Tesh, R. B., B. N. Chaniotis and K. M. Johnson (Middle America Research Unit, Box 2011, Balboa Heights, Canal Zone). Vesicular stomatitis virus, Indiana serotype: Multiplication in and transmission by experimentally infected phlebotomine sandflies (Lutzomyia trapidoi). Amer J Epidem 93: 491–495, 1971.—Wild-caught Lutzomyia trapidoi were infected with the Indiana serotype of vesicular stomatitis virus after feeding on viremic infant hamsters. Virus liters increased rapidly in infected sandflies, and VSV transmission by bite was demonstrated as early as three days after the infective blood meal. The possible role of this sandfty species in the natural transmission of VSV-lndiana is discussed.