Intybia birmanica (Champion, 1921)

Tshernyshev, Sergei E., 2016, Taxonomic revision of Intybia Pascoe, 1886 species (Coleoptera, Malachiidae) of Thailand and Philippines, Zootaxa 4147 (2), pp. 101-123 : 110-112

Intybia birmanica (Champion, 1921)

( Figs 20–26 )

Laius birmanicus Champion, 1921a: 338 –339, plate 8, fig. 18; 1921b: 207; Intybia birmanica (Champion, 1921) : Wittmer 1997: 205 –206, figs. 82–86.

Material examined. Thailand: 1 male—Chiang Mai Province, 56 km NW Chiang Dao, 19°05′N, 99°22′E, 7– 14.6.1995, leg. M. Snizek.

Description. Male ( Fig. 20 ). Body elongate, parallel, slightly expanded at about the middle.

Pronotum and prothorax testaceous. Antennae black, except for yellow ventral part of 1st and 2nd and 3rd basal segments. Elytra black with weak violaceous metallic lustre and two rufous-yellow fasciae, one outwardly widened transverse fascia before the middle, and narrow transverse fascia before apex, both markings narrowly connected along suture. Underside of body black, with margins of ventrites yellow; legs black with dark brown tarsi, coxae and trochanters black. Surface evenly covered with dense short semi-erect light-gold pubescence and sparse long erect dark hairs. Vesicles yellow, thoracic mesepimera black.

Head narrower than pronotum, slightly elongate, eyes small, slightly protruding, frons flat; genae short and straight; clypeus not elongate, transverse, straight; labrum weakly elongate, transverse; palpi simple with apical segment cone-shaped, slightly widened posteriorly and obliquely cut at the tip; surface of head sparsely and coarsely punctured, with weak microsculpture, light pubescence dense, short and adpressed, dark hairs sparse and erect, distinct behind eyes.

Antennae filiform ( Fig. 21 ), 1.6 mm long, reaching base of the elytra; 1st segment enlarged, triangular, slightly angulate at the outer apical angle, 2nd segment small, round-oval, segment 3 enlarged, almost completely quadrate, slightly depressed in middle, sharply protruding below and rounded at upper side which possessing short bunch of hairs; 4th–10th segments somewhat elongate and subcylindrical, 11th segment 1.3 times longer than previous, slightly stretched at apex; surface evenly covered with short, light pubescence and sparse, semi-erect long light hairs on outer sides of antennomeres.

Pronotum longitudinal, strongly narrowed behind middle to base, anterior margin convex, posterior margin straight, disc with strong transverse depressions before base, anterior and posterior sides distinctly marginate; surface dull, densely punctate, especially on sides, microsculpture indistinct, surface sparsely covered with fine, short, light adpressed and strong long erect dark brown hairs.

Scutellum small, rectangular, narrow, slightly elongate, rounded at apex, almost completely covered by pronotum, sparsely punctured, shiny, sparsely pubescent.

Elytra suboval and subparallel, widened just behind the base and slightly narrowed posteriorly, at base distinctly wider than pronotum; humeri distinct, suture distinctly marginate; apices evenly rounded, simple; surface dull, with dense and coarse punctures and distinct microsculpture, sparsely covered with double pubescence, goldish short adpressed and strong brown erect hairs.

Hind wings normally developed.

Legs long, thin; posterior femora not reaching elytral apices; all tibiae thin, straight, femora narrow, slightly compressed, not curved; all tarsi 5-segmented, narrow and elongate, 2nd segment in anterior tarsi simple, lacking comb, claw-segment longest in all legs and equal to 1st and 2nd segments in anterior tarsi, 1.1–1.3 times longer than 1st and 2nd in intermediate and posterior; claws thin, narrow and sharp, with very small tooth-like membrane at base.

Ventral body surface densely punctate, dull, evenly covered with sparse fine, depressed dark pubescence. Metathorax slightly swollen, simple, lacking appendage. Pygidium short, transverse, evenly rounded at apex and possesses row of black hair at apical margin ( Fig. 22 ); ultimate abdominal ventrite bilaciniate, narrow, transverse, also with several brown hair apically ( Fig. 23 ); aedeagus simple, not curved, straight, evenly narrowed at apex with round and slightly curved downwards lamella, central tube along the aedeagus with two rows of curved denticles from both sides at the apex and “ammunition belt”-shape group of small denticles around base of the tube are visible inside endophallus ( Fig. 25 ); tegmen short, wide, with short thin and pointed parameres 4.4 times shorter than the base of tegmen ( Fig. 24 ).

Length 3.3 mm, width (at elytral base) 1.0 mm.

Female. Differs from the male by its slightly larger size and not strongly modified 1st and 3rd antennal segments, which are not elongate, subtriangular and equal in length. Length 3.7 mm, width (at elytral base) 1.1 mm.

Remarks. The species was little known due to brief description. This is the first detailed re-description and illustration. This is a first record of the species in Thailand.

Distribution. China: Yunnan, Laos, Myanmar, Thailand ( Fig. 26 ).

Figures

FIGURES 20 – 26. Intybia birmanica (Champion, 1921), male, dorsal view (20); left antenna (21); pygidium (22); ultimate abdominal ventrite (23); tegmen (24); aedeagus, lateral (25); distribution map (26). Scale bar 0.5 mm.