Head elongate, anteocular part distinctly longer than postocular part without neck, nearly horizontal, weakly declivous, antennifers not closer to eyes than longitudinal diameter of eye. Head, especially neck, with sparse long and dense short pilosity, neck transversely wrinkled. Humeral angles of pronotum prominent, posterior lobe medially elevated. Apex of labium surpassing mid coxa. Scutellum triangular, with faint Y-shaped elevation. Clavus with four full rows of punctures.

The new subgenus can readily be separated from the nominotypical subgenus based on the above mentioned characters: all known members of Vertomannus (Vertomannus) have a globose head with only sparse long pilosity (without short hairs) and with a relatively short anteocular part, a smooth neck; humeral angles of pronotum not prominent, labium not surpassing fore coxa, scutellum without a distinct elevation and clavus with only three rows of punctures.

Type species (by present designation): Vertomannus (Elongatomannus) flavus sp. n.

Formed by the combination of the Latin prefix elongato- ‘elongate’ and –mannus, the former referring to the strikingly elongate head and neck characteristic for the subgenus, the latter referring to the genus Vertomannus. Gender masculine.

Holotype: female, pinned. Original label: “S Vietnam, 14°10'N, 108°30'E 40km NW of An Khe, Buon Luoi, 650–750m 28.3.–12.4. 1995, Pacholátko & Dembicky leg.” [printed] (NHMW).

Paratype: 1 female, pinned. Original labels: “Laos, 24–29. IV. 2001, 18°07'N, 104°29'E, Khammouan pr. Ban Khoun Ngeun ca 200m, V. Kubáň lgt.”, “Collectio Petr Baňař, Moravian Museum Brno” (MMBC).

Measurements (in mm). Body length: 9.75; head length with neck: 2.75, width: 1.0, interocular space: 0.55, anteocular length: 0.7, postocular length: 0.55, neck length 1.15; pronotum: length: 1.5, humeral width: 1.55; scutellum: length: 1.0, width: 0.9; length of claval commissure: 2.0; lengths of antennal segments: I 0.95, II 2.9, III 2.35, IV 2.45; lengths of labial segments: 5.05 = I 1.5, II 1.6, III 1.4, IV 0.55.

Body elongate, dorsum moderately shiny, thoracic sternum dull (Fig. 1). Head, neck and ventral side of body with short semidecumbent hairs, long erect hairs present only on head (Fig. 2).

Head: head-neck transition very gradual. Antennal segment I thickened apically, remaining segments long and filiform.

Thorax: pronotum trapeziform, lateral margin concave, anterior lobe narrower than posterior, anterior lobe without punctures except at margins, posterior lobe distinctly punctured, punctures with very short inconspicuous setae, posterior lobe a little more declivous than anterior lobe in lateral view. Scutellum triangular, width and length subequal, with dense punctures except faint Y-shaped elevation, with very fine, hardly visible hairs.

Legs slender and long, fore femur distally with two large spines and one small spine, with hairs as long as diameter of femur. Corium less punctured, not pubescent. Abdomen: densely pubescent with silvery hairs.

Colouration. Body stramineous, punctures brown. Head and antennal segment I reddish brown, antennal segments II-III stramineous with reddish apex, segment IV brown with basal third reddish. Lateral margin of anterior lobe of pronotum darker than disk, punctures on posterior part brown. Scutellum slightly darker than ground colour of body. Membrane honey-coloured, apical part translucent, subapically with a transverse stripe connected with a longitudinal stripe.

The long and stramineous body and the features in the diagnosis of the subgenus easily separate this species from all known Vertomannus species.

The species is named after the unique colouration. The epithet “flavus” is a Latin adjective in nominative case, meaning “yellow”.

Holotype: female, pinned. Original label: “C. Borneo, Long Nawang, leg. Mjöberg 1925” [printed] (ZMAN).

Measurements (in mm). Body length: 5.85; head length with neck: 1.63, width: 0.95, interocular space: 0.6; anteocular length: 0.3, postocular length: 0.5, neck length 0.53; pronotum: length: 0.95, width: 1.55; scutellum: length: 0.95, width: 0.6; length of claval commissure: 1.4; Length of antennal segments: I 0.75, II 1.8, III 1.5, IV missing; lengths of labial segments: 1.65 = I 0.5, II 0.35, III 0.5, IV 0.3

Head globose, shiny, frons smooth, not wrinkled, not punctured (Fig. 3). Anteocular part shorter than postocular part without neck. Long hairs present on head and neck. Labium surpassing anterior margin of prosternum but ending before fore coxae, segment I reaching hind margin of eyes (Fig. 4).

Thorax: Pronotum trapezoidal, with long hairs, lateral margin concave, anterior lobe impunctate, narrower than posterior lobe which is punctured, posterior lobe a little more declivous than anterior lobe in lateral view. Scutellum longer than wide, sparsely punctured, with some long hairs.

Legs slender and long, fore femur with a single spine, provided with hairs which are longer than diameter of femur. Corium with two rows of punctures along claval suture and with irregular punctures on apical half of mesocorium, not pubescent. Membrane with four distinct veins, not forming cells.

Abdomen: densely pubescent with decumbent silvery hairs.

Colouration. Body fuscous. Posterior lobe of pronotum pale- brown except middle part, antenna pale. Bases of femora pale stramineous, apical halves brown, tibiae basally pale yellowish brown, gradually lightening towards apex, tarsi faint light brown. Scutellum with tiny stramineous spot at apex. Corium with extensive pale colouration, basal half pale except punctures, behind this area a wide stripe mostly ochraceous with brown spots and a tiny rounded white spot at apex of claval commissure; apex of corium brown with extensive white subapical spot. Membrane pale brownish, with some white spots.

Vertomannus borneensis sp. n. is smaller than the other described species of the genus. The rounded, shining anteocular part of head (without wrinkles) is diagnostic value. The long pilosity on head is more sparse than for other species. Vertomannus crassus Zheng, 1981 and Vertomannus validus Zheng, 1981 are clearly different in multispinose and thick fore femora and large globose anterior pronotal lobe. Vertomannus brevicollum Zheng, 1981 has a very short neck, shorter than postocular part, and the apical part of abdomen is yellowish brown. Vertomannus capitatus, Vertomannus emeia Zheng, 1981 and Vertomannus ophiocephalus Zheng, 1981 have a longer labium reaching the fore coxae and have at least two spines on fore femora. Additionally, Vertomannus ophiocephalus has a longer neck than the postocular part of head; and moderately shortened hemelytra, not reaching the end of the abdomen. The pale subapical spot of corium has concave fore margin at Vertomannus capitatus, however, Vertomannus borneensis has this spot with straight fore margin.

The name of the species refers on the type locality, “borneensis” is a Latin adjective in nominative case with meaning “origin from island Borneo” (now Kalimantan).