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Distribution.-Known only from caves in the Xilitlaand Aquismon regions, San Luis Potosi. See Fig.25.Records.-San Luis POtOSI; Sotano de Huitzmolotitlaand Sotano de Tlamaya.New record.-San Luis PotOSI; Cueva de San Rafael(det. C. Mullinex).Discussion.-This species has the median oculartubercle and median eyes completely missing.Order AraneaeThe spider fauna of the caves of Mexico is one ofthe richer in the world, both in number of species andin number of troglobites. The few collections of spidersfrom caves in Guatemala and Belize also givepromise of many troglobites. A total of 47 species oftroglobite has been collected from the caves of thisregion; an additional 252 species of troglophile, trogloxene,and accidental have been recorded from thecaves of these three countries (see Table 15).Suborder MygalomorphaeThe suborder Mygalomorphae is generally poorlyrepresented in the cave faunas of the world. Gertsch(1973b) lists only seven species of cave-adapted mygalomorph.It is especially interesting that four ofthese species are from caves in Mexico.Family BarychelidaeAt least one unidentified species of the barychelidgenus Zygapelma has been collected from caves inMexico and Guatemala. Chamberlin and Ivie (1938b)described Zygopelma meridana from Cueva de SanIsidro, Yucatan. The ecological status of the cavernicoleZygopelma is unknown. A single barychelid species,Traglothele coeca Fage, is a troglobite; it isknown from Grutas de Bellamar, Cuba.Family CtenizidaeThe trap-door spiders of the family Ctenizidae includea single species which has been found in cavesin Mexico. Several specimens of Cyclosamin (Chari·zaps) laricata (C. Koch) were obtained from burrowsbelow the entrance drop of Sotano de los Guacamayos,Tamaulipas; a single female was collected as itran along a mud bank in Sotano del Tigre, San LuisPotosi (Gertsch and Platnick, 1975).Family DipluridaeThe family Dipluridae includes, in addition to thetwo troglobites listed below, two other troglobiticdiplurids: Accola caeca Simon from caves in theTable I5.-Summary of cave inhabiting Araneae.MygalomorphaeBarychelidaeCtenizidaeDipluridaeTheraphosidaeAraneomorphaeAgelenidaeAmaurobiidaeAnyphaenidaeAraneidaeCaponiidaeClubionidaeCtenidaeDictynidaeDysderidaeFilistatidaeGnaphosidaeHahniidaeLeptonetidaeLinyphiidaeLycosidaeMysmenidaeNesticidaeOchyroceratidaeOecobiidaeOonopidaePholcidaePisauridaePlectreuridaeSalticidaeScytodidaeSegestriidaeSelenopidaeTelemidaeTengellidaeTetrablemmidaeTheridiidaeThomisidaeUloboridaeZodariidaeTotalTroglobiteso355o oooooooooo6ooo42o119oooooo1o1oooo47Other Species11221221151122114415113810416751242011o1128341252Philippine Islands and Trogladiplura lawryi Mainfrom Roaches Rest Cave, Australia.Euagrus anops GertschEuagrus anops Gertsch, 1973b:141, 142, 144, 145,fig. 4; Brignoli, 1974b:199, 200; Hoffmann,1976:16.Type-Iocality.-Cueva de la Porra, 5 km N Xilitla,San Luis Potosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 26.Discussion.-This is a pale, eyeless species knownonly from a single female. In addition to the twotroglobites listed here, several other species of Euagrusare known from caves in Mexico, only one of133