Glaresis thiniensis new species is described from material collected at light in littoral sand dunes from eastern Iberian Peninsula. A new record of the other known Iberian species of Glaresis Erichson, G. hispana (Báguena), is provided. Diagnostic characters of both species include the presence/absence of mesotibial fossa in the metasternum, the form of the clypeus and meso- and metatibia, the number and size of teeth on the metatrochanter and femora and the form of male genitalia. These characters and others as the form of mandibles, length of metatarsomers, and the form of outer horseshoe-shaped portion of metatibia can be used to separate G. thiniensis from the North African species: G. mandibularis Petrovitz, G. tripolitana Petrovitz, G. carthagensis Petrovitz, G. pardoi Petrovitz and G. mauritanica Petrovitz. A map with the known distribution of the Iberian species is also provided.