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underflow of rivers, alluvial gravels, and finally thekarstic waters.Etlastenasellus mixtecus ArganoEtlastenasellus mixtecus Argano, 1977:117-121, fig.7-8; Ruffo and Vigna Taglianti, 1977:166.Type.locality.-Pozzo, villaggio di Etla, Oaxaca,Oaxaca, Mexico.Distribution.-Known only from the type-locality.See Fig. 7.Discussion.-Etlastenasellus is a monotypic genuswhich shows some affinities both to the MexicanMexistenasellus and to the African Magniezia. It wastaken from phreatic waters in association with Bogidiellaarganoi, B. niphargoides, and B. michaelae.Mexistenasellus coahuila Cole and MinckleyStenasellinae, undescribed genus: Minckley, 1969:25; Holsinger and Minckley, 1971:44l.Mexistenasellus coahuila Cole and lVlinckley, 1972:314, 315-319, fig. 1-31; Magniez, 1972:19, 20,23, 29; Holsinger, 1973:11; Magniez, 1973:164,168; Argano, 1974:102; Magniez, 1974a:50, 51,56,57,58,59, fig. llC, 13; Magniez, 1974b:100;Argano,1977:116.Mexistenasellus coahuili: Magniez, 1974a:57 (erroneousspelling).Mexistenasellus (part): Husson et aI., 1973: 122; Magniez,1973:181; Magniez, 1974a:7, 9, 25, SO-51,56-57,64,69, fig. 1; Bowman, 1976:339.Type-Iocality.-Eastern end of Laguna Juan Santos,8.5 km south and 8.0 km west of Cuatro Cienegasde Carranza, Coahuila, Mexico.Distribution.-Known only from springs andspring-fed pools southwest of Cuatro Cienegas, Coahuila.See Fig. 7.Records.-Coahuila: Pozo Barbado, Laguna Escobeda,Laguna Juan Santos, Small unnamed spring (8.2km S, 8.4 km W Cuatro Cienegas), Small unnamedspring (8.8 km S, 4.0 km W Cuatro Cienegas), andSmall unnamed seep near Pozo Barbado.Discussion.-The genus Mexistenasellus is knownonly from the four subterranean fOTIns discussed hereand from undescribed species from Nuevo Leon andTamaulipas.Mexistenasellus magniezi ArganoMexistenasellus magniezi Argano, 1974:98-102, fig.1-3; Magniez, 1974a:58, 59, fig. 13; Ruffo andVigna Taglianti, 1974:120; Argano, 1977:116.Mexistenasellus (part): Magniez, 1974a:7, 9, 25, 50,51,56-57,64,69, fig. 1; Bowman, 1976:339.Type-locality.-Well on the outskirts of the villageof Paraje Nuevo, near Cordoba, Veracruz, Mexico.Distribution.-Known only from the type-locality.See Fig. 7.Discussion.-This species is very similar to JH. coahuilain its dimensions and general body form. Sinceboth of these species inhabit a similar (phreatic) biotope,this is not surprising.Mexistenasellus parzeJalii MagniezMexistenasellus parzeJalii Magniez, 1972:19-24, 30,pI. 1-3; Hobbs and Hobbs, 1973:39; Husson et al.,1973:122; Magniez, 1973:163-170, pI. 1-2; Argano,1974:102; Magniez, 1974a:50, 51, 57-58,59, fig. llC, 13; Magniez, 1974b:122, 123, 125,126,128; Bowman, 1975:7; Argano, 1977:116.Mexistenasellus (part): Magniez, 1973:181; Magniez,1974a:7, 9, 25, 50-51, 56-57, 64,69, fig. 1; Bowman,1976:339.Type-locality.-Cueva del Huizache (=Huisache),Ciudad Valles, San Luis Potosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 7.Discussion.-This species is more closely related toJ{ wilkensi than to the other two species of the genus.It is very different from 11-1. coahuila and M. magnieziwhich inhabit phreatic waters rather than theopen waters of caves. It was found crawling on thebottom of a small pool OVi'r whil'h bats roosted.Mexistenasellus u;ilkensi \la~lliezMexistenasellus u;ilkensi :\lagniez, 1972: 19, 20, 23,24-29, :.lO, pI. 4-6; Hobbs and Hobbs, 1973:39;Husson et al., 1973:122; Magniez, 1973:163,164; Argano, 1974:102; lagniez, 1974a:1O-ll,57,58,59, fig. 2C, 13; Magniez, 1974b:115, 123,126; Bowman, 1975:7; Argano, 1977:116.Mexistenasellus (part): Magniez, 1973:181; Magniez,1974a:7, 9, 25, 50-51, 56-57, 64, 69, fig. 1; Bowman,1976:339.Type-Iocality.-Cueva del Huizache (=Huisache),Ciudad Valles, San Luis Potosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 7.Discussion.-This species is most closely related toM. parzeJalii. It was found in direct association withM. parzeJalli, the cirolanid Mexilana saluposi, and anundescribed anthurid of the genus Cyathura.Suborder AnthurideaFamily AnthuridaeCyathura sbordonii ArganoCyathura sbordonii Argano, 1971:304, fig. 1-4; Argano,1972b:26-33, fig. 1-3; Peck and Peck, 1973:68.90