This paper presents statistical evidence, which seems to be conclusive, that there exists a particular pattern of mortality in Ceylon, India and Pakistan where, contrary to general experience, female mortality is higher than that of the males. The sex ratios of the enumerated population in these three countries are among the highest in the world, and the age pattern of the sex ratios is such that they increase from childhood to adulthood to the old ages. Abnormally high sex ratios and selective migration cannot account for this particular pattern, but there is evidence of a higher degree of under-enumeration of females than males. The main responsible factor, however, seems to be higher female mortality, in the ages of maternity as well as in childhood. This shows the need for a regional or local approach to some demographic problems. In this case, for instance, model life tables based on average international experience are not representative.