Presentation of such a detailed account of the Notodontidae of Borneo would not have been possible without the help of numerous organisations and individuals. My deepest thanks are due to all of them for their help.

The extensive freshly collected material available arose partly through the activities of the author under the auspices of the Royal Geographical Society - Sarawak Government Expedition and Survey of the Gunung Mulu National Park (1977-8), whilst financed by a Government Grant-in-Aid for Scientific Investigations administered by the Royal Society, and on a previous expedition (1965) to G. Kinabalu. Another large part of this material was accumulated and prepared by Lt. Col. M. G. Allen and Mr T. W. Harman during a series of expeditions in Brunei. Lt. Col. Allen also sent the author interesting and relevant material from Nepal.

The taxonomic work was undertaken at the British Museum (Natural History) with the permission of the Trustees and with the assistance and support of the Department of Entomology, particularly the Macrolepidoptera Section; Mr J. N. Downs of the Photographic Unit prepared the colour plates.

Type material of several species was examined on loan through the kindness of Dr M. C. Birch (University Museum, Oxford), Dr R. de Jong (Rijksmuseum van Natuurlijke Historie, Leiden) and Dr R. W. Poole (United States National Museum).

Dr M. Bascombe and Ms A. Fox generously made available unpublished data on the early stages of several species. The latter and Mr J.S.H. Skrine kindly acted as couriers for parts of the manuscript and artwork to Kuala Lumpur.

Finally I am extremely grateful to Mr H. S. Barlow for his assistance in this publication and in helping to finance the production so it could include colour plates.

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