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Records.-San Luis PotOSI: Sotano del Arroyo,?Cueva Pinta, Cueva de Los Sabinos, and ?Sotano dela Tinaja.Discussion.-The localities marked with a questionmark are not known by adult males but almost certainlybelong to this species. Shear (1974) stated thatspecimens from Cueva de Los Sabinos are "topotypes,"but this is in error since the type-locality isSotano del Arroyo. Specimens from Cueva de losMonos, San Luis Potosi, are very immature, but willprobably prove to belong to this species. Mexiterpessabinus is the most highly evolved troglobite in thegenus. This is of special interest since it is a lowlandtroglobite. Since the Trichopetalidae is a group oftemperate relicts in Mexico, it is not surprising thatthe epigean ancestors survived longer at more temperatehigher elevations. The existence of species withocelli in caves at high elevations suggests that theyhave become more recently restricted to caves. It isimportant to make intensive surface collections inthe Sierra Madre Oriental to determine whetherfully eyed species still survive in the epigean environment.The situation with these millipeds is probablyanalogous to that already discussed for Typhlochactasand for the Cleidogona crucis group.Order JulidaFamily JulidaeA single introduced species in the family Julidae,Diploiulus latistrintus (Curtis), has been taken inMexican caves. This species was collected in Cuevade las Cuatas, San Luis Potosi, and is probably anaccidental.Family ParaiulidaeAn apparently undescribed species of the genusParaiulus has been collected from three caves at Vallede los Fantasmas, San Luis Potosi. All were takennear the entrance or in areas where flood debris hadaccumulated, indicating that this is an accidental.Order PolydesmidaThe order Polydesmida has been a remarkablysuccessful group in colonizing the caves of Mexicoand Central America. Although 23 troglobites and 64other species are known from caves in this area (seeTable 20), probably as many more species await descriptionor identification. Each visit to a new caveregion produces additional new species of polydesmoids,including at least one or two troglobites, whilethe most carefully studied regions continue to producenew species with almost every investigation.Table 20.-Summary of cave-inhabiting Polydesmida.TroglobitesOther SpeciesChelodesmidae 0 1Euryuridae 1 1Oniscodesmidae 2 0Paradoxosomatidae 0 2Peridontodesmidae 1 2Pyrgodesmidae 0 34Rhachodesmidae 10 14Sphaeriodesmidae 0 8Trichopolydesmidae 8 0Tridontomidae 1 0Xystodesmidae 0 2Total 23 64Family ChelodesmidaeOnly one species of the family Chelodesmidae hasbeen identified from caves in Mexico. Chondrodesmussabachanus Chamberlin was described from ActUnSabaca, Yucatan. It or a closely related specieshas since been collected from several cave and surfacelocalities in northern Yucatan and eastern Campeche.Although Nicholas (1962) lists it as a troglobite, it isprobably a troglophile or trogloxene.Family EuryuridaeUndetermined species of the genus Pseudamplinusare known from caves in Chiapas, Oaxaca, San LuisPotosi, and Veracruz. The ecological status of themembers of this genus is unknown, but some may betroglophiles. The only troglobite in the family isPolylepiscus vomeroi Shear, which is discussed below.Polylepiscus vomeroi ShearPolylepiscus vomeroi Shear, 1977a:242, 244, 245,fig. 19-23.Type-locality.-Gruta II Finca Santa Anita, Simoyovelde Allende, Chiapas, Mexico.Distribution.-Known only from the type-locality.See Fig. 54.Discussion.-This depigmented and weakly sclerotizedspecies is the only trogiobite in the family. SpeciesofPolylepiscus are known only from Chiapas andGuatemala.Family OniscodesmidaeBonetesmus ojo ShearBonetesmus ojo Shear, 1974:260, fig. 29-31; Shear,1977a:260, fig. 44.Bonetesmus: Shear, 1977a:253.178