A new troglomorphic species of Larca (Pseudoscorpiones, Larcidae) from Colorado.

A new species of Larca is described from dry habitats in a cave in central Colorado. Like other cave-dwelling species of Larca , the new species Larcaboulderica sp. nov. , shows relatively modest morphological adaptations, such as pale colouration and slightly elongated appendages, compared with their epigean counterparts. This species is the sixth cave-dwelling species of Larca described from North America and, like other cave-dwelling Larca in North America and Europe, tends to be distributed in more southerly regions.