This volume represents the sixth and seventh parts of the series I have undertaken as a Scientific Associate of the Natural History Museum, with access to collections, libraries and with working space and facilities provided in the Department of Entomology. I am grateful also for continued use of a microscope on loan from the International Institute of Entomology (IIE; now part of CABI Bioscience). The work, particularly that on the higher classification, has been providing a taxonomic context for ongoing ecological projects in Papua New Guinea (see p. 37), and has had a contribution of technical support time therefrom through the Smithsonian Institution.

I have enjoyed the support of a part-time research assistant, Shayleen James, generously funded by The Friends of the Natural History Museum. Support from her predecessor, Maia Vaswani, has also continued intermittently in NHM alongside that of Shayleen through the generosity of Henry Barlow. He is currently funding Maia, now in France, to prepare a database for a general index and bibliography for the series. Both Maia and Shayleen have undertaken a considerable amount of literature research, dissection, text keyboarding, checking and help with preparation of the figures; Shayleen provided the artwork for Figs 1 and 2, and produced and assembled digital images of the genitalia using a Nikon Super Coolscan 44000EDTM and Adobe Photoshop 7.0TM. Much support in seeing the series through to publication in Malaysia continues to be provided by Henry Barlow, and this volume is published in conjunction with the Malaysian Nature Society. The colour plate images were prepared by Phil Hurst and Harry Taylor of the NHM Photographic Unit. I am very grateful to my wife, Phillipa, for keyboarding, the production of camera-ready copy for text and figure legends, and for helping edit the images for the genitalia figures. Mr Hok Kim Loong provided the images of larvae for Plate 28.

The work would have been impossible without the full access, mentioned above, to the collections and other facilities in The Natural History Museum, London. Material was also examined in, or from, the United States National Museum, Washington, Nationaal Natuurhistorisch Museum, Leiden, the University Museum, Oxford, the Museum fur Naturkunde, Berlin, the Museo Civico di Zoologia, Rome, the H.S. Barlow collection, the Forest Research Centre collection, Sepilok and the FRIM collection, Kepong. I am grateful to the staff of all the above institutions for their assistance. The host records mentioned in previous parts are now almost entirely recorded by Robinson
et al. (2001), but some additional data are noted in the text, particularly those accumulated by Vojtech Novotný, Scott Miller and an energetic team of parataxonomists in Papua New Guinea (see above).

Thanks are also due to Henry Barlow, Ted Edwards, Michael Fibiger, Tony Galsworthy, Harish Gaonkar, Martin Honey, Hiroshi Inoue, Ian Kitching, Lutz Kobes, Vladimir Kononenko, Martin Lödl, Geoff Martin, Wolfgang Nässig, John Rawlins, Gaden Robinson, Gabor and Laszlo Ronkay, Wolfgang Speidel, Shin-Ichi Yoshimatsu and Alberto Zilli for advice, information, discussions and comments on parts or all of the text. As indicated on p. 36, a few of the genera covered here are being investigated more fully in collaboration with Alberto Zilli and, for some of them, Willem Hogenes.

In naming new species in the genera Diomea and Chorsia, I have continued to pay tribute to those teachers (alas, many now deceased) at Bryanston School who were my mentors during my time there, having originally named one (Holloway, 1976) after G.D. Harthan, one of my tutors and biology teachers.

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