The genus Alterosa Blahnik, 2005 (Trichoptera, Philopotamidae, Philopotaminae) in northeastern Brazil, including the description of three new species and an identification key for the genus Author Dumas, Leandro Lourenco Author Calor, Adolfo Ricardo Author Nessimian, Jorge Luiz text ZooKeys 2013 317 1 15 http://dx.doi.org/10.3897/zookeys.317.5437 journal article http://dx.doi.org/10.3897/zookeys.317.5437 1313-2970-317-1 Alterosa amadoi sp. n. Figs 1 A-D Remarks. Alterosa amadoi sp. n. cannot be easily placed in any of the species groups defined by Blahnik (2005) . Alterosa amadoi sp. n. and Alterosa caymmii sp. n. share character similarities with Alterosa ruschii Dumas & Nessimian, 2013 and Alterosa spiesae Dumas & Nessimian, 2013, regarding the general structure of the branched intermediate appendages. However, unlike Alterosa ruschii and Alterosa spiesae , the 2 new species cannot be placed in or even near the Alterosa sanctipauli group because of the lack of a basal rounded protuberance on tergum X, with cuticle scabrously developed, and the absence of a crest-like process at the apex of tergum X. Alterosa amadoi sp. n. can be diagnosed by the overall shape of the intermediate appendages, especially the rod-like mesal branch with spines at its apex, and the inferior appendages with the 1st article short and nearly as wide as long. An additional diagnostically unique character for this new species is the dorsal spiny crest-like projection at midlength of tergum X. Description. Adult. Color (in alcohol) brown; legs, palps, and antennae pale brown, forewing pattern not discernible. Male forewings 5.6-6.4 mm (n=3). Male genitalia. Tergum VIII with posteromesal margin moderately emarginate; emargination U-shaped and extending no more than halfway to anterior margin. Sternum IX with anterolateral margin weakly rounded, subtruncate; posteroventral margin greatly produced, extending nearly linearly from dorsum (Fig. 1A). Tergum IX greatly reduced, membranous or fused to base of tergum X (Fig. 1B). Tergum X tapered from base in lateral view; dorsally with spiny crest-like projection at midlength; apex sensillate, subtruncate, slightly enlarged in lateral view (Figs 1A, 1B). Intermediate appendages heavily sclerotized, branched subbasally; mesal branch elongate, surpassing preanal appendages, rod-like, blunt and with small spines apically; lateral branch lobe-like, rounded, covered by spine-like setae, subacute apically in dorsal view, apex greatly enlarged and rounded as viewed laterally (Figs 1A, 1B). Preanal appendages elongate, club-like, covered with stiff, small setae; apex rounded with elongate subacuminate projection bearing small apical setae as viewed laterally and dorsally (Figs 1A, 1B). Inferior appendages robust, setose; 1st article, in lateral view, short, nearly as wide as long, bulging mesally; 2nd article longer than 1st article, relatively wide, base as wide as apex of 1st article, slightly enlarged apically and with small pad of short, stiff apicomesal setae (Figs 1A, 1C). Phallobase tubular, relatively short, slightly curved; endotheca without spines; phallotremal sclerites indistinct (Fig. 1D). Figure 1. Alterosa amadoi , new species, male genitalia. A left lateral view B dorsal view (setae of left lateral branch of intermediate appendages omitted) C left inferior appendage, dorsal view D phallic apparatus, left lateral view. Abbreviations: inf. app. - inferior appendage; int. app. - intermediate appendage; pr. app. - preanal appendage; ter. X - tergum X; IX - tergum IX. Materials. Holotype male: BRAZIL: Bahia: Camacan, RPPN Serra Bonita, riacho 1, trilha nova, 15°23'35"S , 39°33'50"W , ca 770 m, bandeja, 1.iv.2011, F. Quinteiro, D. Franca & H. Barreto leg. (MZSP). Paratypes: BRAZIL: Bahia: Camacan, RPPN Serra Bonita, riacho 1, trilha nova, 15°23'35"S , 39°33'50"W , ca 770 m, bandeja, 30.iii.2011, F. Quinteiro, D. Franca & H. Barreto leg., 1 male (DZRJ 3791); Camacan, RPPN Serra Bonita, 2ª cachoeira, over night, 03.xi.2009, A. R. Calor leg., 1 male (UFBA). Distribution. Brazil (Bahia). Etymology. The species is dedicated to the deceased Brazilian writer Jorge Amado, who was born in Bahia state in 1912 and died in 2001. Amado is one of the most acclaimed contemporary Brazilian novelists, whose 32 novels have sold millions of copies. Among his best-known works are "Capitaes de Areia", "Gabriela, Cravo e Canela", and "Tieta do Agreste". In 2012, Brazil celebrated the centenary of his birth.