This work was undertaken partly as a research programme of the International Institute of Entomology (IIE), partly in leisure time and on unpaid leave and partly in the process of providing taxonomic support for Jurie Intachat's (Forest Research Institute of Malaysia: FRIM) research programme within the FRIM Regional Forestry Research programme with funds provided by the British Overseas Development Administration.

Considerable support for publication of The Moths of Borneo series continues to be provided by Henry Barlow.

I am very grateful to my wife, Phillipa, for the long hours she put in at the keyboard to produce camera-ready copy for the text and figure legends, and to Locomotive Software for the use of their equipment and materials.

The colour plates of moths were photographed by Bernard D'Abrera, and those of the larvae by Mike Bascombe and David Preston. The half tone figures were produced with the assistance of Graham duHeaume.

The work would have been impossible without full access to the collections of The Natural History Museum, London. Material was also examined in, or from, the Australian National Insect Collection, Canberra, the Senckenberg Museum, Frankfurt, the U.S. National Museum of Natural History, Washington, the B.P. Bishop Museum, Honolulu, the University Museum, Oxford, the National Museum of Wales, Cardiff, the Royal Scottish Museum, Edinburgh, the Forest Research Centre Collection, Sepilok, and the FRIM collection, Kepong. I am grateful to the staff of all these institutions for their assistance, and for Chey Vun Khen and Jurie Intachat of the last two for access to unpublished host records. Such records were also gleaned from data taken from material submitted to IIE over the years for identification (See Introduction). John Rawlins kindly provided me with a translation of host-plant data in Inoue et al. (1982). Mike Bascombe provided host data from Hong Kong.

I have enjoyed close collaboration with Geometridae specialists associated with the Heterocera Sumatrana Society, notably Rikio Sato, Manfred Sommerer and Dieter Stüning, resulting in a liberal exchange of key information and useful critiques of various drafts of the text. Thanks are also due to the following for their critical comments on all or part of the text: Douglas Ferguson, Martin Krüger, Malcolm Scoble, Jason Weintraub and Katsumi Yasaki. The work also benefited from discussions held at various times with Hans Bänziger, David Carter, Chey Vun Khen, Mark Cook, Steve Fletcher, M. Claude Herbulot (who also kindly loaned or donated Bornean material from his collection). Hiroshi Inoue, Peter McQuillan, Linda Pitkin, John Rawlins and Colin Treadaway.

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