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Leucohya magnifica MuchmoreUndescrihed genus and species of pseudoscorpion:Reddell, 1967a:24.Hyidae, undescrihed genus and species: Reddell,1971h:27.Leucohya magnifica Muchmore, 1972a:271-272,fig. 12-13; Muchmore, 1973a:51; Reddell, 1973a:33,37.Type-locality.-Grutas del Carrizal, Nuevo Leon,Mexico.Distribution.-Known only from the type-locality.See Fig. 19.Discussion.-This species is known only from asingle female. Both species of Leucohya are knownfrom single caves in isolated limestone ranges separatedby desert terrain.Mexobisium goodnighti l\luchmoreMexobisium goodnighti Muchmore, 1973b:69-71, fig.22-25; Muchmore, 1977:71.Type-locality.-Cave near Augustine, Belize.Distribution.-Known only from the type-locality.See Fig. 19.Discussion.-This large species with attenuated appendagesis the only species of the genus known fromBelize. It is very distinct and may eventually provegenerically distinct from other species of Mexobisium.The genus Mexobisium includes seven speciesof fairly disparate morphology. Epigean species areknown from Cuba and from Chiapas and Oaxaca,Mexico. Troglohites occur in Guatemala, Belize, andTabasco and Veracruz, Mexico.}Uexobisium guatemalensf! 1\IuchmoreMexobisium guatemalense Muchmore, 1973h:67, 69,71, fig. 18-21; Muchmore, 1977:71.Type-locality.-Cueva Lanquin, Alta Verapaz,Guatemala.Distribution.-Known only from the type-locality.See Fig. 19.Discussion.-This is the only species of the genusknown to occur in Guatemala.Jlexobisium maya \luchmoreMexobisium maya l\luchmore, 1973b:67, 69, 71, fig.12-17; Muchmore, 1977:71.Type-locality.-Grutas de Cocona, 3 km NE Teapa,Tahasco, Mexico.Distribution.-Known only froUl the type-locality.See Fig. 19.Discussion.-This species is known from a singlemale, two females, and two tritonymphs. Its relationshipto other memhers of the genus is not clear althoughit is similar to M. pecki Muchmore, an epigeanspecies, in its general confonnation.Mexobisium paradoxum MuchmoreMexobisium paradoxum Muchmore, 1972a:273-275,fig. 14-19; Reddell, 1973a:37; Muchmore, 1973h:63,71-72.Mexobisium garadoxum: Reddell, 1973a:33 (erroneousspelling).Type-locality.-Cueva del Ojo del Agua de Tlilapan,Tlilapan, Veracruz, Mexico.Distribution.-Known only from the type-locality.See Fig. 19.Discussion.-This species is known only from theholotype female collected from a flowstone slope inthe Formation Room at the type-locality. J'1. paradoxumis unique in many respects, and its affinitiesto other memhers of the genus are ohscure.Troglohya carranzai BeierTroglohya carranzai Beier, 1956:83, 84-85, fig. 2;Chamherlin and Malcolm, 1960: 114; Barrera,1968:313; Muchmore, 1969:32; Reddell, 1971h:27; Muchmore, 1972a:261, 272; Muchmore,1973a:54,55.Type-locality.-Cueva de Monteflor, cerca de ValleNacional, N. Oaxaca, Mexico.Distribution.-Known only from the type-locality.See Fig. 19.Discussion.-This species is known only from asingle tritonymph. It is related to M. mitchelli Muchmore,but until further material is availahle, the degreeof relationship is unknown. The genus Troglohyamay prove to he more closely related to Vachoniumthan to Leucohya.Troglohya mitchelli MuchmoreTroglohya mitchelli Muchmore, 1973a:55-56, fig. 24­31; Iuchmore, 1977:71.Type-Iocality.-Grutas de Zapaluta, 6.5 kill SE LaTrinitaria, Chiapas, Mexico.Distribution.-Known only from the type-locality.See Fig. 19.Discussion.-This species, known from a single female,is larger and more attenuate than T. carranzai.Family IdeoroncidaeAlbiorix bolivari BeierAlbiorix bolivari Beier, 1963: 133-134, fig. 1; Barrera,1968:313; Muchmore, 1969:32; Reddell, 1971b:27; Muchmore, 1972a:261.121