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Type-locality.-Harrison's Sinkhole, Rancho delCielo, Tamaulipas, Mexico.Distribution.-Caves in the southern Sierra de Guatemala,Tamaulipas. See Fig. 62.Records.-Tamaulipas: Bee Cave, Crystal Cave,Sotano de Gomez Farias, Harrison Sinkhole, Sumiderode EI lineo, Sotano del Leon, Sotano del Molino,Cueva del Nacimiento del Rio Frio, Cueva dela Paloma, Grutas de EI Puente, Cueva del Remolino,Sotano de Tres Cerritos, and Sotano de Vasquez.Discussion.-The genus Mexicambala is composedonly of the four troglobitic species listed here.Causey (1971a) considers this species, together withM. inopis and M. russelli, to comprise the russellisuperspecies. They have contiguous ranges and arevery closely related.Mexicambala fishi CauseyMexicambala fishi Causey, 1971a:272, 275, 280,fig. Ie, 2d, 4; Reddell, 1973a:35, 40.Type-locality.-Cueva Arriba de Rio Iglesia (=SOtanodel Rio Iglesia), 4 mi. E Huautla, Oaxaca,Mexico.Distribution.-Known only from the type-locality.See Fig. 62.Discussion.-This species is most closely related toIVI. russelli. With the exception of the aberrant }armilkaalba, this represents the southern limit of distributionof the Cambalidae in 1exico.Mexicambala inopis CauseyMexicambala russelli undescribed subspecies: Reddell,1967c:55 (Sotano de la loya de Salas and Cuevade los Leones records only); Reddell, 1971b:47(Sotano de la loya de Salas and Cueva de los Leonesrecords only).Mexicambala sp.: Reddell and Mitchell, 1971b:190(Cueva de la Capilla, Sotano de la loya de Salas,and Cueva de los Leones records only); Mitchelland Kawakatsu, 1973a:673.Mexicambala inopis Causey, 1971a:272, 275, 276,278, 279, fig. Ib; Causey, 1973:122; Reddell,1973a:35, 40; Reddell and Elliott, 1973b:182,185; Shear, 1974:250.Type-locality.-Sotano de la loya de Salas, W ofRancho del Cielo about 6 mi., Tamaulipas, Mexico.Distribution.-Known from caves in the northernSierra de Guatemala, Tamaulipas. See Fig. 62.Records.-Tamaulipas: Cueva de la Capilla, Sotanode la loya de Salas, Cueva de los Leones, and Cuevade la Mina.Discussion.-This species occurs to the north ofand at higher elevations than M. blanda. The evolutionin the same area of two species as closely relatedas are M. blanda and M. inopis is somewhat difficultto explain. The epigean ancestor may have becomeextinct in the higher, more northern part of theSierra de Guatemala before it did so in the lower,southern area. The higher areas are generally pineforest and are drier than the cloud forest at the lowerelevations of the range of M. blanda. In the UnitedStates the Cambalidae generally prefer wet litter habitats,and we would assume the epigean ancestor ofMexicambala to have had a similar preference. Causey(1971a) speculates that Mexicambala moved southalong the eastern slopes of the Sierra Madre Orient: