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Records.-Chiapas: Sumidero de Canada and Grutasde Llano Grande.Discussion.-This small-eyed presumed troglobiteis most closely related to H. queretarius.Mexotroglinus sbordonii SilhavyMexotroglinus sbordonii Silhavy, 1977:220, 231­233, fig. 24-28.Type·locality.-Cueva del Perro de Agua, Rioegro, Lago de 1alpaso, Ocozocoautla, Chiapas,Mexico.Distribution.-Known only from the type-locality.See Fig. 49.Discussion.-The monotypic genus Mexotroglinusis most closely related to Monterella. This species iseyeless and depigmented with a reduced eyemound.Stygnomma pecki Goodnight and GoodnightStygnomma pecki Goodnight and Goodnight, 1977:148, 150, fig. 11.Type.locality.-St. Herman's Cave, Caves Branch,Belize.Distribution.-Known only from two caves atCaves Branch, Belize. See Fig. 49.Records.-BELIZE: Cayo District: Mountain CowCave and St. Herman's Cave.Discussion.-This is the only troglobitic species ofthe genus Stygnomma known from mainland NorthAmerica. Rambla (1969) described S. fiskei from acave in Jamaica; it is also eyeless. Stygnomma peckiis eyeless and light yellow. Stygnomma tuberculataGoodnight and Goodnight is a troglophile in Cuevade los Cuarteles, Tamaulipas.Troglostygnopsis anophthalma SilhavyTroglostygnopsis anophthalma Silhavy, 1974:176,182, 184, fig. 3(14-20); Sbordoni et al., 1974:32,34,45, pI. 5(fig. 13) (nomen nudum).Type.locality.-Grutas de Rancho Nuevo, S. Cristobalde las Casas, Chiapas, Mexico.Distribution.-Known from three caves in centralChiapas. See Fig. 50.Records.-Chiapas: Cueva de la Golondrina, Cuevadel Nacimiento del Rio Santo Domingo, and Grutasde Rancho Nuevo.Discussion.-This species is most closely related toT. inops. Eyes are absent. Like T. inops and H. planus,T. anophthalma is known only from high elevationcaves.Troglostygnopsis inops (Goodnight and Goodnight)Hoplobunus inops Goodnight and Goodnight, 1971:40-41, fig. 17; Reddell and Mitchell, 1971b:188,fig. 13; Goodnight and Goodnight, 1973:87, 90,fig. 7; Mitchell and Kawakatsu, 1973a:671;Mitchelland Reddell, 1973b:cover; Reddell, 1973a:34,39; Reddell and Elliott, 1973b:181, 184.Troglostygnopsis inops: Silhavy, 1974:176, 184,185,fig. 4(21).Type.locality.-Sotano de la loya de Salas, 21 kmNW of Gomez Farias, Tamaulipas, Mexico.Distribution.-Known only from caves in theSierra de Guatemala, Tamaulipas. See Fig. 50.Records.-Tamaulipas: Cueva de la Capilla, Sumiderode EI lineo, Sotano de la loya de Salas, Cuevade la Mina, Cueva del Ojo de Agua de Manantiales,and Sotano de Vasquez.Discussion.~This eyeless species is considered bySilhavy (1974) to be most closely related to T.anophthalma. A record of T. inops from Cueva delNacimiento del Rio San Antonio, Oaxaca (Goodnightand Goodnight, 1973), is doubtless in error. The tworegions share no other cave species in common, andany resemblance is probably due to convergence. TheOaxacan species is presumably an undescribed troglobite.Suborder PalpatoresFamily NemastomatidaeOrtholasma sbordonii SilhavyOrtholasma sbordonii Silhavy, 1974:176, 191, 193,fig. 7(43-49).Type-Iocality.-Cueva de la Perra (=Cueva de laCapilla), Sierra de Guatemala (Gomez Farias), Tamaulipas,Mexico.Distribution.-Known only from two caves in theSierra de Guatemala, Tamaulipas. See Fig. 49.Records.-Tamaulipas: Cueva de la Capilla andCueva de la Mina.Discussion.-Ortholasma has been erroneouslyplaced in the Trogulidae in the past; it clearly belongsin the Nemastomatidae, though probably in a newsubfamily also including Dendrolasma of Oregon andWashington and Cladolasma of Japan. Epigean speciesof Ortholasma are known from Oregon south tosouthern California, and from central Mexico, wherethe genus has been described under the synonym Trilasma(W. A. Shear, pers. comm.). The function ofthe peculiar cuticular sculpture of Ortholasma speciesappears to be the accumulation of dirt for purposesof camoflage. In O. sbordonii the dirt also covers thedepigrnented eyes.166