Dryocoetiops salebrosus Beaver, Smith and Sanguansub, 2019

Beaver, Roger A., Smith, Sarah M. & Sanguansub, Sunisa, 2019, A review of the genus Dryocoetiops Schedl, with new species, new synonymy and a key to species (Coleoptera: Curculionidae: Scolytinae), Zootaxa 4712 (2), pp. 236-250 : 241-242

Dryocoetiops salebrosus Beaver, Smith and Sanguansub , n. sp.

(Figs 26–29)

Body. Piceous, 2.9–3.2 mm long, 2.31–2.33 times as long as wide.

Head. Frons convex, moderately shining, sparsely, finely punctured, granulate punctate anteriorly, the punctures with moderately long setae, fringe of dense setae on anterior margin of epistoma, indistinct elevated median line.Antenna with 4-segmented funicle (excluding pedicle); first segment of club extends one third of total length of club on anterior face, its apical margin transverse. Eyes of normal size, with upper part above emargination smaller than lower part, and not extending onto frons, finely faceted.

Pronotum. 0.86–0.91 times longer than wide, widest close to base, posterior angles broadly rounded, sides subparallel in basal half, broadly rounded anteriorly, anterior margin not tuberculate, summit slightly behind middle, a very weak transverse impression just behind it; anterior slope with numerous, densely placed asperities of variable size, arranged more or less concentrically, larger and more elevated in antero-lateral areas, smaller towards summit, apex of asperities rounded; disc dull, densely granulate, the granules tending to be aligned in concentric rows, becoming rugulose at posterior angles; vestiture of moderately long, erect setae on anterior slope and margin, and at sides.

Scutellum. Shining, linguiform.

Elytra. 1.50–1.55 times as long as wide. 1.8–2.0 times as long as pronotum, slightly wider than pronotum at base, sides subparallel in basal 3/4, then angularly rounded to apex; striae impressed, wider than interstriae; strial punctures very coarse, biseriate on striae 1, except in basal third of elytra and apical part of declivity; striae 2 uniseriate at base and on posterior part of disc, but biseriate for a short distance in middle of disc and on declivity except close to apex, outer interstriae uniseriate; interstriae narrow, especially on declivity, where strongly raised with a single, regularly placed row of large, pointed granules extending to apex; disc of elytra almost glabrous apart from short setae near elytral margins, declivity with minute, fine setae in strial punctures, and a short, stouter, erect seta arising behind each granule on interstriae.

Metaventrite with a row of fairly closely spaced sclerolepidia along its dorsal margin.

Legs. Anterior tibia narrowed toward apex with 4 socketed teeth in apical third. Procoxae contiguous.

Type material. Holotype: Female : BRUNEI, E 115.70 o, N 4.34 o, Kuala Belalong FSC, Dipterocarp forest, Dryobalanops beccarii , aerial FIT 4, 270m alt., 7.vi. [19]91, N. Mawdsley, NM192, ( BM ( NH) 1991–173) ( NHML).

Paratypes: Female: 3 specimens: same data as holotype (1 in RABC); as holotype except: aerial FIT 6, 275 m alt., 23.v. [19]91, NM168 (1); as holotype except: aerial FIT 1A, 260m alt., 8.vi. [19]91, NM183 (1) (both in NHML) .

Diagnosis. The species is unique in the genus in the very large strial punctures on the elytra, and the coarse, pointed granules on the elytral declivity. The punctures of striae 1 appear biseriate between the raised interstriae 1 and 2, except in the basal third of the elytra and the apical part of declivity; those of striae 2 are similarly biseriate on the upper part of the declivity. It resembles D. apatoides in the costate interstriae and strongly impressed striae 1–3 on the elytral declivity, but is easily distinguished from that species by its greater size and the unusual strial puncturation.

Etymology. The specific name is a Latin adjective meaning rugged or rough, and refers to the coarse sculpture of the elytra.

Distribution. Brunei Darussalam.