A new species of the genus Pericompsus Le Conte (Coleoptera: Carabidae: Bembidiini) is described from Catamarca province, Argentina. It is found along the borders of rivers and creeks in this arid region of western Argentina. The morphological characters of the new species place it within the subgenus Pericompsus (Pericompsus), and allow its recognition as a new species of the hirsutus species group. The discovery of this species extends the geographical range of the hirsutus group to the parallel 27° South. A description and illustration of the new species, together with a key to differentiate it from other hirsutus group species are provide.