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estricted to the Mexican Plateau (see Fig. 37). Nicholas(1962) lists P. hoogstrlUlli Gertsch and Davis as atroglobite, but it like all species of the genus is presumablya troglophile. Physocyclus is also usuallyfound hanging in webs in the vicinity of the cave entrance.Although its distribution overlaps that ofCoryssocnemis, the genus seems to be more commonlyfound in caves in the arid regions of Mexico. Elevenspecies have been reported from Mexican caves: P.bicornis Gertsch and P. modestus Gertsch from Guerrero;P. enaulus Crosby from Chihuahua and Coahuila;P. globosus (Taczanowski) from Chiapas, SanLuis Potosi, Veracruz, and Yucatan; P. hoogstraaliGertsch and Davis from Coahuila and Nuevo Leon; P.lautus Gertsch and P. validus Gertsch from Colima; P.merus Gertsch from San Luis Potosi; P. pedregosusGertsch from Coahuila; P. reddelli Gertsch from Hidalgo,Queretaro, and San Luis Potosi; and P. tanneriGertsch from Sonora.The genus Modisimus includes 12 described specieswhich have been identified from caves in Mexico andGuatemala (Gertsch, 1971a, 1973b; Brignoli, 1974b):M. beneficus Gertsch from Veracruz; M. bonetiGertsch and M. texanus Banks from San Luis Potosiand Tamaulipas; M. iviei Gertsch from Quintana Roo,Tabasco, and Yucatan; M. mckenziei Gertsch, M.mitchelli Gertsch, and M. reddelli Gertsch from Tamaulipas;M. propinquus O. P.-Cambridge and M.MEXICOGUATEMALA/r·\,....".-'//Fig. 35.-Distribution of troglophilic and troglobitic spiders of the family Oonopidae: 1, Triaeris patellaris; 2, Oonopschi£keringij 3, O. coeCUSj 4, O. mitchellij 5, O. reddelli; 6, T. lacandonus.146