I am very grateful to many of my colleagues in the Department of Entomology at The Natural History Museum, London who collected material with or for me. In particular I thank John Chainey, Jenny Spence and my wife Linda Pitkin.

I am grateful to David and Diane Henshaw, Michael von Tschirnhaus and the late Kenneth Spencer and for much interesting and informative discussion on Agromyzidae; to Mike Ackland for providing additional data on Anthomyiidae; to Ian White for interesting and informative discussion on Tephritidae; and to Paul Beuk who confirmed the identity of the leaf-mining Drosophilidae on which many of the host records of this family are based. Any errors or ommissions, however, are entirely my responsibility.

I am grateful to Willem Ellis for permission to reproduce many images of leaf-mines from his Nederlandse bladmineerders website.

I am grateful to Rob Edmunds for permission to reproduce the images of mines of Phytomyza bipunctata on Echinops sp. and Chromatomyia periclymeni on Lonicera from the British Leafminers website.

I am grateful to Dominique Collins, Central Science Laboratory, DEFRA for permission to use images of mines of Liriomyza species taken by Paul Seymour and for his generous help with information on the hosts of the polyphagous pest species of Liriomyza.

I am grateful to Stephen Compton for drawing my attention to the published records of Chromatomyia horticola and Scaptomyza flava on Coincya wrightii - Lundy Cabbage.

I am grateful to my colleagues Marion Stafford and Alison Paul of the Museum's Botany Department who identified (or verified my tentative identifications) of some of the host-plants.

I am grateful to my colleague John Noyes who made his Universal Chalcidoid Database available as a Paradox database, which enabled me to extract lists of all British Chalcidoids and their British dipterous leaf- and stem-mining hosts tocreate the hyperlinks to his excellent online database.

The Professor Hering Memorial Fund, administered by The British Entomological and Natural History Society, kindly provided funds to purchase film in the early stages of the project.

To all I extend my grateful thanks.

Brian Pitkin