Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 94. (Budapest 2002)

Ahrens, D.: Notes on distribution and synonymy of sericid beetles of Taiwan, with descriptions of new species (Coleoptera, Scarabaeoidea: Melolonthidae)

Description - Length: 7.3-7.7 mm, width: 4.0-4.1 mm, length of elytra: 4.9-5.1 mm. Body oblong, blackish brown, antenna brown, dorsal surface very shiny, ventrally dull, glabrous, except for a few setae on the head. Labroclypeus short, transversely subtrapezoidal, widest at base, lateral margins slightly curved and convergent to broadly rounded anterior angles, lateral border and ocular canthus produce an indistinct blunt angle, margins moderately reflexed, anteriorly very shallowly sinuate medially; surface plain, finely and densely punctate, distance between punctures less than their diameter, with a few moderately long, erect hairs; frontoclypeal suture indistinctly incised and weakly angled medially; smooth area in front of eye approximately four times as wide as long; ocular canthus moderately short and broad, densely and finely punctate, with two long hairs. Frons with moderate, somewhat dense punctures, with sparse, long hairs. Eyes large, ratio of diameter/interocular width: 0.86. Antenna 10-segmented; club with three segments, in male distinctly longer than the remaining segments combined. Mentum anteriorly elevated and flattened. Pronotum moderately transverse, widest at base, lateral margins in basal half subparallel and straight, in anterior half slightly curved and convergent anteriorly, anterior angles moderately produced and sharp, anterior margin medially with fine marginal line and straight; surface very densely and finely punctate, with microscopic hairs in the punctures; anterior and lateral border densely setaceous. Scutellum slender, triangular, dull, with fine and moderately dense punctures and with microscopic setae in the punctures. Elytra oblong, widest behind middle, striae indistinctly impressed and coarsely and densely punctate, intervals coarsely and densely punctate, even intervals flat, odd intervals weakly convex and with punctures concentrated along striae, odd intervals with a few fine and long hairs, some punctures with microscopic setae; epipleural edge robust, ending at strongly curved external apical angle of elytra, epipleura densely setose, apical border membranous, without microtrichomes. Ventral surface with very large and dense punctures, sparsely hairy, metacoxal plates laterally with numerous long hairs; each abdominal sternite with a transversal row of coarse punctures bearing short hairs between fine and dense punctation, penultimate sternite apically with very narrow smooth chitinous border, not a quarter as long as sternite. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/ metacoxa: 1/1.5. Pygidium strongly convex, dull, coarsely and densely punctate, without smooth midline, with numerous long hairs, some punctures with microscopic setae. Legs moderately slender; femora with two longitudinal rows of hairs, coarsely and moderately densely punctate; metafemur shiny, sharply edged anteriorly, with a continuously serrated line immediately beside anterior edge, punctation denser behind posterior longitudinal row of hairs, punctures with microscopic setae, posterior margin slightly concave, neither dorsally nor ventrally serrated, without longer hairs. Metatibia very broad and short, widest before apex, ratio of width/ length: 1/2.1, sharply edged dorsally, with two groups of spines, basal one slightly behind middle, apical one at 4/5 of metatibial length, in basal third beside dorsal edge with a continuously serrated line, ending at 4/5 of metatibial length, in apical two-thirds line very close to dorsal edge, with three single hairs basally along the line; outside weakly longitudinally convex, with moderately dense, large superficial punctures, each bearing long yellow hairs; ventral edge with four strong spines equidistant from each other, inside completely smooth and glabrous, apex interiorly near tarsal articulation shallowly and concavely sinuate. Tarsal segments dorsally impunctate, ventrally with sparse, short setae; metatarsal segments ventrally with a strongly serrated ridge, first metatarsomere distinctly shorter than the two following segments combined and only slightly longer than the upper tibial spur. Protibia short, bidentate, external teeth small, all claws symmetrical, strongly curved and moderately long. Aedeagus: Figs 24-27.