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in size (0.5 to 1.2 mm), the North and Central European fauna has been extensively studied. Especially the largest and most difficult genus Acrotrichis Motschulsky, 1848 attracted the attention of some skilled coleopterists. As a result several revisionary studies treating this genus were published during the last century (Roßkothen 1934, 1935, Renkonen 1939, Strand 1941, Sundt 1958, 1971, Mĺynarski 1984, Sörensson 1988). Many of these publications present accurate figures of male and especially female genitalia that are being used as essential characters for the separation of the often similar species. In addition, the Acrotrichis-fauna of several other geographic regions has been treated in the past decades (Sundt 1969, Johnson 1969, 1984, 1985, 1988, Sawada & Hirowatari 2002). Thus, we were surprised to discover an unknown species of Acrotrichis in Northwest Europe. A single male collected in 1988 and another collected in 1997 aroused our suspicion, although they first were taken for aberrant specimens of A. dispar (Matthews, 1865). Only after the recent collection of additional material, including a large unmixed series (10 males and 12 females) of the new species, its true status became evident. Males can easily be separated by primary and secondary sexual characters. No reliable characters separating the females of both species could be detected. Most material was collected in the course of an extensive study on the entomofauna of large carcasses carried out at National Park ‘Veluwezoom’ in the Netherlands. The focus in this study was on Diptera and Coleoptera. The latter were collected from samples taken by sieving the soil impregnated by body fluids from the carcasses. This habitat proved to be particularly rich in ptiliid beetles. Twenty-eight samples yielded more than 1800 specimens belonging to 24 different species. These represent almost half of the Dutch ptiliid fauna, which until now comprised 48 species (Brakman 1966, Huijbregts & Krikken 1988, Vorst & Huijbregts 2001a, 2001b). A single specimen was caught by ‘Autokätscher’ (car net) on the Baltic island of Öland while the second Swedish specimen was found in mouldy grass compost. As the newly discovered species is very similar to A. dispar, current synonyms of the latter potentially refer to this species. The last world catalogue of

On the identity of Acrotrichis nana Strand, a species distinct from A. dispar (Matthews) (Coleoptera: Ptiliidae)