Trigonura luzonensis Narendran, 1987

Narendran, T. C. & van Achterberg, Cornelis, 2016, Revision of the family Chalcididae (Hymenoptera, Chalcidoidea) from Vietnam, with the description of 13 new species, ZooKeys 576, pp. 1-202 : 140-142

Taxon classification Animalia Hymenoptera Chalcididae

Trigonura luzonensis Narendran, 1987 Figs 200, 201

Trigonura luzonensis Narendran, 1987a: 288 (♀, Luzon, Philippines (USNM)), 1989: 216.

Material.

1 ♀ (RMNH), "S. Vietnam: Dóng Nai, Cát Tiên N. P., c. 100 m, 1-9.x.2005, Ficus trail, Malaise traps 1-8, C. v. Achterberg & R. de Vries, RMNH’ 05.

Diagnosis.

This species resembles Trigonura indica Narendran in having the metasoma acuminate and oval and scutellum highly vaulted. However, Trigonura luzonensis differs from Trigonura indica in many features. In Trigonura luzonensis the outer disc of hind femur is densely and minutely punctate and blackish, without any yellow spot, whereas in Trigonura indica the punctures are less close on the hind femur and it is yellowish-red with a distinct characteristic yellow spot at the apex. The hind tibia is reddish-brown with its base black in Trigonura indica , whereas in Trigonura luzonensis the hind tibia is completely black. In addition, the punctation on T6 differs in both species.

Description.

♀, length of body 6.2-7.0 mm.

Colour. Head black; eye and ocellus reflecting pale yellow; mandible rusty red except its black tips; mesosoma dorsally rusty-red and laterally and ventrally black; legs black with following parts rusty-red: tip of fore femur, base and tip of fore tibia, base and tip of mid tibia, hind coxa and all tarsi; fore wing slightly smoky.

Head. Head with large close, umbilicate pits, interstices shorter than half diameter of a pit, rugose, almost carinate in most areas; POL 2.5-3.1 × OOL; interantennal projection in Vietnamese specimen reach just below anterior ocellus as a continuation of a carina from distal part of inter-antennal projection.

Mesosoma. Pronotum with deep, close pits, interstices rugose-carinate; anterior margin of pronotum carinate laterally, posterior margin concave in middle; mesoscutum highly convex and vaulted with interstices between pits projecting as humps; scutellum highly convex and similarly sculptured.

Wings. Fore wing with PMV slightly longer than STV, 0.3 × as long as MV.

Legs. Hind coxa densely punctate and pubescent on ventral side; hind femur with close minute setigerous pits, outer ventral margin with a row of irregular teeth, basal tooth much larger than others.

Metasoma. Metasoma with a small T1 (shorter than its width); metasoma a little longer than mesosoma.

Male. Similar to ♀ except for stouter antenna and shorter metasoma.

Host.

Unknown.

Distribution.

Philippines, India, Vietnam (new record).

Variation.

The Vietnamese specimen has the dorsal part and distal ventral half of the hind coxa black and remaining baso-ventral part rusty red (Fig. 200).