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Department of Biological Sciences, Texas Tech University, Lubbock, Texas 79409, U.S.A.

(Received 10 August 1974)

Effects of androgens on specialized scent glands (sebaceous type) have been described for a few species of rodents: hamsters (Hamilton & Montagna, 1950), guinea-pigs (Martan, 1962), Mongolian gerbils (Glenn & Gray, 1965), and Prairie deer-mice (Blum, Kakihana & Kessler, 1971; Doty & Kart, 1972). These studies have all shown that the sebaceous glands have a direct androgen dependence for growth and maintenance. This paper reports this androgen-dependent phenomenon in another species, the eastern wood rat, Neotoma floridana. This rat has a specialized mid-ventral gland that is much more pronounced in males during the breeding season than in females (Rainey, 1956; Spencer, 1968).

To determine the relationship between testicular weights and glandular area (length x width), 15 male rats (ranging in weight from 17–441 g) were castrated. Weight, length, and width of the testes were recorded,