C. breviantennella n.sp. is described and figured from material collected in the northernmost parts of Sweden, Finland and the Kola Peninsula. Earlier is has been mistaken for Adela rufifrontella Tr. from which it easily is separated by its genitalia. C. brunnella n.sp. is known from its holotype only. Superficially it resembles C. leucocerella and albiantennella. A synonymic check list of the Palaearctic species currently referred to Cauchas is given and two new combinations are established, Nemophora canalella (Eversmann) and Nemophora infantella (Erschoff).