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Type-Iocality.-Cueva Bonita del Presidente, 2 kmN Huautla, Oaxaca, Mexico.Distribution.-Known only from the type-locality.See Fig. 64.Discussion.-Pseudosinella bonita is white and eyeless.It is the most highly evolved troglobite in thegenus in Mexico. Five species of Pseudosinella areknown from Mexican caves. Of the two troglophiles,one, P. violenta (Folsom), is abundant in caves inCentral Texas; it is also known from caves in Coahuilaand Durango. The other troglophile, P. reddelliChristiansen, is a widespread, variable species rangingfrom Coahuila south to southern San Luis PotosI. Anundescribed troglobite, reported by Bonet (1953a)as Pseudosinella sp., is known from caves in theXilitla region, San Luis PotosI.Pseudosinella Jinca ChristiansenPseudosinella Jinca Christiansen, 1973:129, 130-131,fig. 4.Type-Iocality.-Cueva Sepacuite, Alta Verapaz,Guatemala.Distribution.-Known from three caves in AltaVerapaz, Guatemala, and one in Oaxaca, Mexico. SeeFig. 64.Records.-GUATEMALA: Alta Verapaz: Grutasde Lanquin, Cueva Seamay, and Cueva Sepacuite.New record.-MEXICO: Oaxaca: Cueva del Nacimientodel Rio San Antonio (det. K. Christiansen).Discussion.~This species is eyeless and pigmentless.It appears to be most closely related to P. petrustrinatii.Pseudosinella petrustrinatii Christiansen-New NamePseudosinella strinatii Christiansen, 1973:130, 131­132, fig. 2 (not P. strinatii Gisin, 1951); Reddelland Elliott, 1973a:175; Reddell and Elliott,1973b:182,185.Type-Iocality.-Crystal Cave, Rancho del Cielo,5 km WGomez Farias, Tamaulipas, Mexico.Distribution.-Known from caves in the Sierra deGuatemala, Tamaulipas; Sierra de EI Abra, San LuisPotosi and Tamaulipas; and one cave in the Sierra elPino, San Luis Potosi. See Fig. 64.Records.~an Luis Potosi: Cueva Chica, Cueva deLa Lagunita, Cueva de los Monos, Cueva Pinta, Cuevade Taninul n. 1; Sotano del Tigre, and Sotano de Yerbaniz;Tamaulipas: Crystal Cave, Cueva de la Florida,Cueva de EI Pachon, Cueva de la Paloma, and Cuevade San Rafael de los Castros.Discussion.-Dr. Kenneth Christiansen has suggestedthat the new name, Pseudosinella petrustrinatii,be used for P. strinatii. "Due to an oversight,P. strinatii Christiansen (1973) is a junior homonymof P. strinatii Gisin (1951). I propose the new namePseudosinella petrustrinatii to replace P. strinatiiChristiansen" (Christiansen, in litt.). Pseudosinellapetrustrinatii is pigmentless and eyeless, and has beendivided by Christiansen into three forms, which mayeventually prove to be distinct species. The typelocality,Crystal Cave, is the only locality for Type C.Type A occurs only in the Sierra de EI Abra; Type Bis known from the Sierra de EI Abra and from Cuevade La Lagunita.Troglopedetes maya (Mills)Trogolaphysa maya Mills, 1938:183, 184, 186, fig.13-16; Arle, 1939:29; Absolon and Kseneman,1942:22, fig. 21; Bonet, 1942:59; Pearse, 1945:175; Delamare Deboutteville, 1951:293; Nicholas,1962:179.Troglopedetes maya: Bonet, 1942:59; Salmon, 1964:531; Reddell, 1971b:50; Massoud and Gruia,1973:339; Gueorguiev, 1974:683; Reddell,1977b:234, 239, 240, 271, 285-286.Trogolaphysa: Delamare Deboutteville, 1951:293,294,295, fig. 65; Salmon, 1964:134.Type-Iocality.-Balaam Canche Cave (=Grutas deBalankanche), Chichen Itza, Yucatan, Mexico.Distribution.-Known from two caves in Yucatan.See Fig. 64.Records.-Yucatan: Grutas de Balankanche andActUn Xkyc.Discussion.-This white, eyeless species is closelyrelated to T. delamarei Massoud and Gruia from acave in Cuba. Undescribed troglobites in this genusare known from caves in Guerrero and Veracruz.Family HypogastruridaeTwo species of the family Hypogastruridae (Acherontidesatoyacense and A. potosinus) are troglobites.In addition, three species of troglophile have beenidentified from Mexican caves (see Fig. 65). Acherontiellasabina Bonet is a frequently collected speciesin caves in San Luis Potosi, Tamaulipas, and NuevoLeon (Bonet, 1945; 1946b). Brachystomella parvula(Schaeffer) was identified by Bonet (1953a) fromCueva de la Hoya, San Luis Potosi. Bonet (1945)described Willemia persimillis bulbosa from Cueva deLos Sabinos, San Luis Potosi.Acherontides atoyacense BonetAcherontides atoyacense Bonet, 1945:28-31, fig. 24­31; Bonet, 1946a:114; Bonet, 1946b:52, 55, 56,57, 62; Bonet, 1953a:23, 30; Stach, 1959:435;Nicholas, 1962:179; Salmon, 1964:189; Gruia,198