Aacanthocnema casuarinae

Description. Adult (Figs 6 – 12). Colour [from dried specimens]: Male: general colour ochraceous to dark brown. Vertex dark brown; genal processes white to pale cream; antennal segments 1 – 2 brown to dark brown; segment 3 brown, darker apically; segments 4 – 10 progressively dark brown to black; pronotum with a pair of dark brown to black longitudinal submedial stripes; mesopraescutum darker laterally; mesoscutum and mesoscutellum dark brown; wings clear except for brown infuscation along veins R + M + Cu, M, M 1 + 2, M 3 + 4, Cu, Cu 1 a, Cu 1 b and distal portion of Rs; legs with dorsal dark brown infuscation; distal tarsal segments dark brown to black; abdominal tergites dark brown to black; proctiger, subgenital plate and parameres brown to dark brown. Female: as for male, except paler: vertex with a pair of brown markings in vicinity of fovea; pronotum with a pair of brown to dark brown longitudinal submedial stripes; mesopraescutum with a pair of brown submedial markings; mesoscutellum with a pair of orange-brown to brown longitudinal stripes; proctiger brown with dark brown infuscation in proximity to circum-anal pore ring and dark brown to black at apex; subgenital plate with dark brown apex. Structure: measurements and ratios as in Tables 1 – 5. Antennae short, 1.33 – 1.47 times width of head; genal processes moderately long, 0.65 – 0.84 times length of vertex, conical, apices separated, little-divergent; anterior margin of vertex rounded from dorsal aspect, delineated from genal processes by prominent ridge; vertex with distinct medial suture; pronotum with prominent anterior, medial node; thorax weakly arched, head wider than pronotum and mesoscutum, fore wings elongate with broadly rounded apex; Rs short, terminating well short of wing apex; vein M 1 + 2 terminating little short of wing apex; cell m 1 short, broadly triangular, m 1 cell value 0.93 – 1.42; cell cu 1 short triangular, cu 1 cell value 1.15 – 1.52; vein Cu 1 a strongly arched (veins Cu 1 a and M proximal at closest point); radular areas elongate in cells m 1 and m 2 and cu 1; male terminalia as in Figs 16 – 17; proctiger without lateral expansions; parameres short, broad basally from lateral aspect, weakly curved inward towards apices. Female terminalia as in Fig 18; proctiger broadly rounded, dorsal margin rather flat from lateral aspect; subgenital plate short, broadly rounded, triangular from lateral aspect. Nymph (Fig 13): Measurements and ratios as in Tables 6 – 7. Body brown with dark brown markings. Eyes reddish brown; head with submedial dark brown markings in vicinity of fovea; thorax with meso-and metathoracic depressions dark brown to black; lateral margins of fore wing pads dark brown; caudal plate with dark brown infuscation submedially and delineating margins of abdominal tergites. Body elongate; anterior margin of head rounded; dorsum of body with a distinct medial longitudinal ridge; caudal plate narrow with hind margin rounded.