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Hoplobonus boneti: Sbordoni et al., 1974:37 (erroneousspelling).Type-Iocality.-Cueva de Los Sabinos, San LuisPotosi, Mexico.Distribution.-Known from many caves in theSierra de El Abra, San Luis Potosi and Tamaulipas;and possibly from one cave in the Sierra de Guatemala,Tamaulipas. See Fig. 50.Records.-San Luis Potosi: S6tano de Coatimundi,Cueva de la Curva, S6tano de Matapalma, Cueva delos Monos, S6tano de Pichijumo, Cueva Pinta, S6tanode la Pipa, Cueva de Los Sabinos, S6tano de Soyate,Cueva de Tanchipa, S6tano del Tigre, S6tano de laTinaja, Cueva de Valdosa, and S6tano de Yerbaniz;Tamaulipas: ?Cueva del Remolino and S6tano de ElVenadito.New records.-San Luis Potosi: Cueva de los Cuatesand S6tano de las Piedras (det. C. J. Goodnight).Discussion.-This species is one of the more obviousspecies in the cave fauna of the Sierra de ElAbra. When present, it is usually abundant. It hasnever been found in the caves of the northern Sierrade El Abra, apparently reaching its northern limit ofdistribution in S6tano de El Venadito, immediatelynorth of the San Luis Potosi-Tamaulipas state line.The single record from a high elevation cave in theSierra de Guatemala (Cueva del Remolino) is a possibleerror in identification or curation; additionalcollection is needed to verify this record. Individualsof this species are occasionally found guarding eggsor young (Mitchell, 1971a). Although some specimenspossess eyes, others are eyeless, and in all theeyes are reduced and probably non-functional.Hoplobunus osorioi (Goodnight and Goodnight)Chinquipellobunus osorioi Goodnight and Goodnight,1944:1, 3, fig. 4-9; Bolivar, 1944:26; Goodnightand Goodnight, 1945:3; Reddell, 1967a:24.Chipinquelobunus osorioi: Bonet, 1946a: 115 (erroneousspelling).Chinquepellobunus: Goodnight and Goodnight,1953:20.Hoplobunus: Goodnight and Goodnight, 1953:20.Hoplobunus osorioi: Reddell, 1971b:35.Type-locality.-Gruta del Carrizal, Nuevo Le6n,Mexico.Distribution.-Known only from three caves inNuevo Le6n. See Fig. 50.Records.-Nuevo Leon: Cueva del Carrizal, Grutasdel Palmito, and Grutas de Villa de Garcia.Discussion.-This species has greatly reduced,probably non-functional eyes. Each of the three cavesfrom which it is recorded is located in an isolatedlimestone range in the Northern Basin and RangeProvince. The lack of divergence and the retentionof eye remnants imply that this is a comparativelyrecent troglobite. This species was found in largenumbers along the stream passage in Cueva del Carrizal.Geographically close members of the genus areH. russelli Goodnight and Goodnight and H. madlaeGoodnight and Goodnight, both of which are troglobitesfrom Central Texas.Hoplobunus planus Goodnight and GoodnightHoplobunus planus Goodnight and Goodnight, 1973:88, 90, fig. 9.Type-Iocality.-Cueva de San Nicolas, 10 km SWAquism6n, San Luis Potosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 50.Discussion.-This eyeless species is apparentlymost closely related to Troglostygnopsis inops and, ifthe genus Troglostygnopsis is valid, this species maybelong to it. The genus Hoplobunus includes threeother cave-associated species, all of which are probablytroglophiles. Hoplobunus mexicanus (Roewer)has been found in one cave each in Oaxaca and Tamaulipas;H. spinoocularum Goodnight and Goodnightis a distinctive species found in abundance on thewalls and floor of Cueva del Guyabo, Oaxaca; and H.oaxacensis Goodnight and Goodnight was collectedfrom the walls and rocky floor areas of Cueva delLlano Grande and S6tano de los Arboles, Oaxaca.Hoplobunus queretarius SilhavyHoplobunus queretarius Silhary, 1974:176,179,180,182, fig. 2; Silhary, 1977:223.Type-Iocality.-Cueva del Madroiio, El Lobo, Queretaro,Mexico.Distribution.-Known from two caves in Queretaro.See Fig. 50.New record.-Queretaro: El Socav6n (det. C. J.Goodnight).Discussion.-This yellowish brown species apparentlyhas the eyes greatly reduced and probablylacking the retina. It is most closely related to H.zullinii from Chiapas.Hoplobunus zullinii SilharyHoplobunus zullinii Silhavy, 1977:219, 220-223, fig.1-9.Type-Iocality.-Grutas de Llano Grande, LlanoGrande, La Grandezza, Huixtla, Chiapas, Mexico.Distribution.-Known from two caves in Chiapas.See Fig. 50.165