Exephanes rufocapitis, Riedel, 2023

Riedel, Matthias, 2023, Notes on Ichneumoninae (Hymenoptera, Ichneumonidae) from southern China, with descriptions of one new genus and twelve new species, Contributions to Entomology 73 (2), pp. 223-248 : 223

Exephanes rufocapitis sp. nov.

Figs 5 , 17-21

Type material.

Holotype. (♀) China, Yunnan, Gongshan, 40 km SW: Dulong, 27.984°N, 98.324°E, 1700 m elev., 08.VI.2009, leg. Blank, Liston, Taeger.

Etymology.

The species name refers to the rufous colour of the head.

Description.

Female. Body length 11 mm. Flagellum with 38 segments, stout and almost filiform; 1st flagellar segment 1.8 × as long as wide, about 9th segment square; widest segments and pre-apical segment 1.4 × as wide as long. Temple moderately and roundly narrowed behind eye, coarsely rugose-punctate. OED 1.8 × and OOD 1.6 × ocellar diameter. Frons coarsely rugose-punctate, dull. Face with dense punctures, partly with transverse rugae. Clypeus almost flat, with sparse punctures; apical margin sharp and straight. Mandible with blunt teeth, ventral tooth very small. Gena with rather dense punctures ventrally. Malar space 1.1 × as long as width of the mandibular base. Genal carina reaching hypostomal carina far from mandibular base; both carinae low.

Notaulus shortly impressed at anterior margin of mesoscutum. Mesoscutum densely punctate, ± shining. Mesopleuron coarsely punctate and striate; speculum with fine punctures. Epicnemial carina low. Metapleuron coarsely punctate and striate; juxtacoxal carina present. Scutellum almost flat, about as long as wide, punctate, without lateral carina. Propodeum rugose, spiracle slit-shaped. Area basalis trapezoid, ca. 2 × as wide as long. Area superomedia rectangular, 1.5 × as long as wide. Costula absent. Area petiolaris with lateral carina and transverse rugae. Hind coxa densely punctate, without scopa. Hind femur 4.0 × as long as wide, with sparse punctures basally and in ventral half. Tarsi slender. Tarsal claws simple. Areolet pentagonal; frontal distance between veins 2rs-m and 3rs-m 5 × diameter of these veins; vein 2m-cu slightly distal to its middle. Vein 1cu-a strongly postfurcal by 4 × its width.

Metasoma oxypygous, slightly compressed in posterior third. Only 2nd and 3rd sternites with median folds. Postpetiole distinctly widened, without latero-median carina; median field finely aciculate, lateral carina aciculate and finely punctate. Gastrocoelus impressed, with longitudinal ridges. Thyridium slightly oblique, 0.7 × as wide as interval between thyridia. 2nd tergite 1.2 × as wide as long. 2nd tergite finely rugose-punctate, dull. 3rd tergite finely punctate, ± shining. 7th tergite slightly longer than 6th tergite, 8th tergite visible dorsally. Ovipositor sheath slightly extending behind metasomal apex, rather slender; cerci reaching beyond basal half.

Colour. Black. Head reddish; occiput in part and area around antennal scrobes blackish. Scape and flagellar segments 1-9 reddish; segments 10-14 ivory, distal segments black. Mesosoma black; collar and wide upper margin of pronotum, mesoscutum, subtegular ridge, postscutellum and diffuse spots on area externa of propodeum reddish. Scutellum yellow with reddish margins. 1st to 3rd tergites red, following tergites black; 5th sternite with small median ivory spot, 6th to 8th tergites with ivory median stripes. Legs red; hind coxa ventrally and stripes of all trochanters black. Wings with yellowish suffusion; pterostigma reddish-yellow.

Male. Unknown.

Remark.

This new species represents the only known Oriental member of the Holarctic genus Exephanes Wesmael which has a characteristic structure of the metasomal apex with the elongate 7th tergite and visible 8th tergite and elongate cerci. The new species differs from the known Palaearctic species of Exephanes by its red head, partly red mesosoma and tricoloured flagellum.

Figures

Figures 4 - 5. Habitus, lateral view: 4. Aoplus rufomesonotator HT; 5. Exephanes rufocapitis HT.

Figures 17 - 21. Exephanes rufocapitis sp. nov. HT: 17. Face, frontal view; 18. Head, dorsal view; 19. Propodeum, dorsal view; 20. Basal tergites, dorsal view; 21. Metasomal apex (4 th to 8 th tergites, lateral view.