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las Perlas, Cueva Chica de la Perra, ?Cueva del Ranchodel Cielo n. 3, Cueva del Rancho del Cielo n. 7, Cuevadel Remolino, Sotano de Tres Cerritos, Cueva del Ojode Agua de Manantiales, 2,000 Meter Cave, Sotano deVasquez, and ?Wet Cave.Discussion.-This large, delicate species ranges incolor from a pale blue-green to pure white. It is amajor element of the cave fauna of the Sierra de Guatemala.Retention of pigment in some individuals indicatesthat it is a fairly recent troglobite. It is frequentlyabundant on silt and moist flowstone. A large,epigean species, S. conspicuus Causey, is abundant onthe surface and is occasionally collected in the entranceareas of caves in the Sierra de Guatemala andSierra de El Abra. A second epigean species, S. potosianus(Chamberlin), is known from Sumidero de Fantasmas,San Luis Potosi. The genus Strongylodesmusranges from Veracruz to Tamaulipas and containseight species.Unculabes arganoi ShearUnculabes arganoi Shear, 1974:264, 265, 267,268,269, fig. 39-44.Type-locality.-Cueva del Madroiio, El Lolo (=EILobo), Queretaro, Mexico.MEXICO~,\\: I',;-"\_1- '--~. __._._.G;'.//--....... I IL\.r/ '-\._i I\"'\"..'\ i\'...,II_____' I-I//,iIjrGUATEMALAFig. 59.-Distribution ottroglobitic and troglophilic rhachodesmid miIlipeds of the genus Strongylodesmus: 1, Strongylodesmwharrisonij 2, S. harrisoni and S. conspicuus; 3, S. conspicuusj 4, S. potosianus.186