Gnathotrichus materiarius (Fitch, 1858) is an alien species in the European fauna. In Poland, this species has not been recorded thus far, although it was assumed that it may be present. This paper presents the first site of G. materiarius in Poland. A single individual of the beetle was captured during monitoring activities of the Double-spined bark beetle – Ips duplicatus (Sahlb.) in the pheromone traps with ID Ecolure pheromone in the Kamienna Góra Forest District, Krzeszów forest circle. Selected aspects of this species’ ecology in the European conditions were discussed: capturing of Double-spined bark beetles in pheromone traps intended for various coniferous tree bark beetles, species’ low count, possibility of the presence of two generations in one season and vertical distribution at various heights above sea level.

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