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30 m below entrance of Cueva de la Boca, near VillaSantiago.Discussion.-Sphaero/ana is one of three genera ofcirolanids capable of rolling into a ball, the other twobeing Faucheria and Creaseriella (see under Creaseriellaanops above). It appears to be only slightly relatedto either genus. The two species of the genus arequite secretive during the day but roam in the springmouths and in mud about plant roots in the bottomof the wells at night. Cole and Minckley (1970) discussthe evolution of the genus.Sphaerolana interstitia/is Cole and MinckleyAberrant cirolanid (part): Minckley, 1969:25.Sphaerolana interstitia/is Cole and Minckley, 1970:72-75, 76, 78-79, 80, fig. 1-27,40; Holsinger andMinckley, 1971:441; Reddell, 1971b:21; Brown,1974:44,45.Sphaerolana (part): Cole and Minckley, 1970:71-72;Cole and Minckley, 1972:32l.Type-Iocality.-Small, unnamed pit ca. 8.2 kmsouth and 4.7 km west of Cuatro Cienegas de Carranza,Coahuila, Mexico.Distribution.-Small springs and posos near CuatroCienegas, Coahuila. See Fig. 6.Records.-Coahuila: Small unnamed poso about8.2 km Sand 4.7 km W of Cuatro Cienegas; threesmall springs within 1 km W of this poso.Discussion.-One specimen of this species wastaken from the stomach contents of the aquatic boxturtle T~rrapene coahuila Schmidt and Owens(Brown, 1974). It has been taken in association withS. affinis in one poso (Cole and Minckley, 1970).Suborder AsellotaFamily AsellidaeThe family Asellidae is an extremely abundantpart of the cavernicole fauna of the temperate regionsof the United States, but until recently was notknown from Mexico. Five species of asellid, four ofwhich are troglobites, have been described from wellsand caves in southern Mexico: a single troglobitic speciesis known from a cave in Guatemala.Caecidotea chiapas BowmanCaecidotea chiapas Bowman, 1976:340-345, 354,355, fig. 1-39; Argano, 1977:103-105, 1l0, 112,114, 116; Ruffo and Vigna Taglianti, 1977:134,141; Sbordoni et aI., 1977:74, pI. lia.AseUi troglobi: Sbordoni et al" 1977:56.Type-Iocality.-Cueva de los Iurcielagos, 15 kmESE of San Cristobal de las Casas, Chiapas, Mexico.Distribution.-Known from four caves and a wellnear San Cristobal de las Casas, Chiapas. See Fig. 7.Records.-Chiapas: Well in casa Bell (San Cristobalde las Casas), Cueva de Los Llanos, Cueva- de los Murcielagos,Cueva de la Planta n. 2, and Cueva de laPlanta n. 3.Discussion.-This species is most closely related toC. pasquinii. It was taken from a small stream IIICueva de Los Llanos and Cueva de los Murcielagos.Caecidotea mitchel/i ArganoCaecidotea mitchelli Argano, 1977:112-116, fig. 5-6;Ruffo and Vigna Taglianti, 1977:146.Type-Iocality.-Cueva de los Resadores, Santa Eulalia,Huehuetenango, Guatemala.Distribution.-Known only from the type-locality.See Fig. 7.Discussion.-This species was taken from pools inassociation with Bogidiel/a pasquinii. It is a memberof the chiapas species group and appears to be closelyrelated to C. pasquinii.Caecidotea pasquinii (Argano)Conasel/us pasquinii Argano, 1972a:35-42, fig. 1-3;Bowman, 1976:339.Caecidotea pasquinii: Bowman, 1976:344, fig. 39;Argano, 1977:103, 112.Type-Iocality.-Well in the pueblo of San Joan(=Juan) de.la Punta, on the road between Veracruzand Cordoba, Veracruz, Mexico.Distribution.-Known only from the type-locality.See Fig. 7.Discussion.-This species is closely related to C.communis (Say), a widespread species known, inMexico, from the states of Mexico, Puebla, and Veracruz.Argano (1972a) considers that C. pasquinii is afairly recent troglobite, probably evolved from C.communis or a common ancestor. Creaser (1938)reported the presence in Gru tas de Balankanche,Yucatan, of an undescribable species of Caecidotea.Caecidotea vomeroi ArganoCaecidotea vomeroi Argano, 1977:110-112, fig. 4;Ruffo and Vigna Taglianti, 1977:13l.Type-Iocality.-Cueva de Chita! no. 2, Ococingo(=Ocosingo), Chiapas, Mexico.Distribution.-Known only from the type-locality.See Fig. 7.Discussion.-This species belongs to the chiI.Jpasspecies group and appears to be most closely relatedto C. zul/inii. It was taken i~ association with theamphipod Bogidie/la tabascl!tl.sis and troglobitic planaria.88