PROC. BIOL. SOC. WASH. 94(3), 1981, pp. 731-738 A NEW GREGGELIX (MOLLUSCA: PULMONATA: HELMINTHOGLYPTIDAE) FROM BAJA CALIFORNIA SUR, MEXICO Walter B. Miller Abstract. — A new species of the pulmonate land snail genus Greggelix, G. punctata, is described from Baja California Sur, Mexico. Relationships within the genus are discussed. The malacofauna of Baja California exhibits sharply distinct regional di-visions (Miller, 1973; Christensen, 1979). The south-central, montane, mid-section of the peninsula is relatively inaccessible and malacologically unex-plored, but those portions that have been explored show characteristically a typical association of 4 genera of large land snails, namely the bulimulids Berendtia Crosse and Fischer, 1869, Spartocentrum Dall, 1895, and Rab-dotus Albers, 1850, and the helminthoglyptid Greggelix W. B. Miller, 1972. In July 1971, while examining specimens of Greggelix in the collection of the U.S. National Museum, I noticed one lot (USNM 190288) of 6 shells labelled ''Sonorella'' loefiri, whose sculpture was radically different from that of typical loehri. Instead of the usual dense granulations of G. loehri, the sculpture consisted of regularly spaced, punctate papillae arranged in parallel, descending rows. The lot had been collected by Nelson and Gold-man on 30 October 1905, and the locality was Hsted as "Guajadanni," which is currently spelled Guajademi. This lot indicated that yet another unde-scribed species of Greggelix might inhabit the mid-section of the Sierra de la Giganta. Accordingly, in October 1972, my graduate students Carl C. Christensen, Peter N. D'Eliscu, David B. Richman, and Richard L. Reeder, and I, ac-companied by a visiting Belgian entomologist, Charles Caspar, set out to explore the mid-section of the Sierra de la Giganta immediately west of Mulege. We drove westerly on winding desert roads along the Rio Mulege Valley, past a ranch named El Potrero, until we came to the end of the road at the foot of the escarpment which forms the east wall of the Sierra de la Giganta. A small ranch, located there, is aptly named Pie de la Cueta. From there, a trail led over the mountains to the Guajademi ranch, on the Pacific side of the range, about 5 kilometers from Pie de la Cueta. We explored several rockslides along the trail, on the Gulf slope as well as on the Pacific slope, and we found the typical associations of the 4 genera of large land snails mentioned above. The bulimulid species were the well-
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