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maya Chamberlin and Ivie from Campeche, QuintanaRoo, and Yucatan; M. placida Gertsch from NuevoLeon and Tamaulipas; M. tinaja Gertsch from SanLuis Potosi and Tamaulipas; M. yucatana Chamberlinand Ivie from Campeche and Yucatan; and At. blandaGertsch from Izabal and Alta Verapaz, Guatemala.Undescribed troglobites and troglophiles are knownfrom caves in Puebta and Veracruz.The genus Pholcophora is also well represented inthe caves of Mexico and Guatemala (Chamberlin andIvie, 1938b; Gertsch, 1971a, 1977b) (see Fig. 42).Three species are considered to be troglobites and arediscussed below. The remaining nine species are troglophiles:P. bispinosa Gertsch and P. evansi Gertschfrom Chiapas; P. bolivari Gertsch and P. mitchelliGertsch from Tamaulipas; P. elliotti Gertsch from SanLuis Potosi; P. maria Gertsch from Yucatan; P. speophila(Chamberlin and Ivie) from Campeche andYucatan; P. troglodyta Gertsch from Veracruz; andP. quieta Gertsl:h from Izabal, Guatemala. Undescribedspecies of the genus, including four troglobites,are known from caves in Oaxaca, Puebla, Veracruz,and Campeche.The genus Psilochorus is known from caves inMexico from near the border of the United States toGuerrero and Oaxaca (see Fig. 43). Two species aretentatively considered to be troglobites and are discussedbelow. The remaining six species are probableGUATEMALA..--'-'-'-'I/i\.I),.. ..-"/.//r\r·Fig. 37.-Distribution of troglophilic pholcid spiders of the genus Physocyclus: 1, Physocyclus enaulus; 2, P. hoogstTaali;3,P. pedregosus; 4,P. merus; 5,P. reddelli; 6,P. globosus; 7, P. lautus and P. validus; 8, P. modestus; 9, P. bicomis.148