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sache in the Micos region of San Luis PotosI andfound a new genus and species of troglobitic cirolanidisopod (Bowman, 1975). Also during NovemberDavid McKenzie visited several caves in southernMexico, including Grutas de Atoyac, Veracruz, andGrutas del Cocona, Tabasco.The biological activities of the Association forMexican Cave Studies reached their highest levelduring 1972. David McKenzie visited several cavesin Yucatan in January. Among collections of interestwere additional specimens of the troglobitic spirostreptidOrthoporus zizicolens.On March 27-30 the Grupo Espeleologico Mexicanoconducted an expedition to the Huautla de Jimenezregion of Oaxaca, which was directed by Jorge Urquijo.In S6tano de San Agustin, Jesus HernandezLopez collected specimens of a new species of troglobiticcarabid beetle (Hendrichs and Bolivar, 1973).William Elliott, Pam Lynn, Mike McEachern, andRon Ralph continued the investigation of the karstregion of Valle de los Fantasmas, San Luis Potosi,in May 1972 with the exploration of several caves inthat area (Elliott and Reddell, 1973). In June studywas continued in the Pinal de Amoles rel,rion whennumerous new caves were located and explored byWilliam Russell, Terry Ibines, I{oll Ralph, and others.Discoveries included additional populations of blindtrechine beetles, spiders, millipeds, and isopods.Most of these results remain unpublished.Study of the cave fauna of northwestern Mexicowas resumed with a trip to this area on June 10-22,1972, by Ed Alexander, William Elliott, Carl Kunath,Anf.,rie McLaughlin, and James Reddell. Caveswere visited in the vieinities of Parral, Chihuahua, andlVlapimi and Picardias, Durango (Reddell, 1973c).Arnon~ the more signifieant diseoveries were additionalspeeimens of both species of reliet ricinuleidfrom Durango, a new species of troglobitic amphipod(Holsinger, 1(73), and a new species of leptonetidspider (Gertsch, 1974).During August 1972 Jerry Cooke, Rexell Mitchell,Robert \V. Mitchell, and William Russell visited eavesin Chiapas, Tabasco, and Yucatan. The fauna collectedincluded a new family, genus, and species oftroglobitic planarian (Dimarcus villalobosi), a newspecies of planarian of the genus Dugesia (l\'1itchelland Kawakatsu, 1973b), a new species of asellidisopod (Bowman, 1976), a new species of troglobiticpseudoscorpion (Muchmore, 1973a), and specimensof the blind crab Typhlopseudothelphusamocinoi from two additional localities.The intensive study of tile caves of the Pinal deAmoles region continued in November 1972 withexploration in several caves by Roy Jameson, PeterStrickland, and others. The area was also visited inDecember by Roy Jameson and others, at whichtime a collection in Cueva de Emilia resulted in thediscovery of the first troglobitic homopteran knownfrom Mexico (Fennah, 1973).Caves in the Sierra de EI Abra, Tamaulipas, andAquismon and XiJitia regions of San Luis Potosiwere visited November 21-29, 1972, by Jan Lewis,James Reddell, Terry Raines, Jack White, and others.The collections included new species of opilionid(Goodnight and Goodnight, 1973), pseudoscorpion(Muchmore, 1973c), and milliped (Causey, 1973).One of the more successful expeditions conductedby members of the Association for Mexican CaveStudies was that made from December 22, 1972, toJanuary 8, 1973, by David McKenzie, Martha HelenMcKenzie, Stuart Murphy, and James Reddell (Reddell,1973e). Caves were visited in the Sierra deTamauJipas, Tamaulipas; the Tezonapa region, Veracruz;and the Acatlan, Valle Nacional, San Sebastiande las Grutas, and Apoala regions of Oaxaca. Althoughmany undescribed species were found in allof the regions visited, the most productive were theTezonapa, Acatlan, and Valle Nacional regions. AtTezonapa collections included a new species of glomeridmilliped (Causey, 1973). The spectacular cavenear Acatlan, Cueva del Nacimiento del Rio SanAntonio, yielded specimens of numerous troglobites,including the first cavernicolous alpheid shrimpknown (Hobbs, 1973b), a palaemonid shrimp (Hobbs,1973b), the second troglobitic crayfish from Mexico(Hobbs, 1973a), a mysid (Bowman, 1973), a still undescribedcatfish, and the second species of blindtheraphosid known (Gertsch, 1973). The Valle Nacionalregion proved to be almost as biologicallyamazing. The two most productive caves were Cuevadel Guano and Cueva del Guayabo. New troglobiticspecies included crayfish and palaemonid shrimp(Hobbs, 1973b), pseudoscorpions, and isopods.In February 1973 a second extensive cave was discoverednear Acatlan. This cave, Cueva de LagunaVerde, has been little studied biologically, bu t collectionsby Peter Strickland and James Rodemakerincluded specimens of blind crayfish and shrimp.Serious study of the cave fauna of the YucatanPeninsula by members of the Association for MexicanCave Studies began in 1973. In a trip from February16 to May 14, partly supported by The Museum,Texas Tech University, Mary Butterwick,David McKenzie, Martha Helen McKenzie, StuartMurphy, and James Reddell visited numerous cavesin Veracruz, Oaxaca, Campeche, and Yucatan. Themost significant find in the non-Yucatan areas wasof a new species of troglobitic pseudoscorpion m11