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this is almost certainly M. russelli. Specimens havebeen taken from moist cave walls with a fine layerof washed-in silt, from wet flowstone with smallamounts of bat guano on it, and from silt floors.Family SpirostreptidaeThe only genus of spirostreptid known from cavesin this area is Orthoporus. In addition to the twotroglobites discussed below, this genus is representedin caves in Mexico by five species (see Fig. 63).Orthoporus fraternus (Saussure) is a guanophile inGrutas de Zapaluta and Sumidero del Camino, Chiapas;O. guerreronus (Chamberlin) has been collectedin Grutas de Juxtlahuaca, Guerrero; O. solicolensChamberlin is an abundant troglophile in the caves ofCampeche and Yucatan; O. yucatanensis Causey israrely collected in caves in Campeche and Yucatanand is probably an accidental; and O. mimus Chamberlinis a troglophile in caves in San Luis Potosi andTamaulipas (Causey, 1975a). Orthoporus disc rim i­nuns Chamberlin has been collected in Grutas de Lanquin,Alta Verapaz, Guatemala (Causey, 1960).Nicholas (1962) lists O. guerreronus as a troglobite,but this species is probably a guanophile. Numerouscollections of this genus from many caves throughoutMexico await study.Orthoporus spelaeus CauseyOrthoporus spelaeus Causey, 1977:167, 176, 178,180, fig. 16-19; Reddell, 1977b:233, 239, 240,256.Type-Iocality.-Cenote de Catzin, Catzin, nr.Valladolid, Yucat