Hesperus rougemonti, Schillhammer, Harald, 2016

Schillhammer, Harald, 2016, Hesperus rougemonti sp. n. (Coleoptera, Staphylinidae) from Borneo, Zootaxa 4061 (2), pp. 197-200 : 197-200

Hesperus rougemonti sp. n.

Holotype ♂: “ SABAH Danum valley, B.R.L. f.i.t. 14–16.II.2007, G. de Rougemont” ( CRO)— Paratypes (2 spp.): 1 ♂ with same label data as holotype ( NMW); 1 ♀: “ Malaysia: Sabah, Lahad Datu, Ulu Segama, Frst. Res., Danum Valley F.C., 04°57.9’N 117°48.1’E, 200 m alt., 24.xi.2005, 1 ° frst., coll. Mann & Slade \ Flight Interception Trap, Lowland, mixed Dipterocarp frst, Nature Trail Area, frst interior, OUMNH-2006-051” ( OUMNH).

Description (Habitus: Fig. 1): 9.5–12.5 mm long (4.7–5.3 mm, abdomen excluded). Head black; antennae with segment 1 pale yellow, segment 2 and basal half of 3 reddish, segments 4–10 black, last segment reddish yellow; mandibles reddish brown, palpi yellowish, last segment of labial palpi usually darker reddish; pronotum orange red; elytra reddish in basal depression, remaining area pale yellowish, each elytron with a round, black spot, occupying about half-length of elytron, but not reaching suture and leaving broad yellow band along posterior margin yellow, shortly extending onto hypomeron; scutellum reddish; prosternum, meso- and metaventrite reddish; abdominal segments III–V (first three visible) reddish, segment VI black with anterior and posterior margins broadly reddish yellow, segment VII likewise but posterior margin extremely narrowly reddish yellow, segment VIII black, parts of tergites VI–VIII strongly iridescent; segments IX and X pale yellowish; legs entirely pale yellow.

Head trapezoid, markedly transverse in males (1.64–1.68 times as wide as long), less so in the female specimen (1.46 times as wide as long); eyes longer than tempora in males (ratio 1.35–1.47), about as long as tempora in the female specimen; dorsal surface with large, slightly impressed punctures, roughly forming two sinuate rows on each side, one about half way between midline and eyes consisting of about 6 punctures, another one along medial margin of eye and continuing onto temple, consisting of approximately 8 punctures; surface without any traces of microscultpure, thus shiny; antennae rather short, segments 4 and 5 about as long as wide, subsequent segments becoming gradually shorter and slightly to more distinctly transverse, segments 6–10 slightly asymmetrical, subserrate, last segment almost as long as segments 9 and 10 combined.

Pronotum about as long as wide, inconspicuously transverse in the large male (holotype), widest close to anterior angles, narrowed toward base in straight line or shallow concave arc; dorsal surface moderately densely, irregularly punctate, size of punctures similar to those on head, also impressed, surface without any trace of microsculpture, shiny.

Elytra moderately densely, rather coarsely punctate, punctures not impressed, separated by a minimum of 2 puncture diameters; large male with weak indication of a lateral carina in posterior half.

Abdominal tergites III–V with two basal lines.

Aedeagus ( Figs. 2–4 ) almost identical to that of H. wemmeri Schillhammer , but apical portion of paramere longer, occupying about half length of paramere; basal portion more distinctly constricted, thus apical portion appearing more dilated.

Diagnosis. Externally, H. rougemonti is unique among the species with multicolored elytra by the pale yellowish ground color of the elytra and the rather small black marking. In the only species with a similarly sized black elytral marking, H. susannaekontrusae Schillhammer , the ground color of the elytra is reddish testaceous and the tergite VI is entirely reddish.

Distribution. The species is at present known only from the type locality.

Etymology. The species is named in honor of Guillaume de Rougemont who collected two of the three type specimens.

Figures

FIGURES 2 – 4. Hesperus rougemonti Schillhammer; aedeagus in ventral (2) and lateral (3) view, apex of paramere (4).