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Species of Aphrastochthonius are known fromAlabama, Cuba, Central America, New Mexico, andCalifornia. Except for 2 species from Cuba andChiapas, Mexico, all are cavernicoles.Aphrastochthonius pachysetus MuchmoreAphrastochthonius pachysetus Muchmore, 1976:361, Figs. 1-3.The holotype female of this species was found inDoc Brito Cave, near White's City, Eddy County,New Mexico. No other representative is known.Genus Apochthonius ChamberlinApochthonius Chamberlin, 1929a:66; Muchmoreand Benedict, 1976:68.Apochthonius is distributed over most of theUnited States and Canada. Representatives are to befound in moist litter, both epigean and hypogean.Apochthonius magnanimus HoffApochthonius magnanimus Hoff, 1956a:4, Figs.2-4; Hoff, 1958:6.A male belonging to Apochthonius was collectedin Ogle Cave, Carlsbad Caverns National Park,Eddy County, New Mexico, 25 May 1974, by W.C.Welbourn. Though it is a little smaller than thetypes described by Hoff, it is, no doubt, arepresentative of A. magnanimus (see Welbourn,1978:31), accidental in the cave.Genus Tyrannochthonius ChamberlinTyrannochthonius Chamberlin, 1929a:74; Muchmore,1986:20.This genus has a wide distribution in the wannerparts of the world; in North America it is foundthrough the southern United States and into the Caribbeanarea and Central America (mostly unpublishedrecords). While Chamberlin and Malcolm(1960) made mention of troglobitic forms ofTyrannochthonius from Alabama, only 2 namedspecies have been reported from the United States,an epigean fonn from Florida and a troglobite fromTexas. Epigean representatives are found In moistlitter.Tyrannochthonius troglodytes MuchmoreTyrannochthonius troglodytes Muchmore, 1986:23,Fig. 11.The holotype and allotype of this species werecollected in Rock Slab Cave, on Enchanted Rock,Llano County, Texas. No other representative isknown.Tyrannochthonius texanus, new speciesFigs. 1, 2Tyrannochthonius spp.: Reddell, 1970:403.Type-data.-Holotype male (WMI078.01001)and allotype female (WM1078.01002) from ToothCave, Travis County, Texas, 14 May 1966 (J. Reddell).Paratype female from Ezell's Cave, San Marcos,Hays County, Texas, 7 September 1963 (J.Reddell); paratype male from Deep Cave, EdwardsCounty, Texas, 4 September 1965 (J. Reddell); 2paratypes (1 male, 1 female) from Wren Cave, ValVerde County, Texas, 9 April 1968 (J. Reddell andT. Mollhagen). All specimens mounted on slides(FSCA).Diagnosis.-Smaller than T. troglodytes (chelalength