In the course of studies of the tick and Rocky Mountain spotted fever problem on Long Is., N.Y., 275 mammals representing 16 spp., and 74 birds representing 26 spp., were taken and searched for ticks in 1946 and 1947. From these 349 animals, 2801 ticks, representing 7 spp., were collected: Dermacentor variabilis, Haemaphysalis leporis-palustris, Ixodes cookei, I. dentatus, I. muris. I. scapularis and I. marxi. In this survey, I. muris was recorded for the first time from longtailed shrew, gray squirrel, eastern cottontail, red fox, chipmunk, raccoon, skunk, Virginia deer, red-eyed towhee, catbird, eastern or American robin and brown thrasher. Also recorded for the first time was the larva of D. variabilis from the long-tailed shrew, I. scapularis from the eastern skunk, and H. leporis-palustris from the yellow-billed cuckoo and white-footed mouse. D. variabilis was the most common tick in collections made from the grass, but I. muris was the most prevalent on animals. The red fox was the most important host of adult D. variabilis.