Plaesius (Hyposolenus) laevigatus Marseul, 1853: 228.
Redescription (Ohara & Mazur, 2000).
Body oblong oval, depressed medially, black and shining; antennal club, maxillary palpi, tarsus and setae of tibiae reddish brown. Biometric data are given in Table 2.
Antennal club (Fig. 14B) with V-shaped suture, which are complete and distinct. Ratio in width of pronotum to head about 2.52. Front of head (Fig. 14A) feebly depressed; surface sparsely covered with microscopic punctures that are separated by three to six times their diameter. Frontal stria of head shortly interrupted at middle and sinuate at lateral angle. Supraorbital stria absent. Labrum transverse and short, the anterior margin sinuate outwardly. One denticle present on inner margin of mandible.
Pronotum (Fig. 14C) feebly depressed medially; marginal stria completely and distinctly impressed laterally and anteriorly; outer lateral pronotal stria completely and deeply incised. Surface of pronotum evenly covered with microscopic punctures that are separated by about five times their diameter. Antescutellar area with a impression.
Epipleura with marginal stria on medio-apical fourth. Elytral marginal stria complete on epipleura, its inner edge cariniform; the apical end of stria extended inwardly along posterior margin of elytron and connected with the apical end of sutural stria at posterior inner corner of elytron. External subhumeral stria (Fig. 14C) almost complete but shortly interrupted on posterior sixth, coarsely crenate medially and sinuate on basal third. Internal subhumeral stria present on apical half and coarsely crenate. Oblique humeral stria slight impressed on basal third. First dorsal elytral stria distinctly incised on basal half but represented by coarse punctures on apical half; 2nd stria represented by 7 or 6 coarse punctures on apical third; 3rd stria short, represented by 3 coarse punctures on apical sixth; 4th and 5th striae absent; sutural stria shortly present on apical eighth and densely crenate by moderately sized punctures; posterior stria incised along posterior margin of elytron (conected with sutural and elytral marginal striae) also densely crenate. Surface of elytra sparsely covered with microscopic punctures.
Propygidium (Fig. 14C) densely covered with round, large and deep punctures that are separated by about half their diameter, the punctures becoming smaller medially; disc with a deep excavation on each postero-lateral area. Pygidium densely covered with large, round and deep punctures that are separated by their own diameter to half the diameter; surface of disc with feeble impression behind anterior corner.
Prosternal lobe (Fig. 14D) broad and feebly convex medially, its anterior margin arcuate outwardly, the median portion straight; marginal stria well impressed and interrupted medially, its outer edge subcariniform; surface evenly covered with fine punctures that are separated by two to four times their diameter, and irregularly and coarsely punctate medially. Prosternal process flat and finely punctate, with two distinct carinal striae but abbreviated on posterior sixth, the striae sparsely and coarsely punctate, divergent on posterior half, their outer edges cariniform; posterior margin round. One lateral prosternal stria present, its outer edge strongly carinate.
Mesosternum (Fig. 14D) transverse and feebly depressed medially and antero-laterally; surface sparsely and finely punctate, the punctures separated by seven to ten times their diameter; anterior margin deeply emarginate at middle; marginal stria of mesosternum usually complete and abbreviated laterally on posterior eighth, but sometimes shortly interrupted at middle, its outer edge subcariniform; another short stria present behind antero-lateral angle. Meso-metasternal suture finely impressed and arcuate anteriorly. Intercoxal disc of metasternum evenly covered with fine punctures that are separated by about five times their diameter. Lateral metasternal stria extending posteriorly, its outer edge cariniform, the apical end attaining nearly to posterior two-thirds of metasternal-metepisternal suture. Post-mesocoxal stria absent. Lateral metasternal disc sparsely covered with transverse rugae, the anterior edges of the rugae subcariniform; area on posterior three-fourths of lateral disc projected posteriorly.
Intercoxal disc of 1st abdominal sternum (Fig. 14D) with similar punctation of intercoxal disc of metasternum; one stria present on each side, arcuate and convergent anteriorly, its outer edge subcariniform. Lateral disc covered with longitudinal oblique rugae on inner half and coarsely punctate on outer half.
Protibia (Fig. 14E, F) with two large denticle on outer margin; dorsal surface with a deep sinuate tarsal groove and a longitudinal stria along inner margin; on ventral side, about 50 robust spines densely present on apical margin which is deeply excavated, and about 10 spines present on lateral margin (the latter spines separated from the spines on apical margin); surface of ventral disc with several rugae on basal half, and striate along inner margin, the outer edge of the stria cariniform. Mesocoxa without carina. Meso- and metatibiae with about 50 and 55 robust spines on outer margin respectively, the spines forming 3 longitudinal rows and becoming sparser basally. Ventral surface of profemur with several coarse punctures on apico-posterior fourth.
Male genitalia (Fig. 15). Eighth sternite divided into two lobes, which are not prolonged apically. Ninth tergite without stick-like antero-lateral projections. Spicule Y-shaped. Ratio in length of parameres to basal piece about 1.8; basal piece short. Lateral sides of parameres parallel, thence divergent on apical eighth, the apex of parameres truncate; parameres fused on dorsal surface, but shortly separated on apical eighth; angulation present on mid line at basal fourth of ventral surface. Median lobe simple.
Female genitalia (Fig. 14I, J). Spermatheca weakly sclerotized and round. Spermathecal duct very long and coiled.
Specimen examined. Indonesia. Borneo: 1 male, 1 female, Mt. Bawang, western Kalimantan, IV-1991; 1 male, 1 female, Nanga Obat, Putussibau, Kalimantan, V-1989. Sumatra: 1 male, Lampong, 1989. Java: 1 female, Kali Selogiri, Nr. Banyuwangi, 9-VIII-1986, T. Ito. Philippines. Palawan: 1 male, 4 females, Talabigan Barrio, Puerto Princesa, 24-III-1979, K. Wada; 1 male, Palawan, 1991. All specimens are deposited in SEHU.
Distribution. Java, Sumatra, Borneo, Philippines.
Fig. 14. Plaesius (Hyposolenus) laevigatus. A: Head. B: Antenna.
C: Adult, dorsal view. D: Ditto, ventral view. E: Left protibia,
dorsal view. F: Ditto, ventral view. G: Left mesotibia, ventral
view. H: Left metatibia, ventral view. I: Female genitalia, ventral
view. J: Spermatheca. (Ohara & Mazur, 2000).
Fig. 15. Plaesius (Hyposolenus) lavigatus. A: Aedeagus, dorsal view. B: Ditto, lateral view. C: 9th and 10th tergites and spicule, dorsal view. D: Ditto, lateral view. E: 8th tergite and sternum, dorsal view. F: Ditto, lateral view. (Ohara & Mazur, 2000).
MO-02-013P (Malayaia: Borneo, Sabah).