Abstract
An adult. Hippelates eye gnat survey was conducted in the San Joaquin Valley near Fresno, California, from March 1960 to March 1961. Collecting equipment and techniques included egg bait traps and human attractants. A reliable volumetric method of estimating numbers of eye gnats in large collections was developed. Hippelates collusor (Townsend), a highly anthropophilous species, was found in greatest numbers and was observed to be the most important pest of man. The second most numerous species trapped, H. robertsoni Sabrosky, was not an important pest of man. Small numbers of two minor species, H. dorsalis Loew and H. microcentrus coquillett, also were taken. The numbers of H. Collusor were related to average weekly temperatures throughout the year. The numbers of H. robertsoni increased with average weekly temperatures until the average temperatures exceeded 70° F., then declined. The threshold of gnat. activity in terms of average weekly temperature was approximately 50° F.
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