Sprinkhanen en krekels: Summary

THE ORTHOPTERA OF THE NETHERLANDS From 1990 until 1994 more than 100 recorders participated in the collection of distributional data of Orthoptera in The Netherlands. In this book we present the results of this mapping scheme. The Dutch fauna comprises to date 45 indigenous species, four of which have become extinct during this century, viz.: Psophus stridulus (last seen in 1942), Locusta migratoria (1951), Tetrix bipunctata (1975), and Gampsocleis glabra (1987). By contrast three species were found for the first time during this project: Conocephalus discolor (in 1990), Tettigonia cantans (in 1992) and Meconema meridionale (in 1993). Other species such as Phaneroptera falcata, Chorthippus apricarius and C. mollis are markedly expanding their range within our country. This book describes the problems and successes of these species in our country, their biologies, their songs. The songs are also presented as digital recordings on the accompanying cd. Furthermore the book gives information on nature conservation issues and provides management advice, which should ameliorate the situation for Orthoptera.