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Dear Obonaj
It is Metriocnemus alright and besides the dark posterior claws it resembles M. cavicola very much. M. cavicola is supposed to have yellow claws. For the nomenclature I have asked a dutch expert on this matter (H. Moller) and he says : "...the nomenclature of these species (M. eurynotus/cavicola) is the most problematic in all the larval literature. M. eurynotus are 2 species (probably unidentifyable as an adult)". I think it is save to name it cf. cavicola or cavicola group or something like that.