This specimen keys out to Hypogastruridae in Borror, Triplehorn, and Johnson (1) based on the elongate body with 6 abdominal segments, well-developed thorax and dorsal bristles, dark-coloured body, and habitat (ie not on a pond, which would be Poduridae). This resembles the snow flea, Hypogastrura nivicola, based on the behaviour and appearance (see here and here for examples - there are also some neat SEM photos in a pdf here, although the text is in French). However, there are lots of species in this family and genus, and the NCSU collection does not have a specimen from that state - this species is so common where it occurs around here that probably means the species doesn't occur that far south. It could be something else in that genus or perhaps a different genus in the family.