Acanthocasuarina campestris Taylor, sp. nov.

Figs 75–83, 97–99, 138; Tables 1–8

Types. AUSTRALIA, Western Australia: Holotype: 13 (slide) 15 km S Wialki, 30°37.182’S 118°08.751’E, G.S. Taylor & J.T. Jennings, 6.xii.2008, Allocasuarina campestris, ABCL 2008 656 (WAMA). Paratypes: 8 3, 10 Ƥ (slide), 2 nymphs (1 slide), 2 3, 4 Ƥ (dried), 77 3, 121 Ƥ, same data as holotype (ANIC, WAMA, WINC).

Other material examined. AUSTRALIA, Western Australia: from Allocasuarina campestris: 8 3 25 Ƥ 45 km E Geraldton (WINC); 11 3, 36 Ƥ Indarra Spring NR (WINC); 29 3, 31 Ƥ Kalbarri NP (WINC); 2 3, 1 Ƥ 20 km E Kondinin (WINC); 1 nymph (dried), 5 3, 12 Ƥ 10 km SSW Mukinbudin (WINC); 1 3, 5 Ƥ, 1 nymph 13 km N Northampton (WINC); 1 Ƥ 30 km WNW Northampton (WINC); 1 3, 1 Ƥ 13 km S Perenjori (WINC); 28 3, 41 Ƥ Wilroy NR (WINC); 9 3, 10 Ƥ 35 km N Wubin (WINC).

Description. Adult (Figs 75–81). Colour: Male: general colour ochraceous to orange-brown with brown to black markings. Vertex with a pair of diffuse broad brown markings; genal processes dark brown to black; antennal segments 1–2 dark brown to black; segment 3 brown, darker apically; segments 4–10 dark brown to black; pronotum pale with a pair of broad dark brown submedial markings; mesopraescutum with a pair of broad, suffuse, submedial dark brown markings; mesoscutum with two pairs of brown longitudinal submedial stripes, lateral-most thinner and paler; mesoscutellum orange; wings clear; wing vein R+M+Cu pale; legs with dorsal dark brown markings; fore and mid-tarsi dark brown to black, hind basitarsi ochraceous, distal segment of hind tarsi dark brown to black; abdominal tergites brown to dark brown; anterior face of proctiger brown; subgenital plate pale with brown infuscation medially and basally; parameres pale with black apices; proximal segment of aedeagus dark brown to black, distal segment ochraceous. Female: As for male, except generally slightly paler; markings on vertex brown, genal processes ochraceous to brown, pronotum, mesopraescutum and mesoscutum pale brown to brown; proctiger with brown infuscation medio-dorsally and apex dark brown; subgenital plate with brown infuscation and brown apex.

Structure: measurements and ratios as in Tables 1–5. Antennae short, 1.32–1.48 times width of head; genal processes elongate, conical, separated at base and becoming increasingly divergent; anterior margin of vertex rounded from dorsal aspect, delineated from genal processes by prominent ridge; vertex with prominent medial suture; pronotum with prominent anterior, medial node; thorax weakly arched, head distinctly wider than pronotum and mesoscutum; fore wings elongate with broadly rounded apex; Rs long, mostly straight except distally, terminating short of wing apex; vein M distinctly sinuate; vein M1+2 terminating well short of wing apex; cell m1 short, broadly triangular, m1 cell value 0.87–1.14; cell cu1 short triangular, cu1 cell value 1.39–2.19; radular areas thin, elongate in cells m1, m2 and cu1; male terminalia as in Figs 97–98; proctiger without lateral expansions; parameres thin elongate, strongly curved inward towards apex. Female terminalia as in Fig. 99; proctiger short with dorso-posterior margin smoothly rounded from lateral aspect and a barely upturned blunt apical process; subgenital plate broad, triangular from lateral aspect.

Nymph (Figs 82–83): Measurements and ratios as in Tables 6–7. Body light-brown with dark brown markings. Eyes reddish brown; head with submedial brown spots; meso-and metathoracic depressions dark brown to black with irregular dark brown markings anteriorly and posteriorly; caudal plate with dark brown infuscation submedially and delineating margins of abdominal tergites. Body elongate; anterior margin of head weakly pointed medially; dorsum of body with a distinct medial longitudinal ridge; caudal plate with hind margin narrowly rounded.

Etymology. Named after the host plant, Allocasuarina campestris .

Distribution. Recorded from inland Western Australia from Kalbarri and Geraldton and throughout the inland “wheat-belt” region east to Wialki and Mukinbudin, and south to Kondinin in south-western Western Australia (Fig. 138).

Host plant. Recorded from Allocasuarina campestris (Diels) L.Johnson. Allocasuarina campestris occurs as a dense, erect, 1–3 m shrub on sand-plain and lateritic soils, widespread in the wheat-belt of Western Australia from N of the Murchison River to S of Ravensthorpe and E of Esperance (Wilson & Johnson 1989).

Comments. See Comments under Ac. acutivalvis for diagnoses.