Interchernes clarkorum, new genus and new species, is described from specimens found on a Yucca sp. in Baja California, Mexico. This form is unusual among pseudoscorpions in having a protuberance on the inside of the chelal hand in both male and female. The relations of the new genus to several other chernetid genera are discussed. Some pseudoscorpions found on Yucca appeared at first to represent an unusual new species of Dinocheirus. However, close examination revealed that in fact they belong to a different genus, hitherto unrecognized. Interchemes, new genus Type species: Interchernes clarkorum, new species. Diagnosis: The new genus is intermediate in characters among several other chernetid genera. It is much like Dinocheirus Chamberlin (1929) and Mirochernes Beier (1930) in its size and general conformation, and in the chaetotaxy of the chelicera and palpal chela; it is similar to Epactiochernes Muchmore (1974b) in the size and position of the tactile seta on tarsus IV (and in the chaetotaxy of the chelicera and chela); it is similar to Dendrochernes Beier (1932) in the nature of both male and female genitalia; and it is similar to Mirochernes and Bituberochernes Muchmore (1974a) in the occurrence of a distinct protuberance on the medial side of the chelal hand. Specifically, it may be characterized as follows: A genus of the family Chernetidae. Body moderately stout; appendages fairly long. All parts heavily sclerotized; carapace and palps covered with fine granules; legs scaly. Carapace with two deep transverse furrows; all typical tergites and sternites divided, except 11th; pleural membranes longitudinally hispidostriate. Dorsal setae short but narrow and terminally ·denticulate; ventral setae acuminate or paucidenticulate. Chelicera with flagellum of 4 setae; hand with 5 setae, sb finely denticulate, others acuminate, es short; galea of female large and well branched; that of male short, with tiny spinules. Palps moderately robust; chela heavy in both sexes, and with a small, but prominent conical protuberance on the medial side of the hand toward the