Hydrobiosella bos sp. nov.

Figures 33–35, 43

Holotype. Male. Victoria, Eurobin Falls, Mt Buffalo Rd (about 36°42'S, 146°50'E), 3 Dec. 1982, A. Neboiss (NMV, T- 21484).

Paratype. Victoria. 1 male (specimen CT-553 figured), 2 females (specimen CT-554 figured), collected with holotype (NMV) .

Diagnosis. Males of Hydrobiosella bos can be distinguished from those of other species in the group by the dorso-mesally angled basal segment on the inferior appendages.

Description. Wings similar to H. letti (Fig. 17), length of forewing: male 7.6-8.0 mm, female 8.9-9.4 mm.

Male. Segment IX robust, in lateral view, length about 1.4 times width, projecting and tapered basally (fig. 34), with a shallow, wide concavity medially on distal margin (Fig. 35). Segment X broad-based, tapered distally (Figs 33, 34), in dorsal view, ‘tongue-shaped’, length about 1.8-1.9 times width, broadly rounded apex (Fig. 33); in lateral view, straight, with slightly bulbous apex (Fig. 34). Phallus generally tube-like; with a pair of long, slightly curved, ‘parameres’ arising from the phallus near base (Figs 33, 34). Inferior appendages in lateral view, with basal segment sub-pentangular, length about 1.4 times maximum width, harpago shorter, length about 0.7 times length basal segment, more slender, length about 2.6 times maximum width, sub-ovate, broadly rounded apically (Fig. 34).

Female. Genitalia typical of genus with a small acute projection on sternite IX meso-distally (Fig. 43).

Etymology. Bos – Latin for buffalo (type locality-Mt Buffalo).

Remarks. Two males and two female specimens of Hydrobiosella bos have been collected from the type locality in north-eastern Victoria (latitude 36°42'S).