EN
The studies have a long character. During the period from July 1, 1957 to April 1, 1958 the author examined a total number of 896 small mammals classified to Rodentia, Insectivora and Carnivora. The animals were caught in the Tomaszów district, in localities characterized by the great intensity of Swamp fever (Niemirówek, Rachanie and Machnów). During the examinations were classified and eiaborated all of the then collected fleas (1578 specimens), lice (1179 specimens) and ticks (466 specimens). The fleas belong to 14 species of which most numerous were: Ctenopsyllus segnis, Archaeopsylla erinacei, Ctenophthaimus assimilis and Megabothris walkeri. The rarer in Poland species were Ctenophthalmus wagneri?, Doratopsylla cuspis and Ctenopsyllus bidentatus. The lice were represented by 4 species: Hoplopleura acanthopus (mainly on Microtus arvalis and Microtus ratticeps), Hoplopleura longula (mainly on Mus musculus), Polyplax spinulosa (exclusively on Rattus norvegicus) and Polyplax serrata (on Apodemus silvaticus and Apodemus agrarius). Out of the 4 species of the ticks the most common was Ixodes ricinus, the 3 remaining forms were hitherto not recordet in Poland. They were: Ixodes hexagonus (on a hedge-hog, polecat and mouse), Ixodes ex gr. autmnnalis (on a hedge-hog) and Ixodes apronophorus (on Microtus ratticeps).