The genus Ochrotrichia Mosely (Trichoptera: Hydroptilidae) in Costa Rica, with the description of four new species Author Bueno-Soria, Joaquin Author Holzenthal, Ralph W. text Zootaxa 2008 1763 41 54 journal article 10.5281/zenodo.181971 0fa7c8c1-980b-4b65-9805-a9782e447369 1175-5326 181971 Ochrotrichia avicula , new species Fig. 1 a,b,c This species is a member of the xena group of Flint (1972) as indicated by segment X occurring as a single broad, elongated plate. It is related to Ochrotrichia avis Bueno-Soria & Holzenthal and O. quebrada Bueno- Soria & Holzenthal by the similarly elongated appearance of segment X in lateral view. From these species, O. avicula new species differs by the presence of a wide, straight, elongated spine on the left side of segment X. Male: Length of forewing 2.5 mm . Color in alcohol dark brown. Segment IX depressed, slightly produced anteriad. Segment X in dorsal view hood-like, with wide, long, straight, spine-like process on left side; apex with short sclerotized hook-like on right side; in lateral view, hood-like with strong hooked apex curved ventrad. Inferior appendage in lateral view elongate, apex rounded; apical portion and midventral areas with group of black peg-like setae; in ventral view symmetrical, with group of large, black, peg-like setae apically and midventrally. Phallus long, tubular, with slightly wider basal section. Female: Unknown Type material: Holotype , male. COSTA RICA : Puntarenas: Río Jaba at rock quarry, 1.4 km (air) W Las Cruces, 8.79° N , 82.97° W , el. 1150 m , 9.viii.1990 , Holzenthal, Blahnik and Muñoz ( UMSP ). Paratypes : same data as the holotype 6 males ( UMSP , NMNH , INBIO , CNIN ). Etymology: Avicula is the Latin feminine diminutive of bird, referring to the beak-like apex of segment X in lateral view.