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Macleod, A., Wratten, S. D. and Harwood, R. W. J. (1994): The efficiency of a new lightweight suction sampler for sampling aphids and their predators in arable land. Ann. appl. Biol. 124: 11-17. Samu, F. and Sárospataki, M. (1995): Estimation of population sizes and home ranges of polyphagous predators in alfalfa using mark-recapture: an exploratory study. - Acta Jutlandica (in press). Southwood, T. R. E. (1966): Ecological methods with particular reference to the study of insect populations. - Methuen, London, pp. 391. Southwood, T. R. E. and Pleasance, H. J. (1962): A hand-operated suction apparatus for the extraction of arthropods from grassland and similar habitats, with notes on other models. - Bull. ent. Res. 53: 125-128. Sunderland, K. D., De Snoo, G. R., Dinter, A., Hance, T., Helenius, J., Jepson, P., Kromp, B., Samu, F., Sotherton, N. W., Ulber, B. and Vangsgaard, C. (1995): Density estimation of arthropod predators in agroecosystems. - Acta Jutlandica (in press). Topping, C. J. and Sunderland, K. D. (1992): Limitations to the use of pitfall traps in ecological studies. -J. Appl. Ecol. 29: 485-491. (Received 21st April, 1995) Authors' addresses: Dr. Ferenc SAMU Plant Protection Institute Hungarian Academy of Sciences H-1525 Budapest, P.O. Box 102 HUNGARY Dr. Miklós SÁROSPATAKI Department of Zoology and Ecology Agricultural University of Gödöllő H-2103 Gödöllő, Páter Károly u. 1. HUNGARY