Procraerus borneoensis, Platia & Pulvirenti, 2023

Procraerus borneoensis n. sp.

( Fig. 5, 26, 59)

ZooBank:http://zoobank.org/ 9F904319-00ED-425E-9402-770A7500FEB0

Holotype, ♂, Indonesia, East Borneo , Pajau River, E. Mjöberg ( NHRS).

Diagnosi s. – A species of the P. asper -group sensu Schimmel, 1999, allied to P.rugipennis (Candèze, 1889) from Sumatra, it can be separated for the longer antennae and slenderer aedeagus.

Description. – Male.

Very moderately shiny.

Coloration. – Head, pronotum, scutellum dark-brown with vague blackish shades; elytra just a little lighter too with vague blackish shades; prosternum blackish, propleura, thorax and abdomen dark ferruginous; antennae dark brown with the apices of the last article yellowish; legs yellowish; covered with dense, recumbent, yellow-fulvous pubescence.

Head. – Frons convex from the vertex to near the anterior marginwhere is slightly impressed, anterior margin, shiny, regularly curved, directed downwards and just protruding above the clypeus; punctures strongly umbilicate, contiguous or with shortest intervals. – Antennae exceeding by about one article the apices of the posterior angles of pronotum, slightly serrated from the fourth article on; second and third articles sub-cylindrical and subequal in length, taken together, clearly shorter than the fourth; fourth-tenth triangular with the fourth a little longer than the following, longitudinally carinate, last longer than the previous, sub-ellipsoidal. (Fig. 26).

Pronotum. – Long as wide, widest at the apices of the posterior angles, convex, witha widebut shallowmid-longitudinal depression onthebasal slope; sides from behind the middle gradually and regularly tapering to the apices, very slightly sinuate to the posterior angles, the latter long, very acuminate, slightly divergent, bicarinate; carinae at the same level, the inner shorter, directed forwards and parallel to the outer, the latter a little longer, gradually diverging from the lateral margins, this complete and visible in a dorsal view only in the first thirds of its length; punctuation coarse and very dense, punctures strongly umbilicate on all the surface,contiguous or with shortest intervals.

Scutellum . – Tongue-shaped, ridged at base, convex and punctured.

Elytra. – 2.8x longer than pronotum and 2.8x longer than wide, convex; rather flattened on the disk; sides very gradually but regularly tapering from the base to the apices, these entire but crenulate; striae regularly marked and punctured; interstriae flat with rough surface.

Aedeagus. – As in the Fig. 5 (length 0.9 mm).

Size. – Length 7.5 mm; width 1.81 mm.

Female. – Unknown.

Etymology. – The name is derived from Borneo, where the species was collected.