Studies on the ectoparasites infesting rats were carried out in Narashino District, especially in and around the campus of Juntendo University, Chiba Prefecture.25 Rattus rattus alexandrinus and 12 Rattus norvegicus were collected by snap traps. As listed on Table 2 and 3, 6 genera, 8 species of blood sucking or/and parasitic mites, 3 families and 3 genera of free living mites, two genera, two species of blood sucking lice, and two genera, two species of fleas were identified.413 specimens out of total 525 specimens were removed from domestic rats, R. r. alexandrinus and 262 specimens of those were found on the rats collected in the dormitory and other buildings in the campus. One female specimen of Cheletomorpha lepidopterorum, the free living mite, collected during these studies is a new record of distribution in Japan.These results show us the fact that rodent and insect control should be urgently carried out.
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