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M. Webb (London, UK), and CM.Yang (Singapore).We are grateful to the Library of National Museum of Natural History (Leiden, The Netherlands) and the Library of The Netherlands Entomological Society, especially to G. Tweehuysen and R. van Kampen (Amsterdam, The Netherlands), for helping with literature requests which always consisted oElong lists of journal volumes; and to W. Hogenes (Amsterdam, The Netherlands), D.A. Polhemus (Washington DC, USA) & CM.Yang (Singapore) for helping with some publications on the fauna of continental Malaysia.We appreciate the discussion with J. T. Polhemus and D.A. Polhemus on some taxonomic problems.Also, they made a part of one of their manuscripts on Naucoridae available to us.We thank 1. Cheng (La Jolla, USA) for her generous offering of important data on the genus Halobates, and also for reading the text on Halobatinae and giving useful comments.We thank The Royal Society of South Australia for permission to use illustrations no. 121, 127and 157, which were originally published in the Transactions of the Royal Society of Australia.We acknowledge deeply the help from Dr. G. Thirumalai (Chennai, India) and Dr. A. Bal (Calcutta, India) for confirming the situation of the type ofVentidius distanti Paiva, deposited in the Zoological Survey ofIndia