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Type-locality.-Cueva del Ojo de Agua de Tlilapan,Tlilapan, near Orizaba, Veracruz, Mexico.Distribution.-Known only from the type-locality.See Fig. 54.Discussion.-The Oniscodesmidae reaches itsnorthern distributional limit in Veracruz where it isrepresented by the two troglobitic species listed here.The only other Mexican species is an epigean species,Ligiodesmus pusillus Pocock, from Tabasco.Bonetesmus verus ChamberlinBonetesmus verus Chamberlin, 1942: 11-12, fig. 18­20; Chamberlin, 1943b:6, 62; Bonet, 1946a:113;Loomis, 1968:111; Causey, 1971b:30; Reddell,1971b:44; Shear, 1974:256, 257, 259-260, 274,fig. 20-28.Bonestmus verus: Nicholas, 1962:177 (erroneousspelling).Bonetesmus novenus Causey, 1971b:30; Reddell1973a:40; Shear, 1974:257,259.Type-locality.-Of Bonetesmus verus: Grutas deAtoyac, Veracruz, Mexico; of Bonetesmus novenus:Cueva del Ojo de Agua Grande, 12 km NE Cordoba,Veracruz, Mexico.Distrihution.-Known from three caves in the vicinityof Cordoba, Veracruz. See Fig. 54.MEXICOGUATEMALA\r",..""--//rr"Fig. 54.-Distribution of troglobitic millipeds of the families Trichopolydesmidae, Oniscodesmidae, Euryuridae, and Tridontomidae:1, Ty/ogoneus minus; 2, Speodesmus pecki; 3, Ty/ogoneus rainesi; 4, Bonetesmus verus; 5, B. ojo; 6, Carambade/burro; 7, Po/y/episcus vomeroi; 8, C. de/negro; 9, C. grandeza; 10, Tridontomus loomisi.179