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Cryptocellus reddelli GertschCryptocellus new species: Reddell, 1967f:99-100.Cryptocellus sp.: Reddell, 1971b:34 (Cueva de losRiscos record only).Cryptocellus reddelli Gertsch, 1971b: 127, 130, 132,fig. 8-12; Cooke and Shadab, 1973:6; Reddell,1973a:34, 39; Reddell, 1973c:53; Brignoli,1974c:160, 167, 168, 169; [\-larquez and Conconi,1974:81, 82, 83, fig. 20; Dumitresco andJuvara-Bals, 1976:173; Reddell, 1977a:90.Type-locality.-Cueva de los Riscos, Sierra de laIndia, four miles south of Mapimi, Durango, Mexico.Distribution.-Known only from the type-locality.See Fig. 45.Discussion.-This is the only unquestionable troglobitein the order. The extreme elongation of appendages,paleness, and habitat within the cave all pointto a degree of cave adaptation not found among otherricinuleids. The species has been taken only from thecomplex of small rooms at the limit of exploration inthe cave. The few specimens which have been foundwere taken from clay or moist rock. The only otherspecies of ricinuleid known from the desert regionsof Mexico is C. mitchelli from Cueva del Guano,Durango. It is a typical guanophile and is relativelyabundant on guano in the inner rooms of this largebat cave.Cryptocellus sbordonii BrignoliCryptocellus sbordonii Brignoli, 1974c: 159-160, 164,167, 169, fig. lB, 3; Sbordoni et aI., 1974:30,45,pI. 4(10) (nomen nudum).Cryptocellus prope sbordonii: Brignoli, 1974c:155,160, 162, fig. 10; Sbordoni et aI., 1974:29; Dumitrescoand Juvara-Bals, 1976:163, 164, 178.Type-Iocality.-Cueva de las Canicas, Rancho delCielito, Ocozocoautla, Chiapas, Mexico.Distribution.-Known only from the type-localityand possibly one other cave at Rancho del Cielito,Chiapas. See Fig. 45.Records.-Chiapas: Cueva de las Can leas and?Cueva del Cerro Brujo.Discussion.-The holotype is a male, whereas thesingle specimen known from Cueva de Cerro Brujois a female; they are probably conspecific. This specieshas the most elongate legs in the genus and is,therefore, presumed to be a troglobite.Order OpilionidaThe order Opilionida includes a total of 50 specieswhich have been reported from the caves of the areaTable 16.-Summary of cave inhabiting Opilionida.TroglobitesOther SpeciesCyphophthalmiSironidae 1 0LaniatoresCosmetidae 0 7Phalangodidae 13 25PalpatoresNemastomatidae 1 0Phalangiidae 0 3Total 15 35under consideration. Many groups of opilionids havenot yet been studied, so this list will eventually bemuch longer. In particular, many species of thefamily Phalangiidae remain to be identified. SeeTable 16.Suborder CyphophthalmiFamily SironidaeNeogovea mexasca ShearNeogovea mexasca Shear, 1977b:165, 166, 167, 168,172-175, fig. 16-24.Type-Iocality.-Cueva del Nacimiento del Rio SanAntonio, 10 km SSW of Acatlan, Oaxaca, Mexico.Distribution.-Known only from two caves nearAcatlan, Oaxaca. See Fig. 46.New record.-Oaxaca: Cueva de la Finca (det.W. A. Shear).Discussion.-This species, the only troglobiticcyphophthalmid known in the Western Hemisphere,is the only species of the suborder known betweenFlorida and Guyana. The genus Neogovea includesthree other species, one from Brazil and two fromGuyana. Neogovea mexasca was described from females;the study of recently discovered males mayresult in a new generic assignment, possibly Siro.Other troglobitic cyphophthalmids are known fromSouth Africa and central Europe. The type specimenswere found on bat guano deposited on red clay approximately2 km from the entrance to the cave.Specimens collected in Cueva de la Finca were takenfrom a similar situation about 1 km from the caveentrance. This species has reduced sclerotization andmuch lengthened appendages, and is pale red.Suborder LaniatoresThe suborder Laniatores is well represented in thecaves of Mexico and Belize. Thirteen species of troglobiteand 31 other species are known. The taxonomyof this group is unfortunately in a state of flux. Silhavy(1974, 1977) recognizes the family Stygnopsidaeand places several species of laniatorids in this159