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the Mediterranean region: three are troglobites, oneis marine, and two are epigean fresh-water species.Sphaeromicola moria Hart is a troglobite knownfrom Cirolanides texensis Ulrich in Rambie's Cave,Uvalde County, Texas (Hart, 1978).Sphaeromicola coahuiltecae Hobbs and HobbsSphaeromicola coahuiltecae Hobbs and Hobbs, 1973:41, fig. lc-g; Hart and Hart, 1974: 15, 165, pI.XLIlI(fig. 15-18), LXI; Hart, 1978:724, 725, 728,729, fig. I.Type-locality.-Cueva del Huisache, 4 km NW Micos,San Luis Potosi, Mexico.Distribution.-Known only from the type-locality.See Fig. 5.Discussion.-The host of this species is not knownwith certainty. It was taken from sediment in a jarcontaining four species of aquatic isopod: MexistenasellusparzeJalii Magniez, M. wilkensi Magniez,Mexilana saluposi Bowman, and an undescribed speciesof Cyathura. Since all other Mexican records forSphaeromicola are from cirolanids, it is probablethat Mexilana saluposi is the host for this species.Subclass BranchipodaOrder CladoceraFamily ChydoridaeThe only species of this family known from Mexicancaves is Alona sp.; it was found in Cueva de LosSabinos, San Luis Potosi (Osorio Tafall, 1943).1 ,.,.~( "I ,MEXICOGUATEMALA/.//r\,.... r'-"Fig. 5.-Distribution of troglobitic ostracods of the family Entocytheridae: 1, Sphaeromicola cirolanae; 2, S. coahuiltecae.83