This monograph is the ninth to be published in a series planned on the Bornean 'macrolepidoptera' superfamilies Cossoidea, Zygaenoidea, Bombycoidea (including Sphingidae), Noctuoidea, Geometroidea, Calliduloidea and Castnioidea. Parts will appear over the next few years as regularly as the vagaries of life permit. The parts printed and dates of publication so far are shown on the back cover.

Its publication represents the half-way point in the series and brings the number of species covered to just over 2000. The information contained can be evaluated by considering that a species identification undertaken at The Natural History Museum would cost at least 50. Hence the parts so far published represent an information value of 100,000 or 400,000 Malaysian ringgit for every complete set.

The author is in frequent communication with the Heterocera Sumatrana team organised by Dr E.W. Diehl, and the two series of publications complement each other to provide, for the first time, fully illustrated reference works to a large proportion (25% in the case of the Geometridae) of the very rich South East Asian and Sundanian macrolepidoptera fauna.

The series is based on a large amount of recently collected material that gives some indication of habitat preference for the species concerned. Data on early stages and host-plants are being collated and reviewed.

Literature on the Oriental fauna is voluminous but often without illustrations and with poor, superficial descriptions. Synonymy presented often proves to be erroneous. Generic placements and higher classification are often found to be similarly superficial on close examination. This problem is dealt with more fully in the author's introduction for his Taxonomic Appendix to H.S. Barlow's An Introduction to the Moths of South East Asia. This series on the moths of Borneo is seen as an opportunity to establish a fresh, more stable foundation for the study of the Indo-Australian tropical macrolepidoptera, an opportunity facilitated by access to the wealth of historical material held in The Natural History Museum, London, and other European Museums. The centralisation of this material is a boon for the comparative studies necessary to provide the stable foundation just referred to.

The reader must be prepared, however, for major changes to previously acepted generic, or even subfamilial placements. For example, in this part, the many Sterrhine species previously placed in Anisodes are distributed amongst other genera, and stricter definition of the larentiine genus Chloroclystis has a similar result.

As the series is completed it may be revised and reissued in three or four bound volumes as a complete reference work. A field guide incorporating the colour plates is also being considered.

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