Dirhinus claviger Boucek & Narendran, 1981

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 : 70-71

Taxon classification Animalia Hymenoptera Chalcididae

Dirhinus claviger Boucek & Narendran, 1981 Figs 79-80, 81-82

Dirhinus claviger Bouček & Narendran, 1981: 237 (♀, holotype, India (BMNH)); Narendran 1989: 290, 293 (keyed)).

Dirhinus clavatus Hussain & Agarwal, 1981: 185 (♀, holotype, Aligarh (ZDAMU) (synonymised with Dirhinus claviger Bouček & Narendran by Narendran 1989)).

Material.

2 ♀ (RMNH, IEBR), "Vietnam: Ninh Thuân, Núi Chúa N. P., dry South part, 22-29.v.2007, C. v. Achterberg & R. de Vries, RMNH’07”.

Diagnosis.

This is a unique species with the following combination of characteristics: clavate antenna, an extra outer carina near hind tibial sulcus, very reduced pilosity and striate area of T1 0.40-0.45 × length of T1.

Description

(female from Vietnam). ♀, length of body 3.7 mm.

Colour. Black with following parts as follows: scape pale yellowish brown; pedicel and funicular segments pale yellowish brown with a black tinge; clava dark brown; eyes gray with pale reflecting yellowish spots; ocelli reflecting pale whitish yellow; fore and mid legs (except black coxae) pale brownish yellow; hind leg black except pale yellow tarsi; telotarsi brown; wings hyaline, veins brown.

Head. In dorsal view sides of head moderately converging behind eyes; eyes longer than temples (9:5); ocellar area distinctly elevated; POL a little shorter than OOL (7:8); AOL twice OOL; each horn with a notch present outside of apex; each horn in basal third 1.5 × as broad as scrobal gap, latter 0.7 × breadth of pre-claval segment of antenna; pre-orbital carina present; facial edge of scrobes weakly sinuate in lateral view; antenna short, strongly clavate, clava slightly longer than broad (8:7), with a large area of micro-pilosity on one side; all flagellar segments transverse, pre-claval segment nearly 3 × as broad as long; pedicel as long as flagellar segments 2 and 3.

Mesosoma. Mesosoma hardly depressed; its pits dense but not crowded, leaving broad smooth areas on scapulae and on median part of scutellum; middle lobe of mesoscutum with pits close to anterior admarginal area without punctures, smooth, interstices smooth and carinate. Pronotum in median line very slightly depressed, sides hardly converging forward; scutellum slightly broader than long (11:9), apex curved and rounded. Propodeum with hind corners 1.3 × nearer to each other than to metanotal margin; median areola nearly round, slightly longer than broad. Adcoxal lateral tooth of metapleuron a little less than 90°.

Wings. Fore wing 3.4 × as long as broad, pilosity mostly reduced, a little more numerous near apical margin; PMV subequal in length to STV.

Legs. Hind femur 1.3 × as long as broad, with interstices of setigerous pits shorter to a little longer than width of 3rd hind tarsal segment; basal tooth of comb slightly more prominent than other teeth. Hind tibia with well developed external carina, extending over half length towards knee, furrow between this carina and tarsal sulcus flat.

Metasoma. Metasoma as long as mesosoma; petiole twice as broad as its length, with 2 pairs of strong raised longitudinal carinae enclosing foveola; anterior margin strongly emarginated in middle; striate area of T1 with 14-16 strong longitudinal striae, their length 0.4 × length of T1, hind margin of striate area almost straight; hind half of T1 shiny, mostly smooth, but with a cross row of microscopic pits before apex, pits faint in middle part of cross row but a little more dense on sides.

Male. So far not recorded from Vietnam.

Host.

Unknown.

Distribution.

Vietnam (new record), India, Sri Lanka, ( Bouček and Narendran 1981; Narendran 1989).

Variation.

Length of body 3.5-3.7 mm. Each frontal horn in basal third 1.5-1.7 × as broad as scrobal gap; propodeum with hind corners about 1.2-1.3 × nearer to each other than to metanotal margin; petiole 1.7-2.0 × as long as broad; striate area of T1 almost straight to slightly arcuate at apex; length of striate area of T1 0.40-0.45 × length of T1.