Abstract
From June to October, 1959, fly-surveys were made in three places of Ibaraki Prefecture, Dejima, Tsuchiura and Daigo with regard to the fly-fauna bred from the livestock bed of cattle barns and pig pens. Flies taken from pens and the same from houses were also compared. The flies emerged out from three cattle barns and two pig pens were classified into 7 families, 13 genera and 17 species. The majority of them were the species of public health importance. The dominant family was the Muscidae. Stomoxys calcitrans was the most dominant in number and Musca vicina was the next. It was observed that in autumn there was a noticeable rise in number of M. vicina and S. calcitrans emerging out from the livestock bed. S. calcitrans was the major constituent (75%) of fly-fauna in animal pens, whereas most of flies taken by traps set in houses were M. vicina.
