Scymbalium rossii nov.sp. (Figs 1-9)

T y p e m a t e r i a l: Holotype ♂: " CAMBODIA - Kampong Chhnang prov., Kampong Chhnang env., Toul Ompel, 12°14'14''N, 104°41'15''E, light trap, 19+ 21.V.2018, leg. Bernardi, Kong & Rossi / Holotypus ♂ Scymbalium rossii sp. n., det. V. Assing 2018" (cAss). Paratype ♀: same data as holotype (cAss).

E t y m o l o g y: This species is dedicated to Walter Rossi (L'Aquila), to whom I am grateful for the generous gift of all the Cambodian specimens treated in this paper.

D e s c r i p t i o n: Body length 7.0- 7.7 mm; length of forebody 3.7-4.1 mm. Habitus as in Fig. 1. Body somewhat depressed. Coloration: head and pronotum reddish-brown; elytra reddish; abdomen dark-brown to blackish-brown with the apex (segments VIII-X and the posterior portion of VII) reddish; legs yellowish-red; antennae red.

Head (Fig. 2) 1.10-1.15 times as broad as long; integument with double punctation, with coarse and dense macropunctures and with interspersed micropunctures; median dorsal portion with somewhat sparser punctation; interstices without microsculpture. Eyes approximately as long as postocular region in dorsal view. Antenna long and very slen- der, approximately 3.0 mm long; antennomeres IV-XI at least approximately twice as long as broad and club-shaped, i.e., basally very thin and apically distincty dilated, broadest anterior to apex. Maxillary palpus with short and conical apical palpomere, this palpomere approximately one-third as long as palpomere III.

Pronotum (Fig. 2) 1.12-1.15 times as broad as long, broadest near anterior angles, distinctly tapering posteriad; lateral margins straight or weakly sinuate in the middle; posterior margin weakly concave in the middle; macropunctation dense, slightly less coarse than that of head; micropunctation scattered, sparser than that of head; midline moderately broadly impunctate.

Elytra (Fig. 2) approximately as long as pronotum; punctation rather fine and dense. Hind wings fully developed. Protarsomeres I–IV distinctly dilated in both sexes. Metatarsomere I approximately as long as the combined length of II and III.

Abdomen (Fig. 3) approximately as broad as elytra; punctation distinct and very dense, similar to that of elytra; interstices glossy, with extremely fine and nearly obsolete transverse microsculpture visible only at high magnification (100 x); posterior margin of tergite VII with palisade fringe; tergite X and sternite IX unmodified, not of reduced size; postero-lateral processes of segment IX approximately 1.5 times as long as tergite X, apically with a spine curved upwards.

♂: posterior excision of sternite VIII narrow and short, about one-eighth a long as length of sternite (Fig. 4); aedeagus (Figs 5-8) slender, with short hooked apex (lateral view), and with heavily sclerotized internal structures.

C o m p a r a t i v e n o t e s: This species is evidently closely allied to S. anale and S. persimile . It is distinguished from both of them by smaller size, paler coloration of the forebody, and coarser punctation of the abdomen. It additionally differs from S. anale by a posteriorly less strongly tapering pronotum, relatively larger eyes, a much shorter and narrower posterior excision of the male sternite VIII, and by a much smaller aedeagus ( S. anale: aedeagus approximately 2.0 mm long) with an apex of different shape in lateral view. The male sexual characters of S. persimile are unknown.

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: The type locality is situated near Kampong Chhnang in the estuary of the effluent of Tonle Sap lake (Fig. 9), Cambodia. The specimens were collected with a light trap, together with seven species of Micrillus (one of them undescribed).