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Nuevo Leon when, on July 13-19, 1942, C. Bolivar yPieltain, F. Bonet, B. F. Osorio Tafall, D. Pelaez, andothers visited Cueva de la Boca, Grutas de Villa deGarcia, Cueva del Carrizal, Grutas del Palmito, andother caves. A second trip to this area was madeSeptember 15-17, 1942, by C. Bolivar y Pieltain(Anonymous, 1942b). Collected on these two expeditionswere new species of troglobitic dipluran (Wygodzinsky,1944), collembolan (Bonet, 1943), phalangid(Goodnight and Goodnight, 1944), pseudoscorpion(Chamberlin, 1946), and beetle (Bolivar,1942).In September 1943 B. F. Osorio Tafall visited Yucatan.His collections in Actun Sabaca and Grutas deBalankanche resulted in the discovery of two speciesof pseudoscorpion representative of a new family,the Vachoniidae (Chamberlin, 1947). In November ofthe same year, C. Bolivar y Pieltain and B. F. OsorioTafall visited Grutas de Acuitlapan, Guerrero.During 1944 three of Mexico's better known caveswere revisited. On April 30 l Alvarez and C. Tellezvisited Grutas de Atoyac, Veracruz; on May 21 C.Bolivar y Pieltain, F. Bonet, l Alvarez, and C. Tellezvisited Cueva de Los Sabinos, San Luis Potosi; and onJune 17 F. Bonet visited Cueva de la Boca, NuevoLeon.In April 1944 Dr. and l\Jrs. M. W. Stirling of theBureau of American Ethnology of the SmithsonianInstitution and Mr. R. H. Stewart of the NationalGeographic Society visited Cueva del Azufre, Tabasco,and collected specimens of blind fish, now identifiedas Poecilia sphenops.In December 1945 F. Bonet, C. Bolivar y Pieltain,J. Alvarez, and other members-of the Escuela Nacionalde Ciencias Biologicas de Mexico visited Cueva deEl Pachon, Cueva del Abra, and Cueva de los Cuartelesin Tamaulipas and Cueva de El Jobo in San LuisPotosi. The most notable discovery of this expeditionwas the third population of blind fish of the genusAnoptichthys (described as A. antrobius by Alvarezin 1946).In April 1946 B. l Dontzin and E. Ruda revisitedCueva del Azufre, Tabasco, and collected a large seriesof blind and eyed Poecilia sphenops.B. F. Osorio Tafall and M. Cardenas Figueroavisited several caves in Yucatan as part of an expeditionsponsored in March 1947 by the Secretaria deRecursos Hidraulicos (Anonymous, 1947). Their discoveriesincluded specimens of the rare blind fishTyphliasina pearsei in Cenote del Pochote (Solorzano,1953). The infonnation gathered on this expeditionserved as material for an excellent study byCardenas Figueroa (1950) on the hydrobiology ofYucatan.During the course of the David Rockefeller MexicanExpedition of the American Museum of NaturalHistory in the summer of 1947, W. J. Gertsch visitedCueva del Diablo, Chihuahua, and collected an undescribedspecies of troglobitic Psilochorus (Spieth,1950).While conducting studies on the distribution andtaxonomy of opilionids during the summer of 1948,C. l Goodnight visited Grutas del Cocona, Tabasco,and several caves in Yucatan. Among many interestingspecies of arachnid collected were two eyelessspecies of amblypygid, not reported until they weredescribed by Rowland (1973d).In November 1950 Alejandro Villalobos of theInstituto de Biologia de Mexico began a series ofinvestigations into the cavernicole fauna of Mexicowhich was to result in the description of many newspecies of troglobite of great interest. His first expeditionwas to several caves in the vicinity of Comitanand Tuxtla Gutierrez, Chiapas. His visit to Cueva delTio Ticho resulted in the discovery of one of themore remarkable cavernicoles known from Mexico,an eyeless crab described by Enrique Rioja (1953h)as Typhlopseudothelphusa mocinol.In November and December 1950 F. Bonet andothers began the serious study of one of Mexico'sgreatest karst regions, that of Xilitla, San Luis Potosi.This study of the Xilitla region was continuedin January 1952 by F. Bonet in conjunction withR. Ortiz, l V. Flores, M. Camacho, and A. Gonzalez.In addition to collecting extensively they prepareddetailed maps and descriptions of the caves theyvisited (Bonet, 1953a).On November Il, 1951, C. Bolivar y Pieltain andAna Maria Bolivar visited Grutas de Quintero, Tamaulipas.This collection included new species ofcirolanid isopod (Rioja, 1953d) and pseudoscorpion(Beier, 1956).In Decmber 1951 and May 1952 A. Villalobosvisited Cueva del Ojo de Agua Grande, Veracruz. Thefauna discovered included a remarkable species oftroglobitic isopod (Rioja, 1953c).In January 1953 A. Villalobos continued his investigationsof the cavernicole fauna of Mexico witha visit to Cenote de Sambula at Motul, Yucatan.Among the fauna collected was a new species of trichonscidisopod (Rioja, 1958). In July C. J. Goodnightcollected arachnids, including a new troglobiticspider, in Grutas de Atoyac, Veracruz.The first study of the cavemicole fauna of Oaxacawas made in May 1954 by C. Bolivar y Pieltain, lCarranza, and others. A visit to Grutas de Monteflorresulted in the collection of a new species of troglobiticpseudoscorpion (Beier, 1956). In August 19547