Mesoleptidea ruficoxalis Li & Sun, 2024

Li, Tao, Li, Bin & Sun, Shu-Ping, 2024, Three new species of Mesoleptidea Viereck (Hymenoptera, Ichneumonidae) from China, Zootaxa 5397 (2), pp. 251-263 : 259-262

Mesoleptidea ruficoxalis Li & Sun , sp. nov

Figures 28–41

Material examined. Holotype, Female, CHINA: National Forest Park of Mt Wawu, Hongya , Sichuan Province, N 29°40´, E 102°59´; 1180 m, 13 June 2019, IT by Gui-Ru Kang, CBDPC . Paratypes: 1 female, Ernianping, Mt Laojun, Yibin , Sichuan Province, N 28°42´, E 104°26´, 1504 m; 1 June 2019, IT by Wen-Cai Chen, CBDPC . 1 male, same data as holotype except 6 June 2021 .

Diagnosis. Apical margin of clypeus truncate ( Fig. 29 ). Lower tooth of mandible almost as long as upper tooth ( Fig. 29 ). Postocellar line 0.7 × as long as ocular-ocellar line. Tergite 3 1.2 × as long as posterior width. Ovipositor sheath parallel, not narrowed posteriorly ( Fig. 41 ). Mesoscutum and scutellum predominantly darkish red brown. Mesostenum, hind coxa and femur red brown. Mesoscutum entirely darkish brown. Lower portion of mesopleuron whitish yellow ( Fig. 32 ).

Description. Female ( Fig. 28 ). Body length about 10.8 mm. Fore wing about 9.3 mm. Ovipositor sheath about 0.4 mm.

Head. Face approximately 1.7 × as wide as long, shining with fine granular and dense setae, lower margin slightly concave ( Fig. 29 ). Clypeus 2.8 × as wide as long, convex from basal to median portions, shining with long sparse setae; apical margin truncate ( Fig. 29 ). Mandible large and long, with dense setae basally; lower tooth as long as upper tooth ( Fig. 29 ). Malar space about 0.4 × as long as basal width of mandible ( Fig. 31 ). Gena evenly convergent backward, with fine granular microsculpture and dense setae ( Fig. 31 ). Vertex with the same texture as gena, slight concave after antennal socket ( Fig. 30 ). Postocellar line approximately 0.7 × as long as ocular-ocellar line. Frons slightly flat, with same texture as vertex. Antenna with 38 flagellomeres; ratio of length from first to fifth flagellomeres: 2.3:1.3:1.2:1.1:1.0. Occipital carina complete, genal carina joining hypostomal carina above base of mandible.

Mesosoma. Pronotum shiny, dorsal half of concavity with oblique wrinkles and ventral half with fine reticulate wrinkles; dorsal margin with evenly dense setae ( Fig. 32 ). Epomia absent. Mesoscutum convex, shiny, with evenly dense setae ( Fig. 33 ). Notaulus distinct on anterior half portion of mesoscutum. Scuto-scutellar groove deep, shiny. Scutellum distinctly convex, shiny, with dense setae ( Fig. 33 ). Mesopleuron almost flat, almost shiny, lower portion with dense setae ( Fig. 32 ). Speculum shiny. Dorsal end of epicnemial carina closing anterior margin of mesopleuron, not reaching to subtegular ridge. Metapleuron slightly convex, shiny, with dense granular and setae; submetapleural carina complete. Wings hyaline ( Fig. 34 ). Fore wing with vein 1cu-a distal to M&RS by 0.1 × length of 1cu-a. Areolet forming an oblique triangle, with short petiole, receiving vein 2m-cu almost at its lower-posterior corner ( Fig. 35 ). Postnervulus intercepted at lower 0.4. Hind wing vein 1-cu 1.5 × as long as cu-a. Ratio of length of hind tarsomeres from first to fifth: 3.7:2.0:1.5:1.0:1.1 ( Fig. 36 ). Propodeum convex, shagreened, with dense long setae; basal median portion deeply semicircle concave; apical half of lateromedian longitudinal carinae relatively weak; apico-median portion shiny, with weak longitudinal wrinkles. Propodeal spiracle small, circular, located at basal 0.2 of propodeum ( Fig. 37 ).

Metasoma. Tergite 1 approximately 6.6 × as long as anterior width, 3.3 × as long as posterior width ( Fig. 38 ); shagreened, with dense setae; latero-median carinae absent; dorso-lateral carinae interrupted after spiracle ( Fig. 39 ); ventro-lateral carinae complete; spiracle circular, located at middle of tergite. Tergite 2 approximately 1.8 × as long as anterior width, 1.2 × as long as posterior width ( Fig. 40 ); shiny, with evenly dense setae; thyridium almost circular, concave. Tergite 3 approximately 1.2 × as long as posterior width, shiny, with dense setae; thyridium oblique elongate. Ovipositor sheath 4.9 × as long as its width ( Fig. 41 ). Ovipositor strong, compressed, with subapical dorsal notch.

Coloration ( Fig. 28 ). Black, except the following: face except median spot dark brown, clypeus, mandible except teeth dark reddish brown, malar space, lower portion of gena, maxillary and labial palpi, antenna except dorsal of scape and pedicel and basal half of flagellum dark brown to black brown, upper-posterior corners of pronotum, tegulae, antero-lateral portion of mesoscutum, fore and mid legs except coxa and trochanters yellowish white, yellowish brown. Mesoscutum, median of scutellum, lower half of mesopleuron (with whitish yellow), hind leg except apical margin of femur and dorsal portion of tibia darkish brown and ventral portion of tibia and tarsus brown, reddish brown. Wings slightly infuscate. Pterostigma except median portion yellowish brown and veins dark brown. Ovipositor sheath dark brown. Body with yellowish brown setae.

Male. Body length about 11.2 mm. Fore wing about 9.1 mm.

Antenna with 39 flagellomeres. Basal portion of lateromedian longitudinal carinae absent. Black, except for following: face except median spot dark brown, clypeus, mandible except teeth dark reddish brown, malar space, lower portion of gena, maxillary and labial palpi, antenna ventral of scape and pedicel and first flagellomere, lower of propleuron, upper-posterior corners of pronotum, tegulae, subtegular ridge, lower half of mesopleuron (with median slight reddish brown) yellow. Fore and mid legs except coxa and trochanters yellowish white, yellowish brown. Mesosternum, hind leg (dorsal coxa with longitudinal band black brown, ventro-apical margin yellowish white; dorsal of trochanter dark brown; trochantellus yellowish white; most median of femur, dorsal and apical half of tibia dark brown; ventral-basal of tibia brown; tarsus dark brown) reddish brown. Lateral of tergites 2–4, sternites 2–6 except lateral longitudinal bands dark brown, median of sternite 7 yellowish white. Lateral of tergites 5–6 yellow. Remainder almost entirely same as female.

Distribution. CHINA: Sichuan ( Fig. 42 ).

Etymology. The specific name is derived from the hind coxa being brown.

Differential diagnosis. The new species is similar to M. cingulatus (Gravenhorst, 1829) in having the apical margin of clypeus truncate; fore wing with areolet, and tergites black. Mesoleptidea cingulatus has the apical margin of clypeus arched; fore wing without areolet; posterior portion of tergites with yellowish white transverse band.

Figures

FIGURE 42. Distribution map of Mesoleptidea species of China (map from: http://bzdt.ch.mnr.gov.cn).

FIGURES 28–30. Mesoleptidea ruficoxalis Li & Sun, sp. nov., ♀, holotype (CBDPC). 28 Habitus, lateral view. 29 Head, anterior view. 30 Head, dorsal view. Scale bars: 28 = 2.0 mm; 29–30 = 0.3 mm.

FIGURES 31–36. Mesoleptidea ruficoxalis Li & Sun, sp. nov., ♀, holotype (CBDPC). 31 Head, lateral view. 32 Mesosoma, lateral view. 33 Mesoscutum and scutellum, dorsal view. 34 Wings. 35 Areolet. 36 Hind tarsus. Scale bars: 31–33 = 0.3 mm; 34 = 1.0 mm; 35 = 0.2 mm; 36 = 0.5 mm.

FIGURES 37–41. Mesoleptidea ruficoxalis Li & Sun, sp. nov., ♀, holotype (CBDPC). 37 Propodeum. 38 Tergite 1, dorsal view. 39 Tergite 1, lateral view. 40 Tergite 2, dorsal view. 41 Apical portion of metasoma, lateral view. Scale bars: 37–40 = 0.3 mm; 41 = 0.2 mm.