Taxon classification Animalia Hymenoptera Chalcididae

Megachalcis vietnamensis sp. n. Figs 165-167, 168

Type material.

Holotype (RMNH), ♀, "S. Vietnam: Dóng Nai, Cát Tiên N. P., Ficus trail, Mal. traps, c 100 m, 9-30.iv.2007, M.P. Quy & N.T. Manh, RMNH’07” .

Diagnosis.

In the key to Oriental species of Megachalcis (Narendran 1989) this species comes near Megachalcis malabarica Narendran in having an inner basal tooth at the hind femur. However, the new species differs from Megachalcis malabarica in having: 1) distance between apex of epipygium to tip of ovipositor sheath (in dorsal view) longer than metasoma (56:44) (in Megachalcis malabarica distance between apex of epipygium to tip of ovipositor sheath shorter than metasoma); 2) pronotum with two submedian humps (in Megachalcis malabarica pronotum without humps); 3) hind coxa with a dorsal tooth (in Megachalcis malabarica hind coxa without a dorsal tooth), and 4) between apex of scrobe and anterior ocellus without a triangular pubescent area (in Megachalcis malabrica with a triangular pubescent area between anterior ocellus and apex of scrobe).

Description.

Holotype, ♀, length of body 14.5 mm (including 5.1 mm length of ovipositor sheath).

Colour. Black with following parts as follows: eyes grayish yellow; tarsi liver brown; mid coxa with a reddish brown tint on some parts; mid tibia basally and apically slightly yellowish brown; hind tibia reddish brown with margins black; apical margin of T1 and sternites pale brown; wings hyaline with a little golden brown tinge; veins dark brown; pubescence silvery.

Head . Head densely pubescent; width in anterior view 1.4 × its height; width in dorsal view 2.4 × its length; POL 1.6 × OOL; AOL equal to OOL; LOL equal to AOL; width between eyes in dorsal view 3 × POL; occiput concave; head completely pitted with large close pits, interstices carinate; scrobe reaching anterior ocellus; MS carinate; malar space 0.4 × eye height in profile; eye length 0.7 × eye height in profile; gena densely pubescent; eyes bare; pre-orbital carina absent; post-orbital carina starting from MS running upwards, not reaching geno-temporal margin; antenna inserted at level of ventral margin of eyes; scape not reaching anterior ocellus. Relative L:W of antennal segments:scape 18:4; pedicel = 4:3; anellus = 1:3; F1 to F6 equal length and width (5:4); F7 = 4:4; clava = 8:4; scape densely setose ventrally.

Mesosoma. Pronotum with close, deep pits; interstices carinate, two distinct humps present submedially on posterior marginal area; posterior margin of pronotum a little emarginated medially; mesoscutum and scutellum closely pitted, interstices carinate; apex of scutellum straight or entire. Propodeum with large foveolae, plicae raised, carinate; spiracle bean-shaped; a distinct tooth on either side projecting to lateral side; propodeum with dense silvery large setae on either side, spread over to median part.

Wings. Fore wing 3.3 × as long as wide; relative length of CC = 24; SMV = 21; MV = 7; PMV = 14; STV = 3.

Legs. Hind coxa with a dorso-basal tooth; hind femur twice as long as broad, ventral margin with a row of 11 teeth of different size; inner side of hind femur with a ventro-basal tooth; hind tibia with a deep smooth lengthy fovea from middle to apex on inner side.

Metasoma. Metasoma (excluding ovipositor sheath) distinctly longer than mesosoma (44:31); ovipositor sheath distinctly longer than metasoma (56:44).

Male. Unknown.

Host.

Unknown.

Distribution.

Vietnam.