Abstract
The effect of two wasp species. Stictia carolina (F.) and Bembix texana Cresson, predators of horse flies in some areas of Louisiana, on tabanid populations in South Louisiana was studied in 1965. Weekly counts of fly and wasp populations on and around cattle, respectively. indicated that population densities of 2 or more wasps per animal noticeably reduced the tabanid population. During 3 consecutive days in July 9 S. carolina females carried an average of 3.1 tabanids daily to their burrows. No other prey was captured by this species during the study period. Seven B. texana females carried an average of 3.9 flies per day to their burrows during 2 consecutive days in August, however 92.3% of the flies was composed of species of Sarcophagidae, Stratiomyidae, and Syrphidae.
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