Rattus norvegicus (Berkenhout)
Synonymy.—Mus decumanus; Epimys norvegicus.
Natural prey.—Leucophaea maderae, Venezuela (Brumpt, 1931): Rats infested with Protospirura bonnei presumably ate this cockroach which is the intermediate host of the worm.
Periplaneta americana, Brazil (Magalhães, 1898): Remains found in the stomachs of brown rats. Denmark (Fibiger and Ditlevsen, 1914): This cockroach was found to be the intermediate host of Gongylonema neoplasticum, a parasite of rats.