus and deÞcit. Both

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... ecies exhibited temporal variation in clutch size that reßected changes in income, the amplitude of ßuctuations being greater in H. convergens. Egg mass in C. maculata appeared to increase as a Þxed function of oviposition sequence but also was affected by maternal body size, whereas H. convergens egg mass ßuctuated more in response to food supply. Fertility was largely unaffected by income ßuctuation but appeared constrained by capital, especially in H. convergens. Dynamic changes in reproductive effort (daily mass of eggs/female mass at emergence) mirrored changes in clutch size, the amplitude of ßuctuations being greater in H. convergens, the species with higher reproductive effort. Generally, large females compensated for income ßuctuations better than small females, likely because of their greater capital and possibly an ability to consume larger meals when food was available. The greater sensitivity to income observed in H. convergens likely reßects a higher degree of aphid-speciÞcity compared with the more generalist C. maculata because effective exploitation of ephemeral aphid outbreaks would favor rapid reproductive responses to changes in food supply.