In order to be acquainted with the kind of flies in Yonago district, I classified them which were caught on the dumping ground near the students dining-room, for a year. The total number was 13371, made up as under : Musca spp. 12360 92.4% Lucilia spp. 504 3.8% Sarcophaga spp. 471 3.5% Calliphora spp. 36 0.3%