Hydrobiosella tarrong sp. nov.

Figures 8–10, 40

Holotype. Male. Victoria, Cement Ck nr Warburton (about 37°43'S, 145°43'E), 26 Mar 1958, A. Neboiss (NMV, T-21425).

Paratypes. Victoria. 2 males (specimen CT-609 figured), 3 females (specimen CT-610 figured), collected with holotype; 1 male, same loc. and coll., 27 Mar 1972 (NMV) .

Diagnosis. Males of Hydrobiosella tarrong can be separated from those of other species in the group by the slender apical half of segment X, in lateral view and the inferior appendages with harpago dilated slightly in apical half.

Description. Wings similar to those of H. bandabanda (Fig. 1); length of forewing: male 7.8–9.0 mm, female 8.5–9.0 mm.

Male. Segment IX with a shallow, wide notch medially on distal margin (Fig. 10). Segment X in dorsal view, a ‘tongue-shaped’ process, with sides almost parallel in basal half, with a pair of very small knobs baso-laterally, tapered distally to a slightly rounded apex, without a central dorsal ridge or groove (Fig. 8); length about 1.7 times width; in lateral view broad-based, narrowed strongly at midpoint, slender with almost parallel sides in distal half (Fig. 9). Phallus generally tube-like, robust, slightly truncate, with a pair of sub-apical spines and two groups of chitinous spines basally (Figs 8, 9). Inferior appendages in lateral view, robust, with basal segment sub-rectangular, slightly angular meso-dorsally, length about 1.8- 1.9 times maximum width; harpago shorter, length about 0.8 times length basal segment, length about 1.9 times maximum width, with slightly dilated, broadly rounded apex (Fig. 9).

Female. Genitalia typical of genus, with a small projection on sternite IX meso-distally (Fig. 40).

Etymology. Tarrong – Australian aboriginal word for teeth (pair of ‘chitinous spines‘ in middle of phallus).

Remarks. Four male and three female specimens of Hydrobiosella tarrong have been collected from the type locality in eastern-central Victoria (latitude 37°43'S).