| Summary: | The chromosomes of wild rats are poorly investigated. Most
studies have been confined to Rattus norvegicus albino, most recently reviewed by Robinson (1965). Makino (1942, 1943) studied the chromosomes of 5 species of Asiatic rats with old testis-section methods-R. norvegicus, R. rattus, R. losea, R. fulvescens coxinga, and R. confucianus culturatus. Recently, Huang (1968) studied the chromosomes of Rattus (Mastomys) natalensis from Africa, and Yong (1968a) reported the karyotypes of 4 Malayan rats-R. bowersii, R. muelleri, R. edwardsi, and R. sabanus.The present paper deals with the chromosomes of 3 species of
Asiatic rats, Rattus rattus sladeni (Anderson) and Rattus
huang (Bonhote) from Hong Kong, and Rattus berdmorei (Blyth) from Thailand.
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