The latest information on the day-flying moths project is given. Just like the butterflies, the number of day-flying moths in the Netherlands is declining. Monitoring and comparison of the numbers of species before and after 1990 show that the situation is serious. Of the 120 selected species of day-flying moths, 38% have decreased drastically since 1990. These include Hepialus humuli, Eupithecia pygmaeata and Celaena haworthii. A further 49% have decreased to a lesser extent and for 8% there is no change. Since 1990 only 5% of the species have increased, among them Tyria jacobaeae.