We present the first published records of Myrmecophilus fuscus Stalling, 2013 from the Spanish mainland. We observed the species at various localities in Catalonia and in the city of Madrid. Six ant species are known hosts for M. fuscus in mainland Spain: Camponotus lateralis (Olivier, 1792), Crematogaster scutellaris (Olivier, 1792) and Formica cunicularia Latreille, 1798, as well as three ant species of the genus Lasius, two native and one exotic: L. grandis Forel, 1909, L. cinereus Seifert, 1992, and the invasive L. neglectus Van Loon, Boomsma & Andrásfalvy, 1990.
- Myrmecophilus fuscus
- New records