The sampling for Tabanidae in a three county area of the Texas Rolling Plains was done in 1978 and 1979 to determine the seasonal distribution of Tabanus abactor Philip. Environmental data were gathered as well to show correlation between environmental abiotic factors and the population fluctuations of this species. Geographical distribution studies were conducted within boundaries of the Texas Rolling Plains for this two year period also. Tabanus abactor was shown to be present from mid-June to mid-September in the three county area and was found inhabiting forty-six of the sixty-two counties within this geographical region.