Bunbunius quadrihamis, Sehnal, 2013

Sehnal, Richard, 2013, Bunbunius quadrihamis sp. nov. from Sichuan province, China (Coleoptera: Scarabaeidae: Melolonthinae), Acta Entomologica Musei Nationalis Pragae 53 (2), pp. 649-655 : 650-652

Bunbunius quadrihamis sp. nov.

( Figs 1 –6)

Type material. HOLOTYPE: J, ‘ CHINA, Prov. SICHUAN / Strasse zwischen KANDING / und LUDING / Umg. DAHEDOU, 1910 m / leg. A. Puchner 1.-8.VI.2007 [p] // Bunbunius quadrihamis sp. n ., HOLOTYPUS,J, Richard Sehnal det. 2013 [p, red label]’ ( NMPC).

Description of holotype (J). Body length 17.2 mm. Head, pronotum and abdomen reddish brown, legs partly lighter, elytra pruinose ( Fig. 1 ). Antennae pale brown.

Clypeus distinctly broadly shovel-shaped, strongly punctured, rounded; fronto-clypeal suture upturned and incised. Punctures virtually without interspaces; setation fine, short, yellow and erect, setae issue from anterior thirds of punctures. Labrum bilobed, anterior angles obtuse but distinct. Frons strongly punctured, with shagreened facets between punctures; erect yellow setation longer than on clypeus; macrosetae longest at edge of clypeus and around eye canthus. Eyes normal (large), exceeding genae externally in dorsal aspect; distance between eyes in ventral aspect longer than diameter of eye. Genae rugo-punctate, with group of long macrosetae. Antennae decamerous, antennal club straight and as long as antennal shaft (antennomeres I–VII). Antennomere I as long as antennomeres II and IV combined, antennomeres VI and VII with drop-shaped caruncula ( Fig. 2 ), long macrosetae, club totally densely punctate, without smooth areas. Terminal maxillary palpomere elongate, longer than palpomeres 2 and 3 combined, widened in middle, apex obliquely angular and concave through much of surface, oval alutaceous area tapering toward apex.

Pronotum weakly convex, approximately heptagonal, 1.6 times wider than long, broadest approximately in posterior third, with very finely impressed medial line; glabrous except on lateral margins. Anterior and posterior angles rounded but posterior poorly defined. Surface without macro- and microsetae. Dense punctation consisting of punctures of equal size, with glossy facets in between as large as punctures themselves. Disc with a small impunctate facet. Anterior halves of lateral margins finely crenulate, with long, yellowish-brown macrosetae issuing from crenulations.

Scutellar shield wider than long, triangular; without macrosetae, with punctures of two sizes grouped into two mutually separate areas ( Fig. 3 ).

Elytra moderately convex, slightly dilated posteriorly. Elytral disc, sides and lateral margin rugately striate, without setation. Punctures only in rugae, often set in longitudinal rows.

Macropterous.

Legs. All femora shiny, slightly and irregularly punctate. Protibia tridentate, claws gently curved and rugate throughout length, each with a distinct small tooth in proximal third ( Fig. 4 ). Mesotibiae and metatibiae expanded distally, with two longitudinal carinae internally; distal edge with row of long macrosetae of equal length, terminal calcars stout, long, lower calcar shorter than upper, upper calcar longer than first metatarsomere.

Abdominal sternites ochre brown, with fine, short, recumbent, white macrosetae. Sternites glossy, finely punctate. Pygidium concave, rugately striate, on margins with short, semierect macrosetae.

Male genitalia ( Figs 5 –6). Aedeagus symmetrical, central lobe conical, apex widely rounded. Two pairs of long, narrow, undulate spinules terminate in medially curved hooks.

Female. Unknown.

Differential diagnosis. Habitually, Bunbunius quadrihamis sp. nov. is close to B. pseudoopacipennis and B. prunellus . These three species differ in antennal proportions, pronotal morphology, shape of the aedeagus and distribution. The new species has the antennal club as long as antennomeres I–VII, B. pseudoopacipennis has the male club as long as the funicle, and B. prunellus has the male club as long as the scape and funicle combined. The new species has the medial lobe of the aedeagus conical with apex widely rounded, B. pseudoopacipennis has the medial lobe triangular with apex sharp and spinules blunt, and B. prunellus has the medial lobe triangular with both apex and spinules sharp. Bunbunius quadrihamis sp. nov. is known from China (Sichuan), B. pseudoopacipennis from Taiwan and B. prunellus from Myanmar and China (Yunnan).

Etymology. From Latin quadri (= four) and hamis (= hook-shaped), referring to spinules extending from the endophallus and parameres.

Geographical distribution. China (Sichuan).

Figures

Figs 1–5. Bunbunius quadrihamis sp. nov., holotypeJ: 1 – habitus, dorsal view; 2 – antenna, dorsal view; 3 – scutellum, dorsal view; 4 – claw, medial view; 5 – aedeagus, dorsal view; 6 – aedeagus, lateral view. Scale bar: 1.0 mm.