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Distribution.-Known only from the type-locality.See Fig. 12.Discussion.-This species was taken in direct associationwith M. colei. Holsinger (in press) now considersthis species to belong to a separate, distinctgenus, more primitive in a number of characters thanMexiweckelia.Family HyaleUidaeThe only species in the family Hyalellidae knownto inhabit caves in Mexico is Hyalella azteca (Saussure).This ubiquitous species ranges through much ofthe United States south to Peru. It has been collectedin cenotes and caves in Yucatan (Creaser, 1936) andfrom caves in Campeche, Chiapas, ;vlichoacan, SanLuis Potosi, and Tamaulipas.Family MelitidaeQuadravisio lutzi (Shoemaker) is the only speciesin the family lVlelitidae known from ;\lexican caves. Itwas collected from brackish water in Cenote de Tulumand Cueva de Tancah, Quintana Roo. Otherwise,it is known only from brackish and freshwater localitiesalong the northwest coastal area of Venezuela,Guayana, and Brazil.Order MysidaceaThe order Mysidacea is represented Il1 subterraneanwaters by at least 17 species. Two of these areknown only from crao burrows, hut the remainingspecies are probable tro/llohites. They are knownfrom Zam:ibar, Italy, India, the Canary Islands, Herzegovina,the An tilles, Costa Rica, Colombia, Peril,and Mexico. All are apparently of marine origin (Vandel,1964). Four species in two families have heencollected from caves in \l(~xico and are all troglobites.Family LepidomysidaeSpelaeomysis olivae BowmanSpelaeomysis oiivae Bowman, 1973:14, 17, fig. 1-11,13-19; Hobbs, 1973L:73; Bowman, 1977a:149­150; Hobbs et al., 1977:52,67.Type-Iocality.-Cueva del Nacimiento del Rio SanAntonio, 10 km SSW Acatlan, Oaxaca, Mexico.Distribution.-Known only from the type-locality.See Fig. 13.Discussion.-The genus Spelaeomysis includesseven species, all of which are known from subterraneanhabitats. These have been reviewed by Bowman(1973). Speiaeomysis olivae is most closely related toS. quinterensis. It was collected from clear, siltflooredpools in association with blind shrimps (Aipheopsisstygicoia and J;Jacrobrachium villaiobosi).Spelaeomysis quinterensis (Villalobos)Typhlolepidomysis quinterensis Villalobos, 1951:191-218, fig. 1-14; Rioja, 1953a:290, 291, 293,294; Rioja, 1953e:11, fig. 1; Gordan, 1957:337;Delamare Deboutteville, 1960:644; Gordon, 1960:299; Rioja et al_, 1961:315; Nicholas, 1962:168;Rioja, 1962:40; Vandel, 1964:147; Reddell,1965a:19; Vandel, 1965a:118; Straskraba, 1969:24; Nath and Pillai, 1971:285; Paclt, 1971:424;Sbordoni and Argano, 1972:9; Bowman, 1973:13.Typhlolepidomysis: Martin and Martin, 1954:584;Gordon, 1960:297, 301, 304, 305, 307, 308,309; Pillai and Mariamma, 1964:113; Nath andPillai, 1971:285,286,287.Spelaeomysis quinterensis: Gordon, 1960:308; Pillaiand Mariamma, 1964:113, 122, 123; Bacescu andOrghidan, 1971:225,229,230; Rioja, 1971:503;Bowman, 1973:14, 17, fig. 12, 20; Reddell andElliott, 1973a:I71, 173; Reddell and Elliott,1973b:181, 183; Bowman, 1977a:149-150.Speleomysis quinterensis: Reddell, 1967b:82; Elliott,1971:10; Reddell, 1971b:24; Reddell and Mitchell,1971a:143, fig. 11; Reddell and Mitchell,1971b: 184 (erroneous spelling).Lepidomysis quinterensis: Nath and Pillai, 1971:286,287; ath et al., 1972:53.Blind mysidaceans: Reddell, 1973b:77.Type-Iocality.-Grutas de Quintero, Tamaulipas,\Iexico.Distribution.--Caves in the Sierra de El Abra, SanLuis Potosi and Tamaulipas. and the Sierra de Guatemala,Tamaulipas. See Fig. Vl.Records.-San Luis Potosi: Si>tano de la Tinaja;Tamaulipas: Bee Cave and Grutas de Quintero.New record.-San Luis Potosi: S6tano del Toro(del. T. E. Bowman).Discussion.-In addition to the two troglobiticspecies of the genus listed here, a related species, S.nllniezi Bacescu and Orghidan, is known from cavesin CuLa. This species is certainly more abundant inthe caves of the Sierra Je ~I Abra and Sierra de Guatemalathan the four above records indicate. In Gmtasde Quintero hundreds of inJividuais have beenseen to cluster abou t small pieces of rotten wood inlarge travertine pools fed by a seasonal spring. Onlyone individual has been collected from each of theother caves.Family MysidaeAntromysis (Antromysis) cenotensis CreaserSchizopods: Pearse, 1933:110.Antromysis cenotensis Creaser, 1936:121-123, 131,fig. 13-24; Pearse, 1936c:24; Creaser, 1938:159,103