In 1948 the host relationships of 81 mammals were observed, including 45 red foxes, 12 raccoons, 3 eastern skunks, 2 eastern cottontails, 2 meadow mice and 17 muskrats. The same 7 spp. of ticks found in 1946 and 1947 were found in 1948. Dermacentor variabilis was the predominant tick on each animal sp. except the eastern cottontail, on which Ixodes dentatus was more numerous. The eastern skunk and the red fox had the highest total avg. of D. variabilis per host. There was a greater incidence of P. variabilis and I. scapularis on animals captured east of the Shinnecock Canal. The peak abundance of D. variabilis on animals occurred during May and June.