Hexarhopalus (Leprocaulus) barclayi, Purchart, Luboš, 2010

Hexarhopalus (Leprocaulus) barclayi sp. nov.

( Fig. 1 View FIGURES 1 – 6 )

Type locality. Borneo, Sarawak, Mt. Poi.

Type material. Holotype (♂ BMNH): Borneo: Sarawak, Mt. Poi, 5.000´[feet], Dr. E. Mjoberg // Brit. Mus., 1924 – 333. Paratypes (2 ♀♀ BMNH): same data as holotype, but 5.350´[feet].

Condition of paratypes: First PT – left middle leg, right front leg and left front tarsus missing. Second PT – left front tarsus missing.

Differential diagnosis. The new species most closely resembles H. kaszabi Beĕvář & Purchart, 2008 from which it differs, besides the character mentioned in the key, as follows: elytral interstriae less convex, pronotum almost globular (with rounded sides) and densely punctate, space between meso- and metacoxa approx. 1.2 times as long as the diameter of mesocoxa (in H. kaszabi elytral interstriae more convex, pronotum subparallel sided, moderately punctate, space between meso- and metacoxa approx. 1.8 times as long as the diameter of mesocoxa).

Description. Size of holotype 10.6 x 4.3 mm. Dark brown, slightly shiny, with antennae, labrum, palpi, tibiae and tarsi pale brown. Body elongate-subcylindrical, glabrous, smooth.

Head smooth, glabrous, shagreened, entire surface simply and relatively densely punctate. Narrower than pronotum in ratio 1: 1.5. Frontoclypeal sulcus at the base U-shaped, moderately deep, reaching the clypeal margin. Distance between eyes 2 times as wide as their diameter (DV). Ocular sulcus moderately deep. Antenna 1.3 times as long as pronotum.

Pronotum glabrous, smooth, shagreened, almost globular (with rounded sides), very slightly transverse, broadest at middle, PW:PL ratio is 1: 0.9. Entire surface of pronotum simply and densely punctate. The space between those punctures approximately as large as an eye facet. Base of pronotum rimmed and obliquely truncate anteriad towards posterior angles. Lateral carina completely obliterated. Oblique indentation in posterior angles short and deep. Anterior angles with slightly developed, but distinctly visible carina which continues along anterior margin of pronotum and ends at the lateral third of anterior margin. The rest of the latter obliterated. Prothoracic hypomeron glabrous, smooth, impunctate.

Elytra glabrous, smooth, elongate, subcylindrical, dilated posteriad, broadest in penultimate fourth, where it narrows towards the apex of elytra. 1.6 times as long as its width, 2.5 times longer and 1.4 times as wide as pronotum. Dorsum almost flat (LV), elytral declivity moderate. Elytral striae regularly and finely punctate. Elytral interstriae slightly but distinctly convex, especially at apex of elytra. Humeral shoulders developed. Base of elytra rimmed with moderately raised carina. Scutellum triangular.

Prosternum, mesoventrite and metaventrite glabrous, smooth and shagreened. The space between meso- and metacoxa slightly longer than the diameter of mesocoxa. Abdominal ventrites glabrous, smooth, shagreened, simply and relatively densely punctate.

Legs smooth, simply and finely punctate. Femora glabrous. Apical half of tibiae with moderately long yellowish setae underneath. Tarsi very sparsely pubescent above and with brush-like yellowish setae underneath.

Variability of size: 10.0– 10.8 x 4.2–4.3 mm.

Distribution. Borneo, Sarawak, Mt. Poi.

Etymology. Named in honour of my dear colleague Maxwell V. L. Barclay ( Great Britain), head of the Coleoptera section at the BMNH.