Xanthopenthes constanti, Platia & Pulvirenti, 2023

Xanthopenthes constanti n. sp.

( Fig. 19, 41, 78)

ZooBank:http://zoobank.org/ 1D8F240A-2007-422A-9ECB-B95B1F933CE5

Holotype, ♂, Thailand, Loei, Na-Haeo (field res. stat.), 15-19.V.2003, J. Constant, K. Smets & P. Grootaert, light trap ( IRSNB).

Paratype, ♂, same data as holotype ( CPG) .

Diagnosi s. – A species X. birmanicus -group sensu Schimmel, 1999, that for the impressed last visible sternite can be compared to X. viklundi n. sp., it is separated by the uniformly blackish colour, shorter antennae and aedeagus.

Description. – Male.

Moderately shiny.

Coloration. – Entirely blackish with antennae and legs ferruginous; covered with dense, yellow fulvous pubescence.

Head. – Frons flat, slightly impressed only immediately before the anterior margin, the latter regularly curved, sub-horizontally a little projectingabove the clypeus, puncturesumbilicate, withshortest intervalsor contiguous. – Antennae exceeding by three articles the apices of posterior angles of pronotum, serrated from the fourth article on; second article globous, long as wide, third subconical, fourth-tenth sub-triangular, gradually slenderer, longitudinally carinate; second and third taken together long as the fourth;last lacking. (Fig.41).

Pronotum. – 1.10-1.13x longer than wide, widest at the apices of the posterior angles, very convex, abruptly sloping at sides and base; sides very gradually and regularly tapering from thebase to the anterior margin;posterior angles long, acuminate, not divergent, bicarinate; carinae short, equal in length, diverginganteriorly; lateral margincomplete andnotvisible ina dorsal view; punctuation dense, uniformly distributed; punctures on the disk small, slightly umbilicate with shortest, shiny intervals, larger and clearlyumbilicate towards the sides with shortest, shagreened intervals to contiguous.

Scutellum . – Strongly declivous, tongue-shaped not ridged at base, flat to sub-convex, strongly punctured.

Elytra. – 2.3.2.35x longer than pronotum and 2.6-2.65x longer than wide, narrower than pronotum at base, convex, rather flattened on the disk; sides sub-parallel from the base to the middle then very gradually tapering to the apices, the latter regularly rounded; striae regularly marked, interstriae flat with a microgranulate surface.

Last visible sternite. – Slightly impressed at sides before the apex, this thickened.

Aedeagus. – As in the Fig. 19 length 1.37 mm).

Size. – Length 9.5-9.8 mm, width 2.31- 2.37 mm.

Female. – Unknown.

Etymology. – Dedicated to J. Constant of the IRSNB that sent us material for study.

Xanthopenthes nigerrimus n. sp.

( Fig. 20, 42, 79)

ZooBank:http://zoobank.org/ 494D272C-D5FF-45D8-99BD-0EA64AFF892B

Holotype, ♂, Thailand, Loei, Na-Haeo (field res. stat.), 15-19.V.2003, J. Constant, K. Smets & P. Grootaert, light trap; Loei, Na Haeo, forest clearing, light trap, 16.V.2003, Constant & Smets ( IRSNB).

Paratypes, 9 ex. (7 ♂, 2 ♀), same data as Holotype. ( CPG, IRSNB) .

Diagnosi s. – A blackish species of the X. lugubris -group sensu Schimmel, 1999, that can be compared to X. unicarinatus (Fleutiaux, 1918) but is immediately separated for the bicarinate angles of pronotum and toothed paramera in aedeagus.

Description. – Male.

Very moderately shiny.

Coloration. – Entirely blackish with antennae brown and legs ferruginous; covered with dense, recumbent, yellow-fulvous pubescence.

Head. – Frons very slightly impressed in the middle, anterior margin, curved, moderately thickened, sub-horizontally a little projected above the clypeus;punctures strongly umbilicate, contiguous. – Antennae exceeding by abouttwo articles theapices of posterior angles of pronotum, serrated from the third article on; second small, globous, third sub-conical, fourth-tenth sub-triangular, longitudinally carinate;second and third, takentogether, long as the fourth; last sub-ellipsoidal. (Fig. 42).

Pronotum. – 1.05-1.06x longer than wide, widest at the apices of the posterior angles, strongly convex with a vestige of a very shallow median impression immediately before the basal slope; sides sub-parallel, tapering immediately before the anterior margin, slightly sinuate before the posterior angles, the latter, long, acuminate just divergent, bicarinate; carinae short, the inner more sharp, the outer at a lower level and very fine; lateral margins complete, not visible in a dorsal view; punctuation very coarse and dense; puncture umbilicate,with shortest intervals to contiguous on all the surface.

Elytra. – 2.9x longer than pronotum and 2.7x longer than wide, as wide as the pronotum at base, strongly convex; sides very gradually and regularly tapering from the base to behind the middle; apices rounded; striae well marked, interstriae flat, with rough, microgranulated surface.

Aedeagus. – As in the Fig. 20 (length 2.18 mm).

Size. – Length 11.2-14.7 mm, width 2.81-3.5 mm.

Female. – Shorter antennae not reaching the apices of posterior angles of pronotum, pronotum more convex, slightly dilated in the anterior third. – Length 12.5 mm; width 3.0 mm (female).

Etymology. – The name is derived from the black integuments colour of the species.