A directory of tropical research sites where British ecologists, incl. undergraduate students, would be positively welcomed has been prepared by Dr. A.G. Marshall, Department of Zoology, University of Aberdeen, Aberdeen AB9 2UD, Scotland, U.K. The aim is: a) to assist ecologists to find a suitable site for research, b) to help those running ecological stations in the tropics to find suitable workers to assist in the maintenance of these stations. He has information on 30 sites in 24 countries. Information on each site is available in the form of a two A4-page questionnaire.