Abstract
The flies occurring from dungs of the wild brown bear, Ursus arctos yesoensis Lydekker, were investigated in Hokkaido from 1976 to 1978. The following ten species were reared from 14 dungs collected in mountainous areas : Lasiomma octoguttatum (Zetterstedt), L. iwasai Suwa, Pyrellia tateyamensis Shinonaga, Mesembrina resplendens Wahlberg, Helina deleta (Stein), Mydaea sp., Fannia canicularis (Linnaeus), Fannia sp., Sepsis monostigma Thomson and Sargus metallinus Fabricius. The first three species were predominant in number among flies reared.
