Bruneastrum gen. nov.

Type species. Bruneastrum cardinale sp. nov., here designated.

Diagnosis. Metope smooth, with no intermediate carinae visible (Figs 3, 13). Metope and coryphe joining at obtuse angle in lateral view (Fig. 12). Coryphe transverse (Figs 4, 14). Fore wings without hypocostal plate, with basal angle of costal margin distinctly convex (semicircular) (Figs 1, 12). Hind wings unilobed (Fig. 2), reaching abdominal apex. Hind tibia with 2 lateral spines. First metatarsomere with 5 intermediate spines in full row. Phallobase with a pair of long, curved latero-apical processes, narrowing apically (Fig. 6, laphp) and with a pair of ventro-lateral lobes (Fig. 6, vlphl). Aedeagus lacking ventral hooks.

Description. Metope smooth, with rudimentary median carina only in its apical part and without sublateral carinae, elongate, enlarged above the clypeus (Figs 3, 13). Lateral keels (margins) of metope visor shading the antennae in dorsal view (Figs 11, 14). Metopoclypeal suture distinct, straight. Postclypeus large, smooth, with thick median carina running through the anteclypeus as well. Metope and coryphe joining at obtuse angle (in lateral view); metope visible from above (Figs 11, 12). Coryphe transverse, twice as wide as long medially, with anterior margin convex and posterior margin weakly concave (Figs 4, 14). Ocelli absent. Pedicel 1.5 times as long as wide, cylindrical. Pronotum very short, nearly 5 times shorter than mesonotum, without carinae; anterior and posterior margins keel-shaped. Paradiscal fields of pronotum very narrow, not visible behind the eyes. Paranotal lobes large, without carinae. Tegulae large. Mesonotum smooth, without carinae. Fore wings smooth, wide, narrowing apically, with distinctly convex (semicircular) basal angle of costal margin (Figs 1, 12); fore wings without hypocostal plate, with setae on costal margin. Claval suture of fore wing distinct only basally, disappearing after ¼ of wing length (Fig. 1). Hind wings unilobed, well-developed, reaching abdominal apex, with long and dense setae on costal margin (Fig. 2). Hind tibiae with 2 lateral spines distally. First metatarsomere with 2 lateral and 5 intermediate spines in full row apically. Second metatarsomere with only 2 latero-apical spines. Male genitalia (Figs 5–10). Pygofer wide, with convex hind margin (in lateral view) (Fig. 6). Anal tube wide (in dorsal view), with deep apical concavity (Fig. 9). Anal column long, 0.3 times as long as whole anal tube (Fig. 10). Phallobase curved at obtuse angle (in lateral view), wide (in ventral view) (Fig. 5), with a pair of long latero-apical processes curved at right angle and narrowing apically (Fig. 6, laphp) and with a pair of ventro-lateral lobes (Fig. 6, vlphl). Ventral phallobase lobe wide, reaching phallobase apex. Aedeagus lacking ventral hooks. Style massive, with hind margin concave (Fig. 7, hms). Capitulum of style on short neck (Fig. 7, n), wide (in dorsal view) (Fig. 8), with distinct lateral tooth, apical tooth very weak. Differential diagnosis. Bruneastrum gen. nov. is similar to the genus Mongoliana Distant, 1909 with which it shares a distinctly convex (semicircular) basal angle of the fore wing costal margin (Figs 1, 11–12), but differs from the latter by the absence of aedeagal ventral hooks in males.All species of Mongoliana (known from mainland China) have well-developed ventral hooks of aedeagus (FENNAH 1956, fig. 18B; CHE et al. 2003). Bruneastrum gen. nov. differs from the genera Hemisphaerius Schaum, 1850 and Gergithus Stål, 1870 (both known from Borneo, see below) by more elongate fore wings (Fig. 12).

Etymology. Derived from the combination of the Greek noun άστρο (star) and Brunei which means a “star of Brunei ” (gender neutrum).