Abstract
The efficiency of an entomophagous parasite may be defined as the capacity which it possesses for distributing its eggs among the available host population in such a manner that its progeny have the best possible chance of survival. This capacity is determined by a number of factors which are, as yet, imperfectly understood. Among these factors are the ability of the parasite female to discriminate between hosts which are suitable for the development of her progeny and those which are not; the relative densities of the parasite and host populations; the habits of the host insect; and the behaviour of the parasite itself during oviposition.

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