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Discussion.-This species is distinct from othermembers of the genus Uncuklbes and in many respectsresembles Aceratophallus. It is interesting that thistroglobite inhabits the same caves as does the lesshighly evolved Strongylodesmus harrisoni. It is veryuncommon in the area, whereas S. harrisoni is abundant.It is possible that S. harrisoni is a more successfulrecent invader.Uncuklbes crispus CauseyPolydesmoid, undescribed genus and species: Reddell,1967d:l06.Rhachodesmidae, undescribed genus and species:Reddell, 1971a:44 (San Luis Potosi records only).Uncuklbes crispus Causey, 1971b:30, 31-32, fig. 18­20; Causey, 1973:118; Reddell, 1973a:34, 40;Shear, 1974:264,265,267,268.Uncuklbes versatilis Causey, 1971b:32; Causey, 1973:118; Reddell, 1973a:34, 40; Shear, 1974:264,265,267.Type-Iocality.-Of Uncuklbes erispus: Sotano deHuitzmolotitla, 2 km SW of Tlamaya, which is 10 kmNE of Xilitla, San Luis Potosi, Mexico; of Uncuklbesversatilis: Cueva de Potrerillos, 1.5 km W of Ahuacatlan,San Luis Potosi, Mexico.Distribution.-Known from caves in the Xilitla,Ahuacatlan, and Aquismon regions, San Luis Potosi.See Fig. 60.Records.-QuerE!taro: Sumidero del Llano Conejo;San Luis Potosi: Sotano de Guadalupe, Sotano deHuitzmolotitla; Cueva de los Potrerillos, and Sotanode Tlamaya.Discussion.-This comparatively widespread speciesshows some variation from area to area but notenough for taxonomic recognition. U. crispus isapparently most closely related to U. arganoi to thewest in Queretaro. The two areas are well separatedstratigraphically. Uncuklbes crispus was found inSotano de Huitzmolotitla on mud and silt banks inincredibly large numbers; the collectors reportedthat they literally turned mud banks white withtheir bodies. This species is extremely delicate, andmost preserved specimens are badly broken.Uncuklbes porrensis ShearUncuklbes porrensis Shear, 1974:264,268, fig. 45-49.Type-locality.-Cueva de la Porra, 3 mi north ofXilitla, San Luis Potosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 60.Discussion.-This species is closely related to U.arganoi and U. crispus.Family SphaeriodesmidaeThe family Sphaeriodesmidae is well representedin caves, and seven species are known only from caveswith many specimens still unstudied. Nicholas (1962)listed Cylionus kauanus Chamberlin from ActunKaua, Yucatan, as a troglobite, but it is doubtful ifany sphaeriodesmids can be reliably listed as troglobites.The cave inhabiting species show no significantdifferences from species which inhabit endogean habitats.Shear (1974) described four species from Mexicancaves: Sphaeriodesmus cruzbelem, S. golondrinensis,and S. zontehuitz are known only from .;avesin Chiapas; S. nortoni has been identified from CuevaChica de la Perra, Tamaulipas. Shear (1977a) addedS. trulkltus and S. redondo from caves in Chiapas.Collections of this family from many caves in NuevoLeon, Tamaulipas, Veracruz, Oaxaca, Campeche, andYucatan await study. See Fig. 61 for the distributionof this family in Mexican caves.Family TrichopolydesmidaeThe use of the name Trichopolydesmidae for thesmall millipeds discussed here is uncertain. Shear(1977a) has discussed the status of these species andspeculates that two or more families of small polydesmoidmillipeds now considered trichopolydesmidsmay occur and that the family Trichopolydesmidaemay not be present in Mexico. As presently understood,the family is represented in Mexico by two epigeanspecies in Baja California and by the six describedtroglobites listed here. Berlese collections ofsurface litter have resulted in the collection of additionalundescribed epigean species. Undescribed troglobitesare known from caves in Nuevo Leon, Oaxaca,San Luis Potosi, Veracruz, Campeche, and Yucatan.Caramba delburro ShearCaramba delburro Shear, 1977a:245, 246, 247, 248­249, fig. 24-28.Type-Iocality.-Cueva del Burro, Rio Escondido,Lago de Malpaso, Ocozocuatla (=Ocozocoautla), Chiapas,Mexico.Distribution.-Known only from the type-locality.See Fig. 54.Discussion.-The genus Caramba is known onlyfrom the three troglobitic species listed here. It ismore closely related to Tylogoneus tbm to othertrichopolydesmid genera. These two genera are consideredby Shear (1977a) to belong to a group whichincludes the genera Chaetaspis and Antriadesmus ofthe United States.188