PROC. BIOL. SOC. WASH. 106(3), 1993, pp. 490-496 A NEW SPECIES OF BENTHANA BUDDE-LUND FROM BRAZILIAN CAVES (CRUSTACEA; ISOPODA; ONISCOIDEA) Idalina Maria Brasil Lima and Cristiana Silveira Serejo Abstract. — Benthana iporangensis, a new species of terrestrial isopod inhab-iting caves of Sao Paulo, Brasil, is described, figured and compared with the closest species: Benthana longipenis and Benthana santosi. The position of the "noduli laterales" is presented for the three species here studied. Many studies (Jackson 1926; Van Name 1936; Verhoeff 1941; Verhoeff 1951; Gru-ner 1955; Lemosde Castro 1958, 1985) have contributed to the knowledge of the genus Benthana Budde-Lund, 1908. Lemos de Castro (1958b) reviewed the genus, described seven new species and pro-vided a detailed redescription and a key for all hitherto known species. He described two additional new species, B. moreirai and B. dimorpha (1985). The genus Benthana Budde-Lund, 1908 resembles Ctenoscia Verhoeff, 1917, Ben-thanoides Lemos de Castro, 1965 and Ben-thanops Barnard, 1932, in having inner ctenate teeth on outer lobe of maxillula. Benthana is easily distinguished by the presence of a sharp curved tooth on the lat-eral margin of male first exopodite of pleo-pod. A new species of the genus Benthana is here described based on specimens collect-ed in Brazilian caves. A diagnosis of the genus is also presented. Benthana Budde-Lund, 1908 Diagnosis.— CQ^phdilon frontal line not visible, lateral lobes small, suprantennal line very prominent. Eyes small with numerous ommatidea. Mandibles with three penicilli on the right appendage and two on the left. Outer lobe of the maxillula with four simple outer spines, five large ctenate ones and a small and simple one. Endite of maxilliped with an anterior and a posterior spine and several short teeth at distal margin. Pleon abruptly narrower than pereion. Exopodites of the first male pleopod provided with a sharp, curved tooth on posterior margin. Endopodites of second male pleopod with a distal extremity very slender and long. Telson triangular, with sides straight or slightly sinuous, extremity subacute. Both rami of the uropods inserted at same level or very close, always posterior to tip of tel-son. In some species sexual dimorphism in pereopods 1-3 and 7 and in the proportions of uropods exopodites and endopodites, longer in male than in female. Type species.— Benthana picta (Brandt, 1833). Benthana iporangensis, new species Figs. 1-4 Type material. —Mnseu Nacional collec-tion. Iporanga, Sao Paulo— Aguas Quentes Caves: 2 66 and 3 99, Eleonora Trajano leg., November 1983, 1 6 Holotype MN 239.MI; 1 6 and 3 99 Paratypes MN 240.MI; 1 <5, L. Ishibe leg., August 1978, Paratype MN 24 1 .MI— Areias de Cima Caves: 1 6, E. Tra-jano leg., November 1983, Paratype MN 242. MI; 1 6, E. Trajano leg., September 1985, Paratype MN 243.MI— Areias de Baixo Caves: 1 9, E. Trajano leg., February 1985, Paratype MN 244.MI. Description.— Adult male: 6.4-8.6 mm. Body subconvex 3.3 times as long as broad.