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Acutangulus alius CauseyAcutangulus alius Causey, 1973:108, 109, fig. 3-6.Type-locaIity.-Cueva del Ojo de Agua de Tlilapan,Tlilapan, Veracruz, Mexico.Distrihution.-Known only from the type-locality.See Fig. 58.Discussion.-This is the only troglobite in the genusAcutangulus. There are presently five describedspecies in this genus from Veracruz and two undescribedspecies from Oaxaca (Causey, 1973). Acutanguluspictus Causey has been collected in Sotano deBotella Chica, Veracruz, but is probably an accidental.Acutangulus alius was found on silt and breakdownalong the edges of the first bat room in thetype-locality. It appeared to avoid the main guanodeposits.Ceuthauxus constans CauseyCeuthauxus constans Causey, 1973:111-112, fig. 9­10.Type-locaIity.-Grutas del Mogote, El Mogote, 15km NNE Taxco, Guerrero, Mexico.Distrihution.-Known only from two caves in theDolina de El Mogote, Guerrero. See Fig. 58.Records.-Guerrero: Cueva Chica del Mogote andGrutas del Mogote.Discussion.-This abundant troglobite is thesouthernmost species of the genus, which rangesnorth to Nuevo Leon. Other species are known fromMorelos, Veracruz, Oaxaca, Tamaulipas, and Coahuila.This species is apparently closely related to C.palmitonus Chamberlin. In Grutas del Mogote it waspresent in large numbers on silt banks. Ceuthauxusgaleanae (Chamberlin) has been taken from caves nearGaleana, Nuevo Leon, while C. mediator Chamberlinhas been found in small caves on Cuesta de Chipinquenear Monterrey, Nuevo Leon. Both species are probablyaccidentals.Ceuthauxus palmitonus ChamberlinCeuthauxus palmitonus Chamberlin, 1942:12; Chamberlin,1943b:5, 52; Bonet, 1946a:112; Chamberlin,1947:32; Nicholas, 1962:176; Causey, 1973:111.Ceuthauxius palmitonus: Bolivar, 1944:26 (erroneousspelling).Ceuthauxus palmitensis: Reddell, 1967a:24 (erroneousspelling).Strongylodesmus palmitonus: Loomis, 1968:41; Reddell,1971b:45.Type-locaIity.-Gruta del Palmito, Bustamente(=Bustamante), Nuevo Leon, Mexico.Distrihution.-Known only from the type-locality.See Fig. 58.Discussion.-This is the northernmost describedspecies of the family Rhachodesmidae. It is apparentlya relict species now restricted to its cave habitatby the surrounding desert. Other relict speciesinclude C. nuevus Chamberlin which is known onlyfrom the vicinity of the spring, Ojo de Agua, atSabinas Hidalgo, Nuevo Leon; and an undescribedepigean species taken in the entrance area of Cuevadel Carrizal, Nuevo Leon. Specimens have been collectedfrom Grutas del Palmito in the main entranceroom in moist, silted areas, from rotting wood, andfrom an oatmeal trail.Pararhachistes amblus ChamberlinPararachistes amblus Chamberlin, 1942: 13, fig. 21­22; Chamberlin, 1943b:5, 53; Bonet, 1946a:112;Nicholas, 1962: 176.Pararhachistes amblus: Loomis, 1968:39; Reddell,1971b:45.Type-locaIity.-Cueva de Jutxlahuaca (=Grutas deJuxtlahuaca), Colotlipa, Guerrero, Mexico.Distribution.-Known only from the type-locality.See Fig. 58.Discussion.-The genus Pararhachistes, in additionto this troglobite, includes two epigean species fromGuerrero. Pararhachistes amblus has been collectedrecently from silt banks and rotten wood.Strongylodesmus harrisoni CauseyMilliped, new genus and species: Reddell, 1966a: 13;Reddell, 1967c:55.Rhachodesmidae, undescribed genus and species:Reddell, 1971b:44 (Tamaulipas records only).Strongylodesmus harrisoni Causey, 1971b:31; Reddelland Mitchell, 1971b:189, fig. 14; Causey,1973:113, 114, 116, fig. 17-18; Mitchell andKawakatsu, 1973a:671, 673; Reddell, 1973a:34,40; Reddell and Elliott, 1973b:181, 185; Shear,1974:261, 263, fig. 32-34; Fernandez Ruiz, 1976:717.Type-locaIity.-Cueva del Rancho del Cielo No.7,5 km NW of Gomez Farias, Tamaulipas, Mexico.Distribution.-Known from caves in the Sierrade Guatemala, Tamaulipas. See Fig. 59.Records.-Tamaulipas: ?"Sinkhole" at Ranchodel Cielo, Cueva de la Capilla, Crystal Cave, ?Sotanode Gomez Farias, Harrison Sinkhole, Cueva del Infiernillo,Sumidero de EI Jineo, ?Sotano de la Joyade Salas, Sotano del Leon, Resumidero de los Mangos,Cueva de la Mina, Sotano del Molino, Cueva de185