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Type-Iocality.-Of Porcellio pearsei: Balaam CancheCave (=Grutas de Balankanche), near ChichenItza, Yucatan, Mexico; of Trichorhina yucatanensis:Cueva de Gorgosa (=Actun Gongora), Oxkutzcab,Yucatan, Mexico.Distribution.-Known from seven caves in Yucatan.See Fig. 9.Records.-Yucatan: Gru tas de Balankanche, ActlInGongora, Actun Puz, Cenote de Sambula (l\lotul),Cueva Primera del Camino a San Roque, Actun Sazich,and Actun Xpukil.Discussion.--This is an eyeless species hut mayprove to be an endogean form. One eyeless epigeanspecies, T. xoltumae Mulaik, is known from Xoltum,Yucatan (Mulaik, 1960). :'iumerous collections ofcave and epigean isopods from the Yucatan Peninsulaare now under study by Dr. George A. Schultz.Further speculation on the ecologic status of thisspecies is premature.Family TrichoniscidaeBrackenridgia acostai (Rioja)Protrichoniscus acostai Rioja, 195Ih:181-189, fig. 1­23; Rioja, 1953a:290, 291, 295: Rioja, 195::3b:217; Rioja, ] 955b:49-53, 61. fig. 19-26; '\lulaik,1960:82, 100, 102-105, fig. 552-570; l\icholas,1962: 172; Vandel, 1965c:352, :l5~, fig. I.Protrichoniscus (part): Rioja, 1953e: 11.Protrichonischus acostai: Rioja, 1955a:208 (erron(~ousspelling).Brackenridgia acostai: Keddell, 1971b :23.Type-Iocality.-Cueva de toma de ai,rtla para lapoblacion de Comitan (=Cueva del Tio Ticho), Chiapas,Mexico.Distribution.-Known from two caves near Corn i­tan, Chiapas. See Fig. 10.Records.-Chiapas: Cueva dcl Tio Ticho and Gmtasde Zapaluta.Discussion.-The genus Brackenridgia is a memherof the First Division of the subfamily Trichoniscinae.This division is considered by Vandel (1965c) to bethe most primitive. Members of it are found in Europeand North America. Brackenridgia includeseight species, seven of which are troglobites. Theeighth, B. heroldi (Arcangeli), is known only fromcaves and epigean localities in California (U.S.A.).Two species, B. cavernarum Ulrich and B. reddelli(Vandel), are known only from caves in Texas.Brackenridgia bridgesi (Van Name)Protrichoniscus bridgesi Van Name, 1942:299,302­304, fig. 4-5; Bolivar, 1950:211; Rioja, 1950:127-137, 138, 140, 141, 143, fig. 1-20; Vandel,1950:206, 207; Rioja, 1951b:183, 184, 187,188; Villalobos, 1951:215; Bonet, 1953a:27,30;Rioja, 1953a: 287, 289, 291, 295; Vandel, 1953:371, 372; Rioja, 1955b:39-44, 46, 53, 61, fig.1-10; Mulaik, 1960:100, 101-102, 103, 104, 105,106, 107, 108, 109, 110, fig. 27-38; Nicholas,1962:172; Reddell, 1965a:19; Vandel, 1965c:353, 354, 360-364, 366, fig. 1, 5-6; Reddell,1967b:82; Schultz, 1968:256-257, fig. 3, 6, 9,12,15,18,21,26-27; Schultz, 1970a:412.Protrichoniscus (part): Rioja, 1953e:ll, fig. 7.Protrichoniscus potosinus Mulaik, 1960:100-10],fig. 21-26; Nicholas, 1962:172; Bowman, 1965:212; McKenzie, 1965a:38; Vandel, 1965c:353,354,360.Brackenridgia bridgesi: Mitchell and Reddell, 1971:59; Reddell, 1971h:23; Reddell and Mitchell,1971a:143, fig. 9; Reddell and Mitchell, 1971b:183, fig. 1, 15; Mitchell and Kawakatsu, 1973a:671, 673, 675; Reddell and Elliott, 1973a:171;Reddell and Elliott, 1973b:181; Fernandez Ruiz,1976:716, 717; Johnson and Heath, 1977:131­135.Type-Iocality.-Of Protrichoniscus bridgesi: Caveat El Pujal (=Cueva Chica), San Luis Potosi, Mexico;of Protrichoniscus potosinus: Cueva Chica, El Pujal,San Luis Potosi, Mexico.DistributiolJ.-Known from caves in the Sierra deEl Abra, San Luis Potosi and Tamaulipas; and theSierra de Guatemala, Tamaulipas. See Fig. 10.Records.-San Luis Potosi: Boca del Ahra, Sotanodel Arroyo, Cueva Chica, Ventana Jahali, Cueva deLos Sabinos, Sotano del Tigre, and Sotano de laTinaja; Tamaulipas: ?Cueva de la Capilla, Cueva dela Mina, Cueva de El Paehon, and Grutas de Quintero.DiscussiolJ.-Boca del Abra is an unidentified localitybut may be the same cave as Cueva de Valdosa.This widespread species may also be found in a varietyof habitats, both terrestrial and aquatic. Individualshave been seen to walk though pools severalinches deep and even to be seen remaining underwater for long periods of time. It is usually collectedon small pieces of rotten wood, among bits of organicdebris washed into caves, or about small pools. Johnsonand Heath (1977) estimated the population sizein Cueva Chiea to be about 533 individuals. This speciesshows strong affinities with B. reddelli of CentralTexas (Vandel, 1965c).Brackenridgia palmitensis (Mulaik)Protrichoniscus palmitensis Mulaik, 1960:100, 102,fig. 39-48; Nicholas, 1962: 172; Bowman, 1965:212; Vandel, 1965c:353, 354; Reddell, 1967a:24.95