Coelichneumon (Coelichneumon) tonkinensis, Riedel, 2013

Riedel, M., 2013, Contribution to the Ichneumoninae (Hymenoptera, Ichneumonidae) of Southeastern Asia: 2. Tribe Heresiarchini, Linzer biologische Beiträge 45 (2), pp. 2025-2076 : 2044

Coelichneumon (Coelichneumon) tonkinensis nov.sp.

Holotypus (): "NW Vietnam: Tonkin, Hoang Lien N.R. 10 km SW Sa Pa, c. 1900 m, 15- 21.X.1999 and 15-21.X.1999, Malaise traps, C. v. Achterberg, RMNH`99" (Leiden).

P a r a t y p u s (): "NW Vietnam: Tonkin, Hoang Lien N.R. 10 km SW Sa Pa, c. 1900 m, 15-21.X.1999 and 15-21.X.1999, Malaise traps, C. v. Achterberg, RMNH`99" (Leiden).

D e s c r i p t i o n of: Body length 17 mm. Flagellum with 37-38 flagellomeres, first flagellomere (without anellus)1.8x as long as wide, long-oval tyloids on flagellomeres 6-18. Temple strongly, almost linearly narrowed behind the eye. Distance of lateral ocellus to the eye 1.2x as long as its diameter. Frons, face, and clypeus with scattered puncture, shining. Hypostomal carina not elevated.

Mesosoma with whitish hairs. Mesoscutum with rather dense puncture and fine granulation, shining; mesopleurum and metapleurum with scattered puncture, strongly shining, coxal carina strong. Scutellum almost flat, about as long as wide, without lateral carina. Propodeum rounded, area superomedia in the holotype heart-shaped, about as long as wide, smoothened centrally, costula behind the middle, in the paratype smooth and elevated above other areae (as in Aglaojoppa ). Area superoexterna punctured, area petiolaris with lateral carina, rugulose. Femur III about 4.0x as long as high. Metatarsus I without apical tooth.

Areolet quadrangular, intercubiti meeting frontally. Nervulus postfurcal.

Postpetiolus moderately widened. Lateral field about 0.75x as wide as median field, punctured, median field with fine striation. Gastrocoelus strongly impressed, with longitudinal ridges. Thyridium oblique, about 0.8x as wide as the thyridial interval. Tergite 2 as long as wide. Tergites 2-3 densely punctured, strongly striate medially. Tergites 4-5 with superficial puncture.

Colour: Body with strong bluish shine, metasoma more metallic violet. Flagellum, tibiae and tarsi black. Ivory are stripe on flagllomeres 10-12 (holotype) or 12 only (paratype), clypeal sides, facial and frontal orbits, outer orbit below and spot on vertex, collare and upper margin of pronotum, spot on tegula, mark on lower mesopleurum, subtegular ridge, scutellum completely, apical half of area dentipara, hind margin of postpetiolus and posterolateral spots on tergites 2-4, frontal spots on coxae I-II, anterodorsal spot on coxa III, frontal stripes on the apical half of femora I-II, on tibiae I-II and basal half of metatarsus I. Wings brownish, pterostigma black.

unknown.

R e m a r k: In the key of HEINRICH (1966 a)this new taxon runs to Coelichneumon albonotatus (CAMERON) but differs by the completely ivory scutellum, ivory marks on mesopleurum and on area dentipara, ivory spots on all coxae, and the darkened wings. From Coelichneumon cyaniventrops HEINRICH ,it can be distinguished by the bluish colour of head and mesosoma. However, it is not impossible that the new species represents the unknown of C. cyaniventrops .

The available show remarkable differences in the structure of area superomedia. In the holotype, the form is typical for Coelichneumon , but in the paratype the elevated and smooth area superomedia is sculptured as in the genus Aglaojoppa . A similar variation has been found in the European species Coelichneumon bohemani (HOLMGREN) ( RIEDEL 2012) . Hence, the intermediate forms found in both genera, even in one species, would be a strong argument to synonymize these genera.

D i s t r i b u t i o n: Vietnam.