Intybia quadristrigata (Champion, 1921) 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 : 106-108

Intybia quadristrigata (Champion, 1921) comb. n.

( Figs 6–12 )

Laius quadristrigatus Champion, 1921b: 194 , 203–204, fig. 6; Wittmer 1941: 223; 1953: 220. Philippines: Luzon.

Material examined. 1 male, Philippines: E of Luzon Island , Cagayan Valley , Quirino Province, Nagtipunan , 16°13′N 121°36′E, Aug. 2014, coll.—? ; 1 female, ibidem, April 2014, coll.—?; 1 female, idem, Sierra Madre Mountain Range, Tapsoy , 16°17′N 121°35′E, Aug. 2014, coll.—?

Description. Male ( Fig. 6 ). Body elongate, ovoid, subparallel, expanded posteriorly just behind humeri.

Head, pronotum, prothorax testaceous, and scutellum testaceous with black tip. Antennae black, except yellow body of 1st–3rd basal segments and black outer sides. Elytra black with typical spotted pattern: one wide slightly semi-lunar suboval white spot above the middle not reaching outer margin or suture and two white spots below the middle near the apex, one as vertical narrow slightly curved line near suture, and another one large, oval, also vertical, near outer margin, but not attached to it. Underside of body, except prothorax and head, black; legs dark brown with yellow anterior femora and tarsi, and two apical segments in intermediate and posterior tarsi. Surface evenly covered with short semi-erect light pubescence and sparse erect hairs. Vesicles and thoracic mesepimera testaceous.

Head slightly narrower than pronotum, elongate, eyes small, round, protruding, but not stretched, frons flat; interocular area with thin longitudinal carina in the middle, genae slightly impressed and oblique; clypeus extremely narrow due to very close settled antennae, not elongate, transverse, straight; labrum not elongate, transverse; palpi simple with apical segment enlarged, subcylindrical, slightly narrowed posteriorly and cut at the tip, intermediate segments subtriangular, short; surface of head densely and coarsely punctured, with weak microsculpture, light pubescence dense, short and adpressed, dark hairs invisible.

Antennae filiform ( Fig. 7 ), 1.6 mm long, reaching the basal quarter of the elytra; 1st segment enlarged, subtriangular, angulate at the outer apical angle, 2nd segment small, round-oval, 3rd segment enlarged and flattened, wide and rounded, triimpressed, with curved tooth above near 2nd segment and short bunch of hairs in wider curved lamella of upper margin near the middle of the segment; 4th segment short and rounded, 5th–11th segments elongate and cylindrical, apical segment somewhat longer than previous, evenly narrowed and pointed at apex; surface evenly covered with short, light pubescence and sparse, semi-erect long light hairs on outer sides of antennomeres.

Pronotum not elongate, transversal, barrel-shaped with not marginate lateral sides, each with small denticle in the middle; very slightly narrowed from middle to base, anterior and posterior sides marginate and straight, disc slightly convex and narrowly depressed at base; surface dull, densely punctate with distinct microsculpture, surface sparsely covered with fine, short, light adpressed and more strong erect hairs.

Scutellum small, narrow, rectangular, transversal, with slightly emarginate apex, almost completely covered by pronotum, sparsely punctured, shiny, sparsely pubescent.

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

Hind wings normally developed.

Legs elongate and thin; posterior femora not reaching elytral apices; all tibiae thin, straight, femora narrow, slightly compressed, not curved; all tarsi 5-segmented, compressed, except for depressed claw segments, 2nd segment in anterior tarsi simple, lacking comb, claw-segment longest and widest in all legs and equal to 1st–3rd segments in all legs; claws small, thin, narrow and sharp, with small 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, emarginate at the middle of apical side ( Fig. 8 ); ultimate abdominal ventrite bilaciniate, narrow, transverse ( Fig. 9 ); aedeagus simple, with slightly convex apical part and stretched and dorsally curved tip (lamella), a longitudinal tube in centre of the aedeagus and several long and short straight spines combined in a row along the tube at apical half and a group of 4–5 spines at base are visible inside endophallus ( Fig. 11 ); tegmen short, wide, with extremely short thin and pointed parameres 6.0 times shorter than the base of tegmen ( Fig. 10 ).

Length 2.8 mm, width (at elytral base) 0.9 mm.

Female. Differs from the male by its body being slightly wider posteriorly, not elongate head, not swollen and round 3rd antennal segments, which strongly elongate and just slightly longer than the 1st segment, 3rd and 4th antennal segments equal in length and short in comparison with 5th–11th. Hind wings normally developed. Length 3.0 mm, width (at elytral base) 0.9 mm.

Remarks. The species was originally described in the genus Laius , but simple, not stout and curved anterior legs and white pattern of elytra, allows one to exclude the species from this genus, while the simple not sculptured head determines its transfer to Intybia .

Distribution. The species was described from Luzon Island, Philippines, and known only from the type locality ( Fig. 12 ).

Figures

FIGURES 6 – 12. Intybia quadristrigata (Champion, 1921) comb. n., male, dorsal view (6); left antenna (7); pygidium (8); ultimate abdominal ventrite (9); tegmen (10); aedeagus, lateral (11); distribution map (12). Scale bar 0.5 mm.