Penthoscapha pulverea, Riedel, Alexander, 2009

Riedel, Alexander, 2009, Revision of the genus Penthoscapha Heller (Coleoptera, Curculionoidea, Entiminae, Eupholini) with notes on the genera of Eupholini from New Guinea, Zootaxa 2224, pp. 1-29 : 22

Penthoscapha pulverea sp. n.

( Figs. 8–9, 24 , 29 , 35 , 50–52, 67 , 71 )

Diagnosis. Elytra densely setose, usually with ochre exocuticular pigments; striae regularly punctate, intervals even, without costae; sutural interval subapically without protrusion, only with loose cluster of setae ( Fig. 24 ).

Description. Holotype, male ( Fig. 8–9). Length. Total length 13.2 mm; pronotum + elytron 10.0 mm.

Coloration black except antennal scape and parts of legs dark reddish brown. Body sparsely setose with thin recumbent white scales; elytra densely setose with yellowish recumbent setae except sutural interval subglabrous; elytra evenly densely covered with ochre exocuticular pigments.

Head with faint lustre, dorsally sparsely setose, especially bordering eyes; between eyes 1.09 X as wide as vertical diameter of eye, densely punctate with small punctures, medially with longitudinal fovea; vertex simple, without median furrow. Eyes markedly prominent from outline of head. Gena subequal (0.97 X) to vertical diameter of eye.

Rostrum ( Fig. 35 ) 1.88 X longer than wide at base; maximum width in front of antennal insertion 1.36 X width at base. Dorsum relatively flat, with low median ridge bordered by very shallow furrows; in front of eyes with distinct sublateral impressions.

Antenna. Funicle + club 1.92 X length of scape; club 3.39 X as long as wide.

Thorax. Pronotum 1.05 X wider than long; sides gently sinuate, widest slightly in front of middle; disc densely punctate, weakly rugose, with shallow impression slightly in front of middle. Thoracic venter sparsely setose with thin setae.

Elytron medially free, 4.18 X longer than wide between humeri; at greatest width 1.18 X wider than between humeri; side evenly rounded; striae regular, distinct, moderately impressed; intervals flat, without longitudinal ridges; fine sculpture largely concealed by dense pubescence and exocuticular pigment ( Fig. 67 ), sutural interval sparsely setose, smooth, shining; sutural interval at apical declivity ( Fig. 24 ) with loose cluster of setae, without protrusion visible in lateral aspect. Ala ( Fig. 29 ) vestigial, length 8.8 mm, 1.24 X length of elytron.

Legs. Femora moderately long; metafemur in repose slightly exceeding elytral apex. Tibiae ventrally hardly denticulate; metatibia apically with subglabrous bevel; posterior distal comb of metatibia consisting of sparse simple row of stout setae, without “secondary mucro”. Tarsi elongate, tarsomere 1 of metatarsus 2.3 X as long as wide, tarsomere 2 1.1 X as long as wide.

Abdomen. Ventrite 1–2 weakly punctate, sparsely setose; ventrite 5 flat, sparsely setose, subapically with shallow impression, vestiture somewhat denser. Genitalia. Aedeagus ( Figs. 50–51) with sides subparallel beyond apical orifice, subapically hardly constricted, apex extended, rounded; In lateral aspect apical tip weakly curved dorsad. Transfer apparatus ( Fig. 52) ca. 2 X as long as wide at base.

Material examined. Holotype: WEST NEW GUINEA, Jayawijaya Reg., Kono, 2400 m, 19.IX.1992, leg. A.Riedel ( MZB).

Distribution ( Fig. 71 ). Jayawijaya Reg. (Kono). Elevation: 2400 m.

Biology. Beaten from bushy vegetation.

Etymology. This epithet is based on the Latin adjective pulvereus (dusty, powdery), which refers to the dense layer of granular exocuticular pigments on the elytra.

Figures

FIGURES 20 – 25. Elytral apex of Penthoscapha species, lateral aspect: (20) P. gerhardschereri, holotype; (21) P. gerhardschereri, allotype, arrow marking apical tooth; (22) P. l o re n t z i, lectotype; (23) P. doormanensis, holotype; (24) P. pulverea, holotype; (25) P. similis, holotype.

FIGURES 26 – 31. Left wing of Penthoscapha species: (26) P. t o x o p e i, paratype; (27) P. similis, holotype; (28) P. doormanensis, holotype; (29) P. p u l v ere a, holotype; (30) P. gerhardschereri, holotype; (31) P. l o re n t z i, lectotype.

FIGURES 32 – 35. Head and rostrum of Penthoscapha species: (32) P. l o re n t z i, lectotype (33) P. gerhardschereri, holotype; (34) P. doormanensis, holotype; (35) P. pulverea, holotype.

FIGURES 67 – 70. Detail of elytron of Penthoscapha species with exocuticular pigments [67 – 69], or with degenerate exocuticle [70]: (67) P. pulverea, holotype; (68) P. gerhardschereri, holotype; (69) P. doormanensis, holotype; (70) P. lorentzi, lectotype.

FIGURES 71 – 72. Distribution of Penthoscapha species.