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Shrimp: Reddell, 1973d:89.Macrobrachium (part): Hobbs et al., 1977:5, 13, 15,16,50.Type-Iocality.-Cueva del Nacimiento del Rio SanAntonio, 10 km SSW Acathln, Oaxaca, Mexico.Distribution.-Known only from two caves nearAcatlan. Oaxaca. See Fig. 15.New record.-Oaxaca: Cueva de la Finca (det. H.H. Hobbs, Jr.).Discussion.-This species is most closely related toM. acherontium. It was taken from pools in associationwith Spelaeomysis olivae, Alpheopsis stygicola,Procambarus (Austrocambarus) oaxacae reddelli, andan undescribed blind catfish of the genus Rhamdia.Neopalaemon nahuatlus Hobbs.Veopalaemon nahuatlus Hobbs, 1973a:25, 26-27, 29,fig. 1-2; Holthuis, 1974: 142; Hobbs et al., 1977:6,8, 11, 12,25,52,53,118, fig. 21; Holthuis, 1977:181.Large blind shrimp: Reddell, 1973d:90.Neopalaemon: Hobbs et aI., 1977:5, l-t, 16,52.Type-Iocality.-Cueva del Guano, 10 km NE Valle, acional, Oaxaca, l\lexico.Distribution.-Known only from the type-locality.See Fig. 15.Discussion.-This remarkable troglobite is the onlyknown species in the genus Neopalaemon. Neopalaemonis possibly most closely related to Macrobrachium.The eye pigment and cornea are absent in thisspecies. These large shrimps were found in abundancein a deep permanent stream which runs beneath alarge bat colony. They have been found in associationwith Procambarus (Austrocambarus) oaxacae oaxacae.Troglocubanus perezfarfanteae VillalobosTroglocubanus sp.: Reddell, 1967d:82; Reddell,1971b:26; Reddell and Mitchell, 1971a:143-144;Reddell and Elliott, 1973a: 171.Troglocubanus: Reddell, 1973a:32.Troglocubanus, undescribed species: Holthuis, 1974:142.Troglocubanus perezfarfanteae Villalobos, 1974:1-5,fig. 1-23; Strenth, 1976:13; Hobbs et al., 1977:6,8, 11, 25, 64-66, fig. 30; Holthuis, 1977:181;Mitchell et aI., 1977:49.Troglocubanus (part): Hobbs et al., 1977:5,14,58.Type-Iocality.-Sotano de Tinaja, 11.7 km E.NE.Valles, San Luis Potosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 15.Discussion.-This remarkably delicate species hasextremely elongate appendages. The only known specimenwas obtained from near the surface of a deeplake in the deepest part of Sotano de la Tinaja. Itsextreme transparency has probably aided it in escapingnotice during the ex tensive explorations ofcaves in the Sierra de EI Abra. The genus Troglocubanusis otherwise known only from caves in Cuba.This species, therefore, is another of a series ofgroups of marine relicts shared both by the Mexicanmainland and the greater Antilles.Suborder ReptantiaSection MaeruraFamily CambaridaeAlthough crayfishes are frequently found in Mexicancaves and a total of 12 species are recorded, onlythree closely related forms have become troglobitic(see Fig. 16). This is a surprisingly low figure when itis compared with the crayfish fauna of the easternUnited States where more than 20 species and subspecieshave been described as troglobites (Hobbs andBarr, 1972). In addition to the three troglobites listedand discussed below, the following crayfish species,all presumably troglophiles, are known from caves inMexico. Procambarus (Austrocambarus) mirandaiVillalobos inhabits a long, meandering stream passagein Cueva Cerro Hueco, Chiapas (Villalobos, 1954); ithas also been found in Cueva del Arco and Cueva dePaso Burro, Chiapas (Hobbs, 1977). Procambarus (A.)pilosimanus (Ortmann) is a widely distributed speciesin southern Mexico; it is known from a pool in Grutasde Zapaluta, Chiapas, which connects directly with asurface pool (Villalobos, 1955), and from two cavesin Alta Verapaz, Guatemala (Delamare Debouttevilleand Juberthie, 1976). Procambarus (A.) sbordoniiHobbs was described from Cueva del Nacimiooto delRio Santo Domingo, Chiapas (Hobbs, 1977). Procambarus(Ortmannicus) acutus cuevachicae (Hobbs)is found in abundance in Cueva Chica, San Luis Potosi(Hobbs, 1941); it is a widely distributed formthroughout east-central Mexico, but it is not definitelyknown from other caves in the Sierra de EIAbra. Procambarus (0.) toltecae Hobbs is seldom collectedon the surface but has been taken from cavesin the Xilitla and Aquismon regions of San Luis Potosiand fmm Cueva de EI Tenango, Hidalgo. InCueva de EI Tenango it was abundant in the longstream passage which runs through the cave. Procambarus(0.) villalobosi Hobbs is known only fromCueva del Agua, near Rayon, San Luis Potosi (Hobbs,1969b), and from Pozita de Ojo de Agua, San LuisPotosi. This species inhabits both the cave stream anduo