Abstract
Female eye gnats maintained on honey in the laboratory retained more than half their original radioactivity 5 days after being tagged with P32. When tagged gnats were released at the center of three concentric circles of traps on a windy day, some moved 25 feet directly upwind but an equally large number was caught 75 feet downwind in traps on the outermost circle, on both sides of the mean downwind direction. Releases of tagged gnats ½ and 1 mile from a rural population center in southwestern Georgia resulted in almost complete penetration of the small town on the day of release. In one test, traps more than a mile from the release box caught 15 gnats in less than 3½ hours after it was opened. Chi-square analysis was used to test the hypothesis that tagged gnats are distributed like the wild ones. Local departures from an overall equilibrium between tagged and untagged gnats could be recognized, and progress of the dispersal could be followed by comparing successive collections.
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