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Type-Iocality.-Cueva de El Jobo, El Jobo, SanLuis Potosi, Mexico.Distribution.-Known from caves in the Xilitlaregion, San Luis Potosi. See Fig. 65.Records.-San Luis PotoSI: Cueva del Aire, Cuevade los Cuchos, Cueva de la Roya, Cueva del J obo, andCueva del Salitre.Discussion.-This is an eyeless, pigmentless speciesclosely related to A. atoyacense.Family IsotomidaeTwo troglophilic species of the family Isotomidae(Folsomia sp. and Folsomina onychiurina Denis) wereidentified by Bonet (1953a) from caves in the Xilitlaregion, San Luis Potosi. Proisotoma sp. has been collectedin Sotano de Yerbaniz, San Luis Potosi; andP. centralis Denis was reported by Mills (1938) fromCenote Yunchen, Yucatan.Family NeelidaeBonet (1947) in his monograph on the familyNeelidae reported Neelus murinus Folsom fromCueva de Los Sabinos, San Luis Potosi; N. murinusbolivari Bonet from Cueva de San ta Elena, Yucatan;and Megalothorax minimus Willem from caves InNuevo Leon and Yucatan. All are troglophiles ortrogloxenes.Family OncopoduridaeOncopodura atoyacense BonetOncopodura atoyacense Bonet, 1943:133, 140, 145­147, fig. 14-16; Bonet, 1946a:114; Nicholas,1962:179; Salmon, 1964:297; Reddell, 1971b:51.Oncopodura atoyacensis: Gueorguiev, 1974:683(erroneous spelling).Type-Iocality.-Cueva (=Grutas) de Atoyac, Atoyac,Veracruz, Mexico.Distribution.-Known only from the type.locality.See Fig. 66.Discussion.-The genus Oncopodura is representedby several species in Europe, one in Japan, one troglobitein Montana (U.S.A.), and the two Mexican troglobiteslisted here.Oncopodura prietoi BonetOnchopodura: Anonymous, 1942b:265 (erroneousspelling).Oncopodura prietoi Bonet, 1943:133, 141, 147-150,fig. 17·22; Bolivar, 1944:26; Bonet, 1946a:114;Nicholas, 1962:179; Salmon, 1964:298; Reddell,1971b:51; Reddell and Elliott, 1973b:182·186.Oncopodura sp.: Reddell and Mitchell, 1971b:191.Oncopodura prietori: Gueorguiev, 1974:683 (erroneousspelling).Type-Iocality.-Gruta del Palmi to, Bustamante,Nuevo Leon, Mexico.Distribution.-Known from the type-locality andpossibly one cave in the Sierra de Guatemala, Tamau·lipas. See Fig. 66.Records.-Nuevo Leon: Grutas del Palmito; Tamaulipas:?Bee Cave.Discussion.-This eyeless species is closely relatedto several European species. The record of this speciesfrom Bee Cave is based on a single specimen. Additionalmaterial is needed to verify this identification.Family OnychiuridaeAt least three species of the family Onychiuridaehave been identified from Mexican caves. Mesaphorurakrausbaueri Borner and Onychiurus sp. were reportedby Bonet (1953a) from caves in the Xilitlaregion, San Luis PotosI. Onychiurus fimetarius(Linnaeus) has been collected in Resumidero dePablillo, Nuevo Leon. Mesaphorura foveata Bonetwas reported from Cueva Chica, San Luis Potosi(Bonet, 1944b).Family PoduridaeIn addition to the troglobitic Spelaeogastruraguerrerense Bonet, three other podurids have beenidentified from Mexican caves (see Fig. 66). Mills(1938) described the troglophile Xenylla yucatanafrom Cenote de Sambula (Motul), Yucatan. Recentcollections have included Paranura caeca Folsomfrom Grutas del Mogote, Guerrero, and Tafallia sp.from Cueva del Huisache, San Luis PotosI.Spelaeogastrura guerrerense BonetSpelaeogastrura guerrerense Bonet, 1945:22-27, fig.1-10, 17-23; Bonet, 1946a:114; Nicholas, 1962:179; Salmon, 1964:239; Reddell, 1971b:51.Speleogastrura: Delamare Deboutteville, 1951:272(erroneous spelling).Spelaeogastrura: Salmon, 1964:108,239.Type-locality.-Gruta de Cacahuamilpa, Cacahuamilpa,Guerrero, Mexico.Distribution.-Known only from the type-locality.See Fig. 66.Discussion.-This eyeless, pigmentless species is theonly member of the genus. Spelaeogastrura is possiblymost closely related to the genus Schafferia.200