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actually a natural cave artificially enlarged by mercury(not iron) miners.Leptoneta isolata GertschLeptoneta: Reddell, 1967c:55.Leptoneta isolata Gertsch, 1971a:48, 51, 52, 53, fig.9-11; Gertsch, 1974:145, 178,179,180-181, fig.94,107-108,123; Hoffmann, 1976:8l.Neoleptoneta isolata: Brignoli, 1972: 137; Reddell,1973a:33, 38; Hoffmann, 1976:21, 81; Brignoli,1977:216.Type.locality.-Grutas de Garcia (=Grutas de Villade Garcia), Nuevo Leon, Mexico.Distribution.-Known only from caves in NuevoLeon and Tamaulipas. See Fig. 29.New record.-Tamaulipas: Cueva de California (det.W. J. Gertsch).Discussion.-This is a pale, essentially eyeless spe·cies related to the troglophile 1. pecki.Leptoneta limpida GertschLeptoneta limpida Gertsch, 1974:166, 174-175, fig.60,79; Hoffmann, 1976:113; Reddell, 1977a:90.Neoleptoneta limpida: Brignoli, 1977:216; Brignoli,1979:437.Type-Iocality.-Cueva de los Riscos, 4 km S Mapimi, Durango, i\'lexico.Distribution.-Known only from the type-locality.See Fig. 29.Discussion.-This pale, long-legged cavernicole hasreduced eyes. It is more closely related to the caveinhabiting species of the genus from Central Texasthan to the Mexican cave species. It was found insmall webs at the junction of wall and floor in a smallside room near the end of the cave.Leptoneta reclusa GertschLeptoneta reclusa Gertsch, 1971a:53-54, fig. 12-13;Gertsch, 1974:178, 179, 184, fig. 86, 95, 111-112,117; Hoffmann, 1976:82.Neoleptoneta reclusa: Brignoli, 1972:137; Reddell,1973a:38; Hoffmann, 1976:21, 82; Brignoli,1977:215.Type-Iocality.-Cueva de Chorros de Agua, 20 kmW of Montemorelos, Nuevo Leon, Mexico.Distribution.-Known only from the type-locality.See Fig. 29.Discussion.-This pale species with reduced eyes ismost closely related to 1. capil/a.Family LinyphiidaeAlthough nine species of linyphiid have been collectedfrom caves in this area, none show any signs ofadaptation for a cave existence. Erigone tamazunchalensisGertsch and Davis has been found in severalcaves in San Luis Potosi and Puebla; Jalapyphantesis represented by at least two species from caves inMexico and Guatemala; and the genus Meioneta includesseveral species in caves throughout Mexico.Family MysmenidaeThe family Mysmenidae is represented in Mexicancaves by seven species of the genus Maymena(Gertsch, 1960, 1971a, 1973a; Brignoli, 1974) (seeFig. 30). One of these, M. mayana (Chamberlin andIvie), ranges south from Oaxaca into Belize and Guatemala,where it also inhabits caves. Some specimensfrom caves have reduced eyes. The remaining six speciesare known only from caves in 'Mexico: Jl'1. cascadaGertsch from Oaxaca and Veracruz; M. chica Gertschfrom Nuevo Leon, San Luis Potosi, and Tamaulipas;M. delicata Gertsch from Oaxaca and Veracruz; M.grisea Gertsch from Tamaulipas; IH. misteca Certschfrom Guerrero and Oaxaca; and M. sbordonii Hrignolifrom Chiapas. Undescribed species are known fromcaves in Campeche, Oaxaca, Puehla, and Veracruz.Although Nicholas (1962) lists M. misteca and M.mayana as troglobites, no species of the genus showsextreme adaptations for a cave existence and allshould probably be considered troglophiles.Family NesticidaeAmong the more important elements in the cavefauna of Mexico are the spiders of the family Nesticidae.Species of the genera Nesticus, Eidmannel/a,and Gaucelmus are frequently found in caves in thisregion. Gertsch (in press) has revised the family inNorth America, Central America, and the West Indies.Two species of described Nesticus are considered hereto be troglobites, and an additional two species aretroglophiles: Nesticus hoffmanni Gertsch from cavesin Hidalgo and N. vazquezi Gertsch from caves inQueretaro (see Fig. 31). Five troglophilic speciesfrom caves in Queretaro, Oaxaca, and Tamaulipas remainundescribed. Eidmannel/a pal/ida (Emerton)ranges south from the United States into Guatemalaand has been recorded from essentially every state inMexico for which we have cave collections (see Fig.32). An undescribed troglophile of the genus isknown only from Cueva de El Pachon, Tamaulipas.The genus Gaucelmus is represented by three species:G. calidus Gertsch ranges north from Huehuetenango,Guatemala, into Hidalgo, Mexico; G. augustinus Keyserlingis a troglophile in caves from Guatemala intothe United States; G. strinatii Brignoli was recentlydescribed from Cueva Chirrepeck, Alta Verapaz,Guatemala (Brignoli, 1979b).140