Figs 41–44

Material examined. New South Wales: 1♂, 1♀, Gordon, Blackbutt Creek off Blackbutt Creek Walking Track (33.759°S 151.142°E), 25 Sep 2017, Z. Billingham & G. Theischinger, GHD (T1824 – T1825); 1♀, Lane Cove, Tributary of Gore Creek off Walking Track at Osborne Rd (33.823°S 151.179°E), 26 Sep 2017, Z. Billingham & G. Theischinger, GHD (T 18565); 1♀, Kembla Heights, American Creek off Cordeaux Rd (34.437°S 150.795°E), 19 Nov 2018, Z. Billingham & G. Theischinger, GHD (T 21739).

Remarks. Alexander (1926) described O. (O.) joana from a unique female, leaving the male of the species undescribed. With the availability of fresh material general notes on the male and a description of the hypopygium are now possible.

Photographs are included to show a lateral view of the thoracic colouration (Fig. 41), the wing (Fig. 42), and the ovipositor (Fig. 44). A figure of the hypopygium (Fig. 43) is also provided.

Male. Size and colouration much as described for female. Hypopygium largely yellowish brown. Distal margin of T9 broadly concave, sternite with triangular medial membranous area, narrowest at the distal margin. Gonostyli narrow and blade-like, the outer gonostylus faintly dilated towards base, weakly hooked at tip, inner gonostylus more simple, styli about ⅔ the length of the elongate gonocoxites. Aedeagus short and curving ventrad, posterior bridge of parameres narrow, dorsal arm of parameres with two short, bluntly tipped branches, the terminal branch a little larger.

Female. Size and colouration much the same as for male. Ovipositor with tergite yellowish brown, sternite dark brown. Cercus quite short, lightly curved. Tip of hypogynial valve reaching to about ¾ length of cercus.

Discussion. Only three species of Orimarga are known from Australia, seemingly occurring only in New South Wales from the Sydney-Blue Mountains area to the area around Wollongong. Orimarga (O.) joana is readily distinguished from O. (O.) australis Skuse, 1890, and O. (O.) inornata Skuse, 1890, by the patterned wings, particularly the coloured stigma, and by the unusual placement of crossvein r-m, at nearly ½ the length of R 4+5, the vein occupying a much more basal position in O. (O.) australis and O. (O.) inornata.