Abstract
The tabanid fauna of the eastern part of Hokkaido, Japan, was surveyed at 14 sites by collecting adult females with a mosquito-net trap baited with dry ice on August 9-11,1985. A total of 3,567 adult females belonging to 5 genera and 13 species were collected. Haematopota tristis was the most predominant occupying 86.6% of the total catch, then followed by Hybomitra olsoi (4.4%), Tabanus chrysurus (3.8%). T. nipponicus (2.1%), Chrysops suavis (1.2%) and Hy. borealis (0.9%). Hy. takahasii, a very rare species, was collected at Kamioboro and Kiritappu. Mass occurrence of Ha. tristis was observed at the forest areas of Kamioboro, Lake Notoro and Lake Chimikeppu.
