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Rossi and Cesari Rossi (1977) described the ascomycetefungus Laboulbenia sbordonii as a parasite of M.intermedius.Mexaphaenops prietoi BolivarMexaphaenops prietoi Bolivar, 1942:351, 352, 353­354, fig. 1-6; Bolivar, 1944:26; Barr, 1967a:65-66;Barr, 1967d:161, 162,164, 165; Reddell, 1967a:24; Barr, 1968b:182-183; Barrera, 1968:309;Barr, 1971:113, 116; Laneyrie, 1971:192; Reddell,1971b:61; Vigna Taglianti, 1972:118, 124,125, 126, 127, fig. 5; Erwin et al., 1977:24; VignaTaglianti, 1977:326,333.Mexicaphaenops prietoi: Anonymous, 1942b:265(erroneous spelling).Mexaphaenops: Barr, 1966b:97; Vandel, 1964:237;Vandel, 1965a:199.Type-locality.-Grutas del Palmito, Bustamante,Nuevo Leon, Mexico.Distribution.-Known only from the type-locality.See Fig. 78.Discussion.-This is the rarest species of the genusand is known only from a few specimens. Barr(1967d) considers this to be the most highly apomorphicspecies in the genus.Paratrechus (Hygroduvalius) pallescens BarrTrechine (part): Barr, 1967a:66.Paratrechus (Hygroduvalius) pallescens Barr, 1967d:161-162, 165, fig. 1,4; Reddell, 1971b:61; VignaTaglianti, 1972:118; Reddell, 1973a:41; Mateu,1977:192, 194; Vigna Taglianti, 1977:326, 332Trechini: Reddell, 1967d:l06.Paratrechus new species: Barr, 1968b:183.Paratrechus (Hygroduvalius) pallescans: Reddell,1973a:35 (erroneous spelling).Paratrechus pallescens: Erwin et al., 1977:24.Paratrechus (Hygroduvalius) pallens: Mateu, 1977:200,206 (erroneous spelling).Type-locality.-Sotano de Tejamanil, 4.5 km westof Pinal de Amoles, Queretaro, Mexico.Distribution.-Known from four caves in Queretaro.See Fig. 78.New records.-Quenitaro: Sotano del Buque, SOtanode la Escuela, and Cueva del Judio (det. T. C.Barr, Jr.).Discussion.-This species is most closely related toParatrechus (Hygroduvalius) sylvaticus Bolivar, aneyed species from Morelos and the Distrito Federal.Paratrechus (H.) pallescens may represent a furtherlink in the series running from the robust, large-eyedspecies of Paratrechus (s. str.) to the elongate, anophthalmicspecies of Mexaphaenops (Barr, 1967d). Thisspecies has been taken from moist flowstone andfrom under rotten wood. An apparently troglobiticspecies of Paratrechus (s. str.) has recently been collectedfrom Cueva del Volcancillo, Veracruz, butremains undescribed. Two other species of Paratrechus(s. str.) have been taken from caves in Mexico(see Fig. 78): P. mexicanus Putzeys from Cueva de laCascada, Veracruz and P. tepoztlanensis Bolivar fromGrutas del Mogote, Guerrero, and Cueva de Coatepec,Mexico. Rossi and Cesari Rossi (1977) reported thatP. tepoztlanensis was parasitized by the ascomycetefungus Rhachomyces quetzalcoatl Balazuc in Cuevade Coatepec. They also report this same fungus as aparasite of an undetermined species ofParatrechus inResumidero Grande and Resumidero de Chemal,Huehuetenango, Guatemala. Mateu (1977) describedthe genus Mexitrechus to include P. coarctatus Bates.This species has been recently found in Sotano de lasBellotas and Comedor del Diablo, Oaxaca (see Fig.78).Platynus (Mexisphodrus) profundus (Barr)Mexisphodrus profundus Barr, 1966a:113-U4, US;Barr, 1967a:66; Reddell, 1967c:55; Barr, 1968b:184; Reddell, 1971b:61; Reddell and Mitchell,1971b:193, fig. 18; Vigna Taglinati, 1972:125;Hendrichs and Bolivar, 1973:38, 41; Mitchell andKawakatsu, 1973a:671; Reddell, 1973a:36, 41;Reddell and Elliott, 1973b:182; Vomero, 1974:353.Mexisphodrus sp.: Hendrichs and Bolivar, 1966:7(Tamaulipas record only).Mexisphodrus new species: Reddell, 1966a:13.Mexisphodrus: Sbordoni and Argano, 1972:8 [Cuevade la Perra (=Capilla) record only]; Peck, 1973c:129.Platynus profundus: Whitehead, 1973: 185, 207; Erwinet al., 1977:31.Type-locality.-Sotano de la Joya de Salas, 25 kmwest of Encino, Tamaulipas, Mexico.Distribution.-Known from caves in the Sierra deGuatemala, Tamaulipas. See Fig. 76.Records.-Tamaulipas: Sinkhole at Rancho delCielo, Cueva de la Capilla, Crystal Cave, HarrisonSinkhole, Sotano de la Joya de Salas, and Cueva de laMina.Discussion.~Five species have been described inMexisphodrus, all known only from caves. Of these,three are presumably troglobites and are includedhere. Of the remaining species, one (M. tlama.yaensisBarr from caves in Queretaro, San Luis Potosi, and223