dispar becomes the prey of a certain spider, hanging from its web. 

 According to Dr. D. Sharp, horse-flies are also a favorite food of the 

 fossorial wasps of the family Bewbecidae, but I have no such record 

 from our Islands up to date ; while in the Island of Oshima (Kagoshima- 

 Ken) t met in this summer the fact that many of Vespa japomca, 

 Sauss., were hunting the females of T. okinawanns, some oi them being 

 eaten their head, wings or abdomen. 



We have, up to the time, no parasitic Hymenoptera of the eggs 

 of horse-flies, there are two, however, found in other countries, Phanurus 

 tabanivorus, Ash., in Illinois, and Phanurus (Telenomus) tabani, Mayr., 

 in Austria. 



The genera and species of Tabanidae occuring in Japan includ- 

 ing Formosa and Sakhalin, are as shown in the following table : 



