Abstract
Data collected during the Screw—Worm Eradication Program in the southwestern United States and northern Mexico provided opportunity for the development of contour maps to show the incidence of larvae of the screw—worm fly, Cochliomyia hominivorax (Coquerel), in animal wounds. An empirical technique was developed for choosing biologically meaningful contours and for actual contour plotting. This approach to the study of population dynamics should be useful in studies of other animals.

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