Daternomina scindens (Neboiss) comb. nov. Figures 37–39, 60 Ecnomina scindens Neboiss, 1982: 295, figs 44, 45, 50–53. — Neboiss 1986: 155. Diagnosis. Daternomina scindens resembles D. merga in having relatively long superior and inferior appendages, but differs in having more robust appendages. Description. (Revised after Neboiss 1982). Head, body and wings brown; wings (Neboiss 1982, fig. 50; Neboiss 1986: 155) similar to D. irrorata (Fig. 1). Forewing length about 3.3 times width: male 4.6–5.0 mm, female 4.5 mm. Forewing fork 2 relatively long, sessile, about 1.6–1.8 times length of fork 3, nygma present; fork 3 about 1.9–2.0 times length footstalk, footstalk length about 2.0–2.5 times length cross-vein m; r-m and m displaced at fork 3 by about 1.2–1.7 times length cross-vein m; fork 4 shorter than fork 3; fork 5 long, about 1.5 times length of fork 4. Hindwing length about 3 times width; fork 2 sessile, length about 1.5–1.8 times length of fork 3. Male. Tergum X membranous with a pair of lobes (Fig. 39). Superior appendages long, laterally compressed; in lateral view robust, sub-rectangular, length about 2.5 times width (Fig. 37); in dorsal view, relatively slender, length about 5 times width, with two rows of spines on inner surface (Fig. 39). Phallus simple, tube-like, with a pair of robust, hook-like processes dorso-laterally; with a single, slender, elongate, curved sword-like process (phallic guide) arising from near the base of the inferior appendages (Fig. 37). Inferior appendages long, dorso-ventrally flattened; in ventral view fused basally to form a single plate, distal twothirds separated narrowly by a deep mesal split, with pair of digitiform apices (Fig. 38); in lateral view robust, length about 2.5 times width, narrowed at distal third (Fig. 37). Female. Genitalia with a pair of large relatively narrowly separated ‘tongue-shaped’ lobes on sternite VIII (Fig. 60). Material examined: Western Australia. Holotype male, Harvey River near Harvey Falls, 15 km E of Harvey, 21 Nov 1978, A.N. (NMV, T- 6332). Paratypes, 5 males (specimen PT-626 figured), 25 females (specimen PT-724 figured), collected with holotype (NMV). Other material. 1 male, 4 females, Harvey R., below Harvey Falls, 15 Nov 1980, A. Wells and M. Brock; 1 female, 24 km NW of Walpole, 15 Nov 1958, E.F. Riek (ANIC); 1 male, Frankland R., circular pool, 6 km NE of Walpole, 27, Nov 1978, A.N.; 3 males, 1 female, Beedelup Falls, 16 km W of Pemberton, 13 Nov 1958, E.F. Riek (ANIC); 1 male, Augustus R., Collie, 30 Oct 1983, S. Bunn. Remarks. Daternomina scindens is recorded from five sites in south-western Australia (latitudinal range 32°46' - 34°57'S). Neboiss’s (1982) figures have been redrawn to allow direct comparisons and to accompany the description that is revised in light of new interpretations of Daternomina genitalic structures.

Published as part of Cartwright, David I., 2008, A review of the Australian species of Ecnomina Kimmins and Daternomina Neboiss (Trichoptera: Ecnomidae), pp. 1-76 in Zootaxa 1774 (1) on pages 22-23, DOI: 10.11646/zootaxa.1774.1.1, http://zenodo.org/record/5124133