Abstract
Three new species of an exclusively subterranean amphipod genus, which are the 1st records of hypogean amphipods in Colorado [USA], are described. S. coloradensis sp. nov. and S. pennaki sp. nov. were taken from the hyporheic zone of the North Fork of the South Platte River in central Colorado. S. holsingeri sp. nov. was collected near the source of a small spring in northern Colorado.

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