Abstract
Determination of sex-ratios associated with large numbers of insects (trap catch, quadrat samples, etc.) is a recurrent problem in entomological research, frequently involving tedious microscopic examination of individuals. Considerable savings in time and money may result from use of an appropriately designed sequential sampling procedure for estimating sex-ratio. Sequential sampling has enjoyed a deserved popularity in recent years (e.g., see Gonzalez 1970), a3 an efficient means of estimating infestation levels of pest populations with regard to their location above or below a critical value (usually the economic threshold). The basic techniques for this type of sequential sampling (reviewed by Waters 1955) are, however, inappropriate for sex-ratio estimation.
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