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A new species of Paracrobeles, P. kelsodunensis sp. nov. is described from the Kelso Dunes area, Mojave National Preserve, southern California. Paracrobeles kelsodunensis sp. nov. is particularly characterised by a body length of 469-626 mu m in females and 463-569 mu m in males; lateral field with four incisures, extending almost to tail terminus; three pairs of asymmetrical lips, separated by U-shaped primary axils with two long guarding processes, each lip usually with four tines along its margin; three long labial probolae, deeply bifurcated, with slender prongs without tines; metastegostom with a strong anteriorly directed dorsal tooth; pharyngeal corpus anteriorly spindle-shaped, posteriorly elongate bulbous with dilated lumen; spermatheca 24-87 mu m long; postvulval uterine sac 60-133 mu m long; vulva in a sunken area; spicules 33-38 mu m long; and male tail with a 5-8 mu m long mucro. The generic diagnosis is emended on the basis of recently described species and a key to the species of Paracrobeles is provided.