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in Crystal Cave, Tamaulipas. The genus Tyrannochthoniusalso includes at least one and probably severalundescribed species of troglophile from caves in SanLuis Potosi and Tamaulipas.Aphrastochthonius major MuchmoreAphrastochthonius new species: Reddell, 1973a:33.Aphrastochthonius major Muchmore, 1973a:47-48,fig. 1; Reddell and Elliott, 1973b:181, 183; Muchmore,1976:364.Type.locality.-Cueva de la Capilla, 13.5 km NWGomez Farias, Tamaulipas, Mexico.Distribution.-Known only from the type-locality.See Fig. 18.Discussion.-This large species is known only froma single female. The genus Aphrastochthonius appearsto be largely restricted to caves. Aphrastochthoniustenax Chamberlin and A. pecki Muchmore are knownonly from caves in Alabama (Muchmore, 1972c); A.pachysetus Muchmore is known only from Doc BritoCave, Eddy County, New Mexico (Muchmore, 1976);A. alteriae Muchmore is known only from litter onthe surface at Ruinas de Palenque, Chiapas (Muchmore,1977); A cubanus Dumitresco and Orghidanwas described from fissures on Isla de Pinos, CubaGUATEMALA/r/r"\,.. . r"...:-Fig. 18.-Distribution of troglobitic pseudoscorpions of the family Chthoniidae: 1, Aphrastochthonius n. sp.; 2, A. major;3, Tyrannochthonius troglobius; 4, A. parous; 5, A. TUsse/li; 6, T. pa/lidus; 7, Tyrannochthonius n. sp.; 8, Paraliochthoniwstrinatii; 9, A. verapazanus.118