The scale of measurement given in descriptions of new species is from the centre of the thorax to the forewing apex.

Information on habitat preference has been gained almost entirely from light trap surveys of G. Kinabalu (Holloway, 1976), the G. Mulu National Park (Holloway, 1984a, 1989), from collections made by Col. M.G. Allen and colleagues in Brunei, by W. Boyd-Wallis in Kalimantan and by A.H. Kirk-Spriggs and Dr S.J. Willott in Sabah. Additional data on the fauna of softwood plantations and material from the Forest Research Centre Collection, Sepilok, have kindly been made available by Dr Chey Vun Khen of the Sabah Forest Department (Chey, 1994). Similar data for Peninsular Malaysia have been made available by the Forest Research Institute of Malaysia (FRIM). Some additional records were made in March, 1997, from sampling during the International Pilot Course on Environmental Evaluation using Insects as Indicators held at Universiti Malaysia Sabah: geometrids were used as one indicator group. Broad vegetation categories were discussed in Part 4 of this series.

Data on geographical range are mainly from the collections of The Natural History Museum (BMNH), but with some additional data on the Sumatran fauna that have been made available through the collecting activities of Dr E. Diehl and other members of the Heterocera Sumatrana Society. Data for Peninsular Malaysia are supplemented from the collections of Mr H.S. Barlow and FRIM, the latter particularly through recent surveys conducted by Dr J. Intachat, and those for the Philippines from the collection of Mr C. Treadaway. Recent publications on the fauna of Nepal (Yazaki, 1992, 1993, 1994, 1995) have also been a valuable source.

Many host-plant data are drawn from unpublished records of the International Institute of Entomology. These are collated from material submitted to the Institute for identification from throughout the Indo Australian tropics. Of particular note in recent years are records from material submitted by the Indian Central Agricultural Research Institute station in the Andaman Is. Plant nomenclature follows Mabberley (1987).

Holotypes of new taxa have been deposited in The Natural History Museum except where indicated to the contrary.

Nomenclatural details of all genus-group names are to be found in Fletcher (1979), and are therefore not repeated here. Fletcher did not indicate generic gender. Whilst the Code of Zoological Nomenclature stipulates that adjectival species-group names should agree in gender with the genus-group name, the application of this in the Geometridae is fraught with difficulty (Holloway, 1993 [4]). Given modern requirements for computerised database construction, and given the confusion that rectification would be likely to cause amongst users of biosystematics not familiar with the niceties of the Latin language, all species names given here have the orthography of the original description. The reader should also note that the convention of putting author names in parentheses, where the genus of combination is not the original one, has not been followed, as the situation is clear from the synonymy attached to each species treated.

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