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(Dumitresco and Orghidan, 1977); the remammgfour species are troglobites from Mexico and Guatemalaand are listed below. An undescribed troglobitehas been recently collected in Sumidero de Oyamel,Tamaulipas.Aphrastochthonius parvus MuchmoreAphrastochthonius sp.: Reddell and Mitchell, 1971a:144.Aphrastochthonius parvus Muchmore, 1972c :437­438, 440, 441, 442, fig. 4-7; Reddell, 1973a:33,37; Reddell and Elliott, 1973a:171, 173; Muchmore,1976:364; Dumitresco and Orghidan, 1977:100, 10l.Type-locality.~La Cueva de la Florida, 15 kilometersS.S.W. of Mante, Tamaulipas, Mexico.Distribution.~Known only from the type-locality.See Fig. 18.Discussion.~This is the smallest species in the genusand is known only from a single female collectedfrom the cave wall.Aphrastochthonius russelli MuchmoreAphrastochthonius russelli Muchmore, 1972c:440­441,442, fig. 10-12; Reddell, 1973a:33, 37; Reddelland Elliott, 1973a:171, 173; Muchmore,1976:364.Type-locality.-La Cueva Pinta, about 12 kilometersN.E. of Valles, San Luis Potosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 18.Discussion.-This species is known only from asingle tritonymph. The species is probably mostclosely related to A. parvus, a species occurring inthe northern Sierra de EI Abra. Until adults of A.russelli are available, the relationships of this speciesmust remain uncertain.Aphrastochthonius verapazanus MuchmoreAphrastochthonius verapazanus Muchmore, 1972c:438, 440, 442, fig. 8-9; Muchmore, 1973a:48;Muchmore, 1976:364; Dumitresco and Orghidan,1977:101; Muchmore, 1977:63.Type.locality.-La Cueva Sepacuite No.2, Senahu,Finca Sepacuite, Alta Verapaz, Guatemala.Distribution.-Known only from the type-locality.See Fig. 18.Discussion.~This very attenuate species is knownonly from a single female.Paraliochthonius strinatii BeierParaliochthonius strinatii Beier, 1974:101-102, fig. 1;Strinati, 1977:388.Type-locality.-Cueva Chirrepeck, Alta Verapaz,Guatemala.Distribution.-Known only from the type-locality.See Fig. 18.Discussion.-In addition to this troglobite, the genusParaliochthonius is known by species from theeastern Mediterranean, Madeira, the Canary Islands,Jamaica, Puerto Rico, and Baja California and J alisco,Mexico (Muchmore, 1972b). Muchmore (pers.comm.) indicates that this species is probably misplacedand may belong in Tyrannochthonius.Tyrannochthonius pallidus MuchmoreTyrannochthonius pallidus Muchmore, 1973c:81-82,fig. 1-2.Type-locality.-Cueva de EI Jobo, 5 km NE Xilitla,San Luis Potosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 18.Discussion.-This species is known only from asingle male collected from under a rock. It is mostclosely related to T. troglobius, but it is smaller withless attenuate appendages. Troglobitic members ofthis genus are also known from caves in Alabama. Anundescribed troglobitic species has recently been collectedin Cueva de Las Maravillas, Oaxaca.Tyrannochthonius troglobius MuchmoreTyrannochthonius troglobius Muchmore, 1969:31­32, fig. 1-3; Reddell, 1971b:27; Reddell andMitchell, 1971b:184; Mitchell and Kawakatsu,1973a:671; Muchmore, 1973c:81-82; Reddell,1973a:33, 37; Reddell and Elliott, 1973b:18l.Type-locality.-Mine Cave (=Cueva de la Mina),Rancho del Cielo, Tamaulipas, Mexico.Distribution.~Known only from the type-locality.See Fig. 18.Discussion.~This species is most closely related toT. pallidus. Both troglophilic and epigean species ofthe genus are known from the vicinity of Cueva de laMina, but all remain undescribed.Family TridenchthoniidaeA single species of the family Tridenchthoniidaehas been reported from Mexican caves. Tridenchthoniusjuxtlahuaca was described from bat guano inGrutas de Juxtlahuaca, Guerrero, and is presumably atroglophile (Chamberlin and Chamberlin, 1945) (seeFig. 18).119