Rugichneumon tricolor, 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

Rugichneumon tricolor sp. nov.

Figs 38-43

Type material.

Holotype: (♀) China, Sichuan, Emei Shan, Jieyindian, 29.533°N, 103.331°E, 2500-3000 m elev., 03.VII.2009, leg. Blank, Liston & Taeger.

Paratype: (♂) 081 China, Sichuan, Emei Shan, Jieyindian, 29.537°N, 103.331°E, 2400-2500 m elev., 1 ♀ 06.VII.2009, leg. Blank, Liston & Taeger.

Etymology.

The species name refers to the tri-coloured metasoma.

Description.

Female. Body length 7.8 mm. Flagellum with 33 segments; 1st flagellar segment 3.1 × as long as wide; all segments longer than wide. Temple rather short, moderately and roundly narrowed behind eye. OED 1.4 × and OOD 1.4 × ocellar diameter. Face with dense larger punctures medially and rather dense finer punctures laterally, shining. Malar space 0.7 × as long as width of mandibular base. Gena with rather dense punctures ventrally. Genal carina and hypostomal carina low. Side of pronotum punctate dorsally, rugose ventrally.

Mesoscutum densely rugose-punctate, ± shining. Mesopleuron below subtegular ridge with some fine longitudinal striae. Propodeum almost continuously sloping to apex, but area dentipara only slightly elongate, its apex as far from attachment of metasoma as from anterior transverse carina; spiracle ca. 2 × as long as wide. Area superomedia heart-shaped, confluent with area petiolaris. Costula reaching area superomedia at 7/10 of its length. Area petiolaris rugose, with lateral carina. Hind coxa densely punctate, without scopa. Hind femur finely and densely punctate, 4.0 × as long as wide. External surface of hind tibia with 1-2 denticular spines. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 4 × diameter of these veins; vein 2m-cu reaching its middle. Vein 1cu-a postfurcal by 2 × its width.

Metasoma oxypygous, but hypopygium slightly elongate. Lateral field of postpetiole densely punctate. Thyridium transverse, 0.6 × as wide as interval between thyridia. 2nd tergite 1.3 × as wide as long. 2nd to 4th tergites coarsely rugose-punctate, ± dull; 2nd tergite with very coarse rugae in anterior half. Following tergites with superficial punctures, ± shining.

Colour. Black with extensive brown suffusion. Scape ochreous ventrally, flagellum dark brown; flagellar segments 9-13 ivory. Head brown; stemmaticum and occiput blackish. Side of clypeus, face, except median brown stripe, gena and complete orbits yellow. Mesosoma black; mesoscutum with four brown stripes, paramedian stripes confluent posteriorly. Pronotum dorsally, tegula, mesopleuron largely, metapleuron, except black frontal margin and propodeum, brown. Frontal and upper margins of pronotum, subteguIar ridge, scutellum and postscutellum yellow. Postpetiole with posterolateral yellow spot. 2nd to 5th tergites with wide posterior reddish bands (reddish-yellow on 3rd tergite); 6th and 7th tergites largely yellow. Legs brownish; fore coxa with apical yellow spot; hind coxa ventrally and all trochanters blackish. Wings hyaline; pterostigma brown.

Male. Body length 8.3 mm. Flagellum with 33 segments, bristle-shaped; 1st flagellar segment 3.0 × as long as wide, all segments longer than wide, not nodose. Tyloids indistinct, on flagellar segments 7-15, linear, maximally as long as their segments. OED 1.1 × and OOD 1.3 × ocellar diameter. Apical margin of clypeus slightly rounded. Malar space 0.7 × as long as width of mandibular base. Propodeal spiracle 2 × as long as wide. Area superomedia slightly wider than long. Hind femur 4.2 × as long as wide. 5th tergite rugose-punctate. Apical margin of hypopygium with moderate roundish extension medially. Structure otherwise as described for ♀. Colour as described for ♀, except: flagellum without ivory ring, postscutellum brown and mid-coxa and hind femur ± blackish ventrally; all tergites with wide reddish-yellow posterior bands (yellowish on 3rd tergite); postpetiole with posterolateral yellow spot; median yellow spots narrow on 6th tergite and wider on 7th tergite.

Figures

Figures 38 - 43. Rugichneumon bicolor sp. nov. HT: 38. Face, frontal view; 39. Head, dorsal view; 40. Propodeum, dorsal view; 41. Basal tergites of male PT, dorsal view; 42. Mesosoma, lateral view; 43. Metasoma, dorsal view.