The fossorial coral snakes of the genus Micrurus comprise 53 species (Campbell and Lamar, 1989), These snakes are essentially a Neotropical radiation of the cosmopolitan front-fanged family Elapidae (Cadle and Sarich, 1981). Investigations by Quinn (1979) and Jackson and Franz (1981) of Micrurus fulvius from the southeastern United Stated are the main studies on the reproductive ecology of Micrurus. For neotropical species, reproductive data are meager (e.g. Duellman, 1978, Solorzano and Cerdas, 1988). Apart from scattered and anecdotal reports on reproduction (Azevedo, 1960, 1961), Amaral, 1978; Pontes and Di-Bernardo, 1988) amost nothing has been published on the reproductive ecology of snakes from the Atlantic forest in Brazil, especially for Micururus. The present study provides information on seasonal reproductive timing, clutch size, neonate size, inferred growth rates and ages at sexual maturity and seasonal surface activity of the coral snake, Micrurus corallinus from a tropical region in Brazil.