Auletobius (Auletobius) siberutensis Legalov, 2019

Legalov, A. A., 2019, A new species of the genus Auletobius Desbrochers des Loges, 1869 (Coleoptera: Rhynchitidae) from Indonesia, Far Eastern Entomologist 389, pp. 1-6 : 2-4

Auletobius (Auletobius) siberutensis Legalov , sp. n.

http://zoobank.org/NomenclaturalActs/ CC4834D1-C429-481B-9809-123BCC086208

Figs 1–3

TYPE MATERIAL. Holotype – ♂, Indonesia: Mentawai Islands , Siberut Island,

Salappa vill., 50–100 m, January 2007, St. Jakl ( ISEA). Paratypes: the same label as in holotype, 75 specimens ( ISEA) .

DESCRIPTION. MALE. Body length (without rostrum) 1.6–1.9 mm. Rostrum length 0.5–0.6 mm. Body brown, covered with decumbent hair with metallic lustre.

Antennomeres 2–7 and procoxae, profemora and protibiae yellow.

Head subparallel behind eye. Mandibles externally dentate. Rostrum quite long,

almost straight, 1.3 times as long as pronotum, 5.3 times as long as wide at apex, 5.8

times as long as wide in middle, 5.0 times as long as wide at base, smooth, without carina or stria. Eyes large, stark convex, rounded. Forehead convex, finely punctate,

1.9 times as wide as rostrum base width. Temples very short. Antennae inserted at base of rostrum, reaching elytral base. Antennomeres 1 and 2 almost oval. Antennomere aedeagus, paratype, dorsal view; 3 – armament of endophallus, dorsal view. Scale bar 0.5

3

1 slightly longer than antennomere 2. Antennomere 3-5 long-conical. Antennomere 3

longer and narrower than antennomere 2. Antennomere 4 shorter than antennomere

3. Antennomere 5 subequal to antennomere 4. Antennomeres 6 and 7 oval. Antennomere 6 shorter than antennomere 5. Antennomere 7 slightly shorter and slightly wider than antennomere 6. Antennomere 8 almost rounded, shorter and wider than antennomere 7. Antennal club loose, about 0.5 times as long as antennomeres 1–8

combined. Antennomere 9 transverse. Antennomere 10 subequal to antennomere 9.

Antennomere 11 slightly shorter than antennomeres 9 and 10 combined.

Pronotum almost campaniform, 1.5 times as long as wide at apex, 1.4 times as narrow as wide in middle and 1.5 times as narrow as wide at base. Disk weakly flattened, densely punctate. Scutellum small, almost rectangular.

Elytra 1.7 times as long as wide at base, 1.3 times as long as wide in middle, 2.1

times as long as wide at apical fourth, 2.8 times as long as pronotum, densely punctate. Humeri slightly flattened. Elytral striae absent. Epipleura narrow.

Rounded apex of elytra when both together.

Pre- and postcoxal portions of prosternum short. Procoxal cavities contiguous.

Metanepisternum punctate. Metaventrite weakly convex, punctate. Abdomen convex,

punctate.

Procoxae conical. Metacoxae transverse. Trochanters small. Femora thickened,

lacking teeth. Tibiae almost straight, without costate dorsal margin and two apical spurs. Tarsi long. Tarsomere 1 long-conical. Tarsomere 2 wide-conical. Tarsomere

3 bilobed. Tarsomere 5 elongate. Tarsal claws slightly divergent, with teeth.

FEMALE. Body length (without rostrum) 1.4–1.9 mm. Rostrum length 0.5–0.6

mm. Rostrum little longer and thicker. Elytra little wider.

COMPARISION. The new species is close to A. fumigatus (Roelofs, 1874) from

East Asia but differs in the thinner and smooth rostrum, narrower pronotum, extended basally basal sclerite of the endophallus, and smaller body sizes. It is similar to A.

acaciae Voss, 1935 from Java, but is distinguished in the longer (considerably longer than head) narrow rostrum, narrow pronotum, wider elytra and narrowed to the apex basal sclerite of the endophallus. From A. sumatranensis Legalov, 2007

from Sumatra, it is differs in the dark body with yellow procoxae, profemora and protibiae, a rather narrow pronotum, sparse punctate forehead and body covered with sparse hairs.

DISTRIBUTION. Indonesia: Siberut Island ( Fig. 4 ).

ETYMOLOGY. From name of the island Siberut.

Figures

Figs. 1–3. Auletobius siberutensis, sp. n., male. 1 – holotype, habitus, dorsal view; 2 –

Fig. 4. Distribution of species of the genus Auletobius from Sunda Islands. star – A.