The Tabanidae (horseflies and deerflies) attracted to a horse, were studied in the eastern Amazon Basin. Year-long studies of the seasonal activity patterns of tabanid species were made in two areas: (1) Morelândia ranch, km 60n the PA-408 highway, Municipality of Benevides, monthly from May, 1980, to June, 1981, in both primary forest and planted pasture, with a total of 20190 specimens of 46 tabanid species collected; (2) "APEG " forest preserve on the Guamá River margin near Belém, from September, 1982, lo December, 1983, with a total of13835 specimens of38 tabanid species collected. The correlation of certain climatic factors with lhe seasonal abundances of common tabanid species was investigated and statistical/y significant relations were found for some species with air temperature, relative humidity of the air, rainfall, insolation, evaporation potentiality or light intensity. This research provides baseline data
For future studies of strategies to control these important pest and vector horsely species
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