Megachalcis vietnamensis, Narendran, T. C. & van Achterberg, Cornelis, 2016

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 : 113-116

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.