Neoalticomerus formosus new for the fauna of the Netherlands (Diptera: Odiniidae)

Odiniidae are small acalyptrate flies represented by three genera in Europe and one in the Netherlands. Here we add Neoalticomerus/ormosus to the Dutch fauna, a representative of a new genus. The species was caught by a Malaise trap on the island of Rottumerplaat, an atypical habitat for Odiniidae. Neoalticomerus formosus can be separated from Odinia because it has only four dorsocentral bristles. The absence of an intra-alar stripe is the main feature to separate it from its sibling species. Although no larval habits are known, they are presumed to be dependent on dead wood for their development. Neoalticomerus formosus is widely distributed in Europe and the Palaearctic region, but probably disproportionately rarely recorded due to its biology