Rhinocylapus acutangulus Poppius

(Fig. 2 J, 3A)

Rhinocylapus acutangulus Poppius 1909: 5,6,43

Rhinocylapus acutangulus: Bergroth 1920: 73; Carvalho 1957: 23, 1980a: 644; Schuh 1995: 36; Gorczyca 2006: 72

Diagnosis. Rh. acutangulus is closely related to Rh. redeii, but can be easily distinguished by a larger, more shining body; humeral angles of pronotum distinctly elevated; pronotum and hemelytron without setae.

Redescription. Female. COLORATION (Fig. 2 J). Dorsal surface dark castaneous. Head. Antenna dark; antennal segment I entirely brown; segment II dark brown, with very broad, yellow, slightly tinged with red ring medially; segments III and IV missing in the specimen examined; rostrum brownish yellow. Thorax. Mesoscutum and scutellum. Dark brown blackish; scutellum paler, dark brown medially, yellow apically. Thoracic pleura. Dark brown. Hemelytron. Apex of clavus and corium near apex of clavus with very small, yellowish spot; cuneus with inner angle yellowish orange. Legs (broken in the specimen examined, only meso- and metacoxae, and femur and tibia of metaleg remained). Brown yellow; meso- and metacoxa dull yellowish; tarsus yellowish brown. STRUCTURE AND VESTITURE (Fig. 2 J, 3A). Dorsal surface shining. Head. Heavily polished, shining, devoid of setae; longitudinal sulcus on vertex shallow, indistinct; frons with slightly marked, transverse incision medially (clearly visible in lateral view), mandibular plates matte posteriorly; buccula matte; gula with indistinct punctation behind eye and between antenniferous tubercle and margin of eye; segment II covered with thick, semidecumbent, sparse setae; rostrum long, reaching beyond metacoxae. Thorax. Pronotum. Shining; pronotal collar slightly matte, without setae; anterior lobe impunctate, smooth and polished, without setae; pronotal calli strongly elevated, particularly quite medially, with distinct, thin, shallow, longitudinal sulcus posteriorly, running downward onto shallow incision medially of pronotum; posterior lobe sparsely covered with dark setae, irregularly punctate, medially with thin, shallow, longitudinal sulcus near lateral margin; humeral angles strongly elevated. Mesoscutum and scutellum. Shining; scutellum slightly rugose laterally. Hemelytron. Sparsely covered with relatively long, dark, semidecumbent setae.

Male. Unknown.

Measurements. Ψ: body length 8.1, width 2.6. Head. Length 1.55, width 1.2, diameter of eye in dorsal view 0.33. Antenna. Length of segment I 1.55, II 2.4. Labium. Length of segment I 2.18: remaining segments immeasurable in the examined specimen. Pronotum. Length 1.75, width of anterior margin 0.75, length of lateral margin 1.76; width of posterior margin 2.33.

Biology. Unknown.

Distribution. Malaysia (Borneo).

Type material. Holotype Ψ: Sarawak, G. Doria, 1866; 35; Nabidae gen.?, Ψ; Museo Civ. Genova; Rhinocylapus n. sp.; HOLOTYPUS Ψ, Rhinocylapus acutangulus B. Poppius, 1909 (MCSN).