The spatial pattern of Hypera postica (Gyllenhal) in Kentucky alfalfa fields was investigated using Taylor's and Iwao's distribution functions as statistical models. Field counts of the insect in 2 contiguous plots where the populations were relatively low conformed to an overdispersed pattern. However, at a 3rd plot where the density was high, numerous population aggregates were formed and they dispersed in the direction of randomness. Randomness also increased with development of the larvae, partially owing to mortality caused by the 2 parasitic Bathyplectes spp. For all stages the variance was proportional to a fractional power of the mean. Taylor's power function b varied with environment. Use of one-quarter square foot samples for estimating egg populations had little effect on the skewness of the distribution. Two transformations are offered for stabilizing the variance of overdispersed field counts. However, only the square root transformation stabilized the variance of counts in the plot where the populations were randomly dispersed.