The ecological energetics of the willow aphid Tuberolachnus salignus (Gmelin). J. D. Thomas and M. Benjamin. The effects of population density on growth and reproduction of Biomphalaria glabrata (Say) (Gasteropoda: Pulmonata). A. Sasekumar. Distribution of macrofauna on a Malayan mangrove shore. J. F.Benson. Population dynamics of Bracon hebetor Say (Hymenoptera: Braconidae) and Ephestia cautella (Walker) (Lepidoptera: Phycitidae) in a laboratory ecosystem. T. G. Wood. The distribution of

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... orms (Megascolecidae) in relation to soils, vegetation and altitude on the slopes of Mt Kosciusko, Australia. R. A. Cheke. Experiments on the effect of host spatial distribution on the numerical response of parasitoids. Graham Bell. The reduction of morphological variation in natural populations of smooth newt larvae. T. Lewis, G. V. Pollard and G. C. Dibley. Rhythmic foraging in the leaf-cutting ant Alia cephalotes (L.) (Hymenoptera). T. Lewis, G. V. Pollard and G. C. Dibley. Micro-environmental factors affecting diel patterns of foraging in the leaf-cutting ant Atta cephalotes (L.) (Hymenoptera). J. M. Harman and A. L. Turnbull. The interaction of spatial heterogeneity, predator competition and the functional response to prey density in a laboratory system of wolf spiders (Araneae: Lycosidae) and fruit flies (Diptera: Drosophilidae). B. D. Turner and E. Broadhead. The diversity and distribution of psocid populations on Mangifera indica L. in Jamaica and their relationship to altitude and micro-epiphyte diversity. S. D. VVratten. Aggregation in the birch aphid Euceraphis punctipennis (Zett.) in relation to food quality. M. A. Learner and D. W. B. Potter. Life-history and production of the leech Helobdella stagnalis (L.) (Hirudinea) in a shallow eutrophic reservoir in South Wales. M. R. K. Lambert. Observations on the feeding activity of the Australian plague locust Chortoicetes terminifera (Walker) in field populations in eastern Australia. L. R. Taylor. Insect migration, flight periodicity and the boundary layer. D. J. Rogers and M. P. Hassell. General models for insect parasite and predator searching behaviour. RtviEWs; SHORT NOTICES ABSTRACTS