Twenty-four new species of Polycentropus (Trichoptera, Polycentropodidae) from Brazil Author Hamilton, Steven W. Author Holzenthal, Ralph W. text ZooKeys 2011 76 1 53 http://dx.doi.org/10.3897/zookeys.76.790 journal article http://dx.doi.org/10.3897/zookeys.76.790 1313-2970-76-1 Polycentropus soniae Hamilton & Holzenthal sp. n. Fig. 9 Description. Polycentropus soniae sp. n. most closely resembles Polycentropus fluminensis and Polycentropus tripui , particularly in the ventral aspect of the compact inferior appendage. It can be separated from these species by the angular dorsolateral flange of the inferior appendage and the narrower and rounded mesolateral process of the preanal appendage. Adult. Length of forewing (male) 6-7 mm. Body dark brown to black; dorsum of head and thorax black, clothed with long, erect dark setae; base of forewing with long, erect black setae, general vestiture of forewing with fine black setae, lacking patches of pale setae; legs dark brown to black. Male . Genitalia as in Fig. 9. Sternum IX in lateral view broadly subtriangular, about 3/4 height of segment VIII; in ventral view trapezoidal, anterior corners broadly rounded, sides very slightly constricted mesally, anteriorly, posterior margin slightly concave with very broad, shallow convex medial region. Terga IX + X membranous. Intermediate appendage slightly curved on basal 1/3 and relatively straight for remainder of length, long, length slightly greater than height of abdomen, basal region slightly expanded; in dorsal view nearly uniform in diameter throughout length, gradually narrowing apically. Mesolateral process of preanal appendage very short, apex rounded, at base broadly joined to ventral 2/3 of mesoventral process; mesoventral process directed caudad, broadly digitate, slightly shorter than length of mesolateral process. Inferior appendage in lateral view short, quadrate; dorsolateral flange low, straight dorsally, with prominent caudomesal spine, exposed in lateral view; mesoventral spine present, broad, in lateral view rounded, positioned more basad; in ventral view inferior appendage approximately oval, caudomesal spine prominent, acute; mesoventral spine hidden. Phallobase short; in lateral view apicoventral projection narrow, much shorter than diameter of apical diameter of phallobase apex, with 1 point; endothecal sclerotic band narrow, becoming rapidly less sclerotized toward apex; endothecal spines absent; phallotremal sclerite wide in dorsal aspect. Subphallic sclerite Y-shaped, arms long, pedicel with broad lateral expansions; broad in lateral view, ventrally narrowed. Figure 9. Polycentropus soniae sp. n. Male genitalia: A lateral B dorsal C ventral D inferior appendages, caudal E phallus, lateral F phallus, dorsal G subphallic sclerite, caudal. Holotype male: BRAZIL: Parana : Rio Mae Catira, 10 km N Porto de Cima, 25°21.821'S, 48°52.473'W, 200 m, 8-9.xii.1997, Holzenthal & Huisman (UMSP000033175) (MZUSP). Paratypes: BRAZIL: Parana : same data as holotype, 10 males, 3 females (UFBA), 10 males, 3 females (UFRJ), 10 males, 3 females (MZUSP), 10 males, 2 females (NMNH), 20 males, 6 females (UMSP); trib. to Rio Mae Catira, 10.5 km N Porto de Cima, 25°21.778'S, 48°52.590'W, 200 m, 10.xii.1997, Holzenthal & Huisman, 28 males, 2 females (UMSP). Etymology. Named for Dr. Sonia N. Lazzari, professor of entomology at the Universidade Federal do Parana , Curitiba, Brazil, in appreciation of her help and friendship during the junior author's studies in Brazil.