The presence of Trichopterapion holosericeum in Switzerland is confirmed ater the first record of the species 117 years ago. One specimen of this species was found in April 2003 in the south of the Canton Ticino in a "Kombi trap" (window trap combined with a yellow pan) during a study of the WSL Sottostazione Sud delle Alpi on the influence of coppicing on biodiversity in a 60 years old coppice stand of chestnut forest (Castanea sativa). The first doubtful record of T. holosericeum from the Geneva region in 1888 remains doubtful, since records of the species in France are only known from the department Var 300 km further south.