New species and records of Anacroneuria (Plecoptera: Perlidae) from the northeastern semi-arid region of Brazil Duarte, Tácio Lecci, Lucas Silveira 8MPZR Klapalek 1909 [397,566,404,430] Insecta Perlidae Anacroneuria GBIF Animalia Plecoptera 8 299 Arthropoda genus  1 Dorsal keel absent..................................................................................... 2 1’ Dorsal keel present.................................................................................... 3 2 (1) Penial armature with pair of large distal vesicles ( Figs. 3B, C, D). In lateral view, gonopore sinuous dorsally with a small elevation in median region ( Fig. 3D). Forewing length 10–11 mm.....................................  A. calori  n. sp. 2’ Penial armature without distal ventral vesicles (see figs. 10–12 in Righi-Cavallaro & Lecci, 2010). In lateral view, gonopore concave dorsally without a small elevation. Forewing length 11.2 mm....................................  A. terere 3 (1’) Forewing length longer than 10 mm...................................................................... 4 3’ Forewing length 10 mmor less.......................................................................... 5 4 S ternum IX with row of thick bristles in lateral corners. Distal part of the terminal tube wide, rounded, darker region V-shaped ( Fig. 5B). Keel almost rounded in lateral view ( Fig. 5C). Forewing length 13.5–14 mm.................  A. singela  n. sp. 4’ Sternum IX without row of thick bristles in lateral edges. Distal part of the terminal tube narrow and pointed in dorsal/ventral views, keel pointed (sometimes almost round) in lateral view (similar to fig. 4 in Baldin et al., 2013). Forewing length 10–14.5 mm..........................................................................................  A. debilis 5 (3’) Penial armature subparallel in dorsal and ventral view....................................................... 6 5’ Penial armature narrowing gradually to apex (figs. 13–15, 20, 21 in Righi-Cavallaro et al., 2013)..................... 7 6 (5) Penial armature with gonopore slightly narrow in dorsal/ventral views (at shoulders) (see figs. 13–14 in Righi-Cavallaro et al., 2013). In dorsal view, keel form a pair of divergent, narrow ridges, truncate basally. In lateral view, keel forms a basal steep rise that proceeds to the broad rounded apex, shoulders rounded (see fig. 15 in Righi-Cavallaro et al., 2013). Forewing length 7.5–8.6 mm.................................................................................  A. bahiensis 6’ Penial armature with robust gonopore, truncate (see fig. 20 in Righi-Cavallaro et al., 2013). In dorsal view, keel forms a pair of diverging lines joined proximally. In lateral view, base of keel steep, dorsal contour then curves gradually to tip (see fig. 2 1 in Righi-Cavallaro et al., 2013). Forewing length, 8.0 mm long.............................................  A. kariri 7 (5’) Penial armature (see figs. 3–4 in Righi-Cavallaro et al., 2013) narrowing gradually to apex, distal end rounded; subapical region more sclerotized. In lateral view, the keel acute; in dorsal view, appearing as a broad “U”. Vesicles absent. Forewing length 8.0– 9.5 mm..........................................................................  A. amargosa 7’ Penial armature (see figs. 7–9 in Righi-Cavallaro et al., 2013) tapering gradually towards the apex, with a small subapical constriction in dorsal view. In lateral view, keel convex, in dorsal view appearing as two parallel lines. Vesicles absent. Forewing length 8.0– 8.9 mm..........................................................................  A. quilombola