Abstract
An investigation on the trombiculid mites in the area was carried out during the period from November, 1959 to October, 1960. Numbers of host animals of the trombiculid mites were 307 of Apodemus speciosus, 12 of Microtus montebelli, 4 of Urotrichus talpoides, 21 of Rattus norvegicus, 1 of Rattus rattus and 8 bird. 11, 691 trombiculid mites were collected, which belong to 6 genera including 15 species. Apodemus speciosus was infested by the most parasites. There were more mites infested per each hosts lived in the area of the underbrush and the bamboo thicket than in the grass-land. Trombicula fuji, T. kitasatoi, T. kuroshio and Gahrliepia saduski were collected in every month of the year. The most dominant species is T. pallida, of which nevertheless none was collected in August. T. hazatoi was collected from Apodemus speciosus, which is the first report from the host.
