Dilobitarsus pendleburyi Fleutiaux, 1934

Arimoto, Koichi, 2016, Rediscovery and redescription of Dilobitarsuspendleburyi (Coleoptera, Elateridae, Agrypninae) from Southeast Asia, ZooKeys 593, pp. 37-48 : 38-45

Taxon classification Animalia Coleoptera Elateridae

Dilobitarsus pendleburyi Fleutiaux, 1934 Figures 1, 2-6, 7-11, 12-16, 17-22, 23-29, 30-38

Dilobitarsus pendleburyi Fleutiaux, 1934: 178 (original description; type locality: Near Sandakan, Bettotan, Sabah, Northern Borneo, Malaysia); Hayek 1973: 99 (generic review; examination of the holotype).

Type material.

Holotype: Male, 13 VIII 1927, Near Sandakan, Bettotan, Sabah, Northern Borneo, Malaysia. (BMNH).

Non type materials.

1 male, Fraser’s Hill, Pahang, Malaysia, 9 V 2010, K. Matsuda leg. (CAR); 1 female, Harau Valley, near Payakumbuh, West Sumatra, Indonesia, 15 VIII 1992, A. Sarimudanas leg. (CAR).

Distribution

(Fig. 1). Oriental Region: Malaysia (Borneo, the Malay Peninsula), Indonesia (Sumatra). New records from the Malay Peninsula and Sumatra.

Measurements.

Male [holotype]; BL: 11.75 [11.51], BW: 3.14 [3.03], PL: 3.61 [3.58], PML: 3.04 [3.20], PW: 2.89 [2.91], PL/PW: 1.25 [1.23], EL: 7.76 [7.53], EW: 3.14 [3.03], EL/EW: 2.47 [2.49]. Female; BL: 15.21, BW: 3.92, PL: 4.70, PML: 4.08; PW: 3.77, PL/PW: 1.25, EL: 9.65, EW: 3.92; EL/EW: 2.46.

Diagnosis.

Setae narrow and scale-like in black, white and orange (Figs 2, 7, 8); head with frontal carina V-shaped (Figs 3, 12); nasal plate high laterally and divided medially by a short vertical carina (Figs 3, 12, arrow); pronotum with four tubercles (Fig. 10, black arrows); hypomeron concave longitudinally along pronotosternal suture (Fig. 13, white line); posterior margin of hypomeron with three notches at inside (Fig. 15, white arrows); metasternum depressed for reception of mid tarsi; elytra with two tubercles (Fig. 10, white arrows); parameres of aedeagus not constricted basal to lateral subapical barb (Figs 27-29); apex long (Figs 27, 28); sclerotized plate in bursa copulatrix U-shaped, and with long teeth (Figs 36-38).

Redescription.

Adult. Body (Figs 2, 7, 8) elongate, convex; surface smooth, shining, with large punctures; black-brown to red-brown, but mouth-parts yellow-brown with mandible black-brown. Setae. Body covered with narrow scale-like setae; bases of tarsal claws each with a thick seta. Head and pronotal anterior part with orange setae; pronotum with black setae at the center, with white setae posteriorly; elytra with in termixed white and black setae, together with white U-shaped setal apical band; setae at pronotal and elytral tubercles denser and erect; ventral surface with white setae, but abdominal ventrites partially with dense orange setae (Fig. 9).

Frons (Figs 3, 12) depressed mesally; frontal carina V-shaped in anterior view; nasal plate high laterally (higher in non-type), divided medially by a short vertical carina (longer in non-type, Fig. 12, arrow). Labrum (Fig. 17) semicircular, with long setae apically. Antennae (Fig. 18); male: extended beyond pronotal posterior apices by length of antennomere 11; female: not reaching pronotal posterior apices by distance equal to length of antennomere 11; relative antennomere lengths: II<III-X<XI<I; antennomere I cylindrical; antennomeres III-X serrate; antennomere XI oblong ovate. Mandible (Fig. 19) bidentate; penicillum developed, formed by dense short setae; dorsal sinuous carina developed; concave ahead of posterior condyle. Maxilla (Fig. 20); basistipes subrectangular (Fig. 21), with three long setae; mediostipes with sinuous posterior margin, with a median longitudinal carina (Fig. 21); galea and lacinia brush-like; palpus short, pilose. Labium (Fig. 22); mentum trapezoidal, translucent anteriorly, with two long setae; prementum with rounded anterior margin, with a median anterior notch shallow, with a transverse row of setae; apical palpomere hatchet-shaped, short.

Prothorax longer than wide; anterior angles acute; lateral carina complete; sides rounded posteriorly, constricted anterior to hind angles. Pronotum; disk with four tubercles elevated strongly (Fig. 5) (to weakly, Fig. 10, black arrows); punctures at tubercles small and dense; posterior angles short, without carina; base elevated medially. Prosternum (Fig. 13) convex medially, with carinae extending anterad of coxal cavities (Fig. 14); anterior edge carinate, with anterior lobe prominent, reaching to level of apices of anterior angles of prothorax; prosternal spine weakly inclined dorsally behind procoxae, flattened laterally, ventral surface carinate medially (Fig. 14), with ventral and dorsal apices rounded. Hypomeron concave longitudinally along pronotosternal suture (Fig. 13, white line); posterior edge carinate behind depression for reception of proleg, with three notches mesally (Fig. 15, white arrows); punctures smaller than on prosternum. Pronotosternal sutures deeply grooved and receive antennae, opened anteriorly; antennal groove becoming shallower posteriad (Fig. 13). Scutellum tongue-shaped (Fig. 4), longer than wide, flat; narrowed at anterior third; apex round; punctures small. Mesosternum with two concavities on anterior margin (Fig. 15, black arrows); concave anteriorly in lateral view (Figs 5, 11). Mesocoxal cavity closed to mesepimeron. Suture between mesosternum and metasternum present. Metasternum (Fig. 9) sulcate medially and behind mesocoxae; punctures smaller posteriad. Elytra broadly convex, without striae; with two tubercles elevated strongly (Fig. 5) (to weakly, Fig. 10, white arrows); apices rounded; punctures smaller laterad; with a longitudinal carina at each humerus (Fig. 16, white arrow). Tibiae without spurs; relative tarsomere lengths: IV<III<II<V<I; ventral lobes not developed at tarsomeres II and III, longer at tarsomere IV; tarsal claws simple.

Abdomen. Male. Tergite VIII (Fig. 23) wider than long; translucent in medina basal area; posterior margin setose. Sternite VIII (Fig. 24) emarginate, wide; poste rior notch large; translucent except with yellow band on each side; some long setae bunched together (Fig. 24, arrows). Tergite IX (Fig. 25) with posterior notch shallow; with some short setae on posterior angles. Tergite X (Fig. 25) semicircular; apical margin with fine setae. Sternite IX (Fig. 26) long; sides constricted medially. Female. Tergite VIII (Fig. 30) longer than wide, translucent in median basal area; basal margin membranous and indefinite; lateroapical margin fringed with long setae. Sternite VIII (Fig. 31) shield-shaped, longer than wide; basal margin membranous; apical margin fringed with long setae; spiculum ventrale 1.7 X length of sternite VIII (Fig. 32).

Genitalia. Male. Aedeagus (Figs 27-29) elongate. Median lobe not exceeding apices of parameres; apex slender. Parameres separated ventrally, not constricted anterior to lateral subapical barb; apex beyond lateral subapical barb 0.2 X length of paramere, with four (to six) long setae dorsally (Figs 6, 27) and one long setae and some short setae ventrally (Fig. 28); apex truncate transversal (Fig. 6: arrow) (or rounded, Fig. 29). Female. Ovipositor (Fig. 33) slender. Each coxite two-segmented ventrally (Fig. 35), with four long and two short setae at dorsal side (Fig. 34), with some thick setae (14 setae recognized in specimen examined) at ventral side (Fig. 35); apex with dense setae. Stylus setose. Colleterial gland not developed (Figs 36, 37). Bursa copulatrix (Figs 36, 37) globular, large; anteriormost part with a short accessory gland; sclerotized plate U-shaped, large and with long teeth (Figs 36, 38).

Larvae and pupae.

Unknown.

Remarks.

This species is easily identified by its three-coloured setal pattern and tubercles of the pronotum and elytra.

Bionomics.

Nothing is known about the life history.