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Bowman, T .E. 1992. Two subterranean aquatic isopod crustaceans new to Texas: Mexistenasellus coahuila (Cole and Minckley, 1972)(Asellida, Stenasellidae) and Speocirolana hardeni, new species (Flabellifera: Cirolanidae). Texas Mem. Mus., Speleolol. Monogr.,3:23-30TWO SUBTERRANEAN AQUATIC ISOPOD CRUSTACEANS NEW TO TEXAS:MEXISTENASELLUS COAHUILA (COLE AND MINCKLEY, 1972) (ASELLOTA:STENASELLIDAE) AND SPEOCIROLANA HARDENI, NEW SPECIES(FLABELLIFERA: CIROLANIDAE)Thomas E. BowmanDivision of CrustaceaSmithsonian Institution NHB-163Washington, DC 20560ABSTRACTMexistenasellus coahuila is reported from wells and hyporheicwaters in Bexar and Medina Counties. lllustrations aregiven of selected features and differences from type materialfrom Coahuila, Mexico, are noted. Speocirolana hardeni, newspecies, is described from Bexar and Val Verde Counties; it issimilar to S. thennydronis, but has longer and more slenderpereopods and uropods.In this paper I add 2 species, one new, to theknown isopod fauna of Texas, and bring up to datethe records of Cirolanides texensis, which nownumber 24.STENASELLIDAE DUDICH, 1924Mexistenasellus Cole & Minckley, 1972Until now North American isopods of the familyStenasellidae have been reported only from Mexico,where 6 species of Mexistenasellus and 2 species ofEtlastenasellus are known to occur (summarized inBowman, 1982b). The northernmost of thesestenasellids has been found recently in southernTexas, as documented below.Mexistenasellus coahuila Cole and Minckley, 1972Figs. 1, 5aMexistenasellus coahuila Cole and Minckley, 1972: 315-320,figs. 1-31; Cole, 1984:8-9.Mexistenasellus sp.: Henry, Lewis, and Magniez, 1986:460.Material.-TEXAS: Bexar County: spring on Ebank of San Antonio River, 23 Oct. 1985 (Scott J.Harden), 2 males, 4 females (USNM 242471); 26Oct. 1985 (Scott J. Harden, D. Kern, C. Lindblom),1 male, 1 female (USNM 242472); Leon Creekpowerplant well no. 1, 30 July 1979 (R. Rutland), 1male (USNM 250357); well in Brackenridge Zoo,San Antonio, 3 Sept. 1976 (H. Karnei), 1 female(USNM 250358); 22 May 1981 (M. Brzozowski), 1female (USNM 250359); 10 June 1981, 1 male(USNM 250360). Medina County: hyporheic zone,Hondo Creek: 4 mi. E Hondo, spring 1986 (Scott J.Harden), 3 males, 6 females (USNM 250187); 12May 1987 (Scott J. Harden), 5 males, 8 females(USNM 250188); S of Highway 90, spring 1986(Scott J. Harden), 1 male, 8 females (USNM250189).Remarks.-Mexistenasellus coahuila was describedfrom thermal springs (> 30°C) of the Cuatro23