This article uses reconstituted family data from birth, death, and marriage registers to measure ex-nuptial fertility and premarital pregnancies in nineteenth-century Tasmania. It also examines the extent to which convict origins of European society on the island caused a departure from English norms of family formation behavior, during a period when men greatly outnumbered women. Illegitimacy was high during the convict period. From the mid-1850s, after the convict system collapsed, levels of ex-nuptial births were relatively constant until the end of the century, as indicated both by the illegitimacy rate and by the proportion of marriages associated with prenuptial births. By the end of the nineteenth century, rates of illegitimacy and p...