Abstract
Data given show that in Jamaica, Leptoconops Becquaerti is polymorphic for wing length in both sexes. The polymorphism is associated with autogeny so that in a given population the smaller ♀♀ are autogenous, the larger anautogenous. The autogenous ♀♀ emerge from the pupa with ovaries already in early Stage IV of development; at 26.6°C egg maturation is completed within 24–36 hr post-emergence. The number of eggs produced autogenously in the 1st gonotrophic cycle is comparable with that seen in anautogenous ♀♀ fully engorged with blood and kept under optimum conditions. Larval environment does not appear to affect the expression of autogeny by regulating the proportion of ♀♀ that produce eggs without taking blood. Instead, it appears that wing length polymorphism and autogeny are entirely under genetic control. Some observations on mating and resting behavior in the field are described. Reasons are given for believing that human discomfort is caused almost entirely by anautogenous ♀ L. becquaerti .
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