The reproductive cycles of two narrowly sympatric lacertid lizards from the Namib Desert of Namibia (South-West Africa) were investigated. Aporosaura anchietae is capable of continuous reproductive activity for prolonged periods (Jan 1976-Feb 1977). Reproductive activity declined sharply in March 1977, but quickly increased in April. Recovery was completed by June 1977, and reproduction continued into December 1977 when the study was terminated. Continuous reproduction for more than 1 yr is typical of tropical lizards, but has not been reported previously for a desert species. Causes of the March 1977 reproductive decline are not totally clear, but appear to be related to decreased rainfall, to lower productivity of insects, and to lower levels of stored fat. The average clutch of 85 females was 1.3 eggs (range 1-2), and 2-4 clutches are produced yearly. Meroles cuneirostris has a reproductive cycle typical of temperate zone species, with spermiogenesis occurring May-February (spring-summer), followed by autumnal regression (March) and then recrudescence (April). Oviducal eggs were found over a 5-mo period (Sep-Mar). Clutch size of 29 females averaged 2.9 eggs (range 1-4), and females can produce two clutches each year. Both species have seasonal fat cycles typical of temperate zone lizards, in which fat bodies enlarge in autumn and are depleted by spring, but the relative amounts of fat stored by each species differ considerably. Keywords: Lacertidae, Namib, desert, reproduction, squamata.