Microserica lineata Moser, 1915

Ahrens, Dirk, 2004, Revision of the Microserica lineata Moser, 1915 ­ group (Coleoptera: Scarabaeidae: Sericini), Zootaxa 667, pp. 1-14 : 2-4

Microserica lineata Moser, 1915 ( Figs 1–3 )

Microserica lineata Moser, 1915: 385 .

Type material examined: Syntypes: 1 ɗ “ India Pegu/ Microserica lineata typ. ɗ Mos.” ( ZMHB), 1 Ψ “ India Pegu/ Microserica lineata typ. Ψ Mos.” ( ZMHB), 1 ɗ, Ψ “ India Pegu” ( ZMHB).

Description. Length: 5.7 mm, length of elytra: 4.3 mm, width: 3.4 mm. Body oval, yellowish brown; frons and a median spot on pronotum dark and with greenish lustre, dorsal surface dull except shiny labroclypeus, almost evenly and moderately densely covered with minute setae, long, erect setae on elytra absent.

Labroclypeus subtrapezoidal and moderately short, widest at base, lateral margins convex and strongly convergent anteriorly, anterior angles broadly rounded, lateral border and ocular canthus produced into an indistinct obtuse angle, anterior and lateral margins moderately reflexed, anterior margin very weakly sinuate medially; surface weakly convex medially and shiny, finely and very densely punctate, with a few long, erect setae anteriorly; frontoclypeal suture indistinctly impressed and weakly curved; smooth area in front of eye twice as wide as long; ocular canthus short and triangular, almost impunctate, with a short single terminal seta. Frons glabrous with fine and dense punctures, laterally beside the eyes with a few long erect setae. Eyes moderately large, ratio of diameter/ interocular width: 0.57. Antenna yellow, with ten antennomeres; club with four antennomeres subequal in length, club little shorter than the remaining antennomeres combined. Mentum weakly convexly elevated in anterior third.

Pronotum moderately wide, widest in posterior third, lateral margins almost evenly curved and weakly convergent anteriorly, anterior angles distinctly produced and acute, posterior angles broadly rounded, anterior margin convexly produced medially, with a distinct and fine marginal line, basal margin without marginal line, surface with dense and fine punctures, along the midline and on disc partly punctures less dense, with adpressed white scale­like short setae in the punctures; anterior and lateral borders setaceous; hypomeron carinate, its basal margin not produced ventrally. Scutellum narrow and short, apex weakly rounded, with fine and dense punctures, smooth along midline, minute setae present in the punctures.

Elytra short oval, widest in posterior third, striae distinctly impressed and finely densely punctate, all intervals moderately convex and densely, irregularly but finely punctate, throughout with fine setae in the punctures, interior apical angle of elytron with a strong seta, margins, odd intervals, and a glabrous spot before apex dark, before apex with a dark glabrous spot; epipleural edge robust but convex, ending at the strongly convex external apical angle of elytra, epipleura densely setaceous, apical border broadly membraneous, with a rim of short microtrichomes.

Ventral surface dull, with fine and dense punctures, with dense short setae, setae adpressed; metacoxa minutely setose, laterally with robust adpressed setae; each abdominal sternite with indistinct transversal row of coarse and dense punctures, sternite bearing short strong setae between fine and dense punctation, all sternites bearing minute white setae. Mesosternum between mesocoxae almost as wide as mesofemur. Ratio of length of metepisternum/ metacoxa: 1/ 1.45. Pygidium little wider than long, moderately convex, with fine and dense punctures bearing fine white setae, on apical half with numerous robust punctures bearing robust and erect yellowish setae, without smooth midline.

Legs moderately slender; femora on ventral surface dull, finely and moderately densely punctate, glabrous, with two longitudinal rows of setae; anterior edge of metafemur acute, with a robust adjacent continuously serrated line, posterior margin weakly convex and glabrous, ventrally weakly widened in apical half but not serrate, posterior margin dorsally not serrate. Metatibia moderately slender and long, dorsal and ventral margin almost subparallel, ratio width/ length: 1/ 3.8, dorsally longitudinally convex, with two groups of spines, the basal group at one third, apical one at three quarters of metatibial length, basally with a few single spines in the punctures; lateral face longitudinally convex, with dense and moderately coarse punctures, along the middle of lateral face narrowly impunctate, punctures with minute setae; ventral edge sharp and serrated, with four strong and long, equally spaced spines, medial face impunctate and smooth, apex interiorly (near tarsal articulation) distinctly truncate. Tarsomeres dorsally glabrous and impunctate, ventrally with a very few sparse, short setae; metatarsomeres ventrally with a single strongly serrated carina, a subventral carina lacking, first metatarsomere little shorter than the following two tarsomeres combined and almost twice as long as the upper tibial spur. Protibia short, bidentate, protarsal claws symmetrical.

Aedeagus: Figs 1–3 .

Variability. Length: 5.7–6.0 mm, length of elytra: 4.3–4.5 mm, width: 3.4–4.0 mm. Ψ: Antennal club with three antennomeres and little shorter than the remaining antennomeres combined; pygidium apically strongly convex.

Figures

FIGURES 1 – 3: Microserica lineata Moser, 1915 (Syntype: Myanmar: Pegu); 1 — Aedeagus left side lateral view, 3 — Aedeagus right side lateral view, 2 — Parameres dorsal view. Scale: 0.5 mm. (llpphb — left lateral process of phallobase; ms — dorsomedian sinuation of phallobase; phb — phallobase; rpm — right paramere).