Stilbops mandibularis Kasparyan, 1999

Watanabe, Kyohei & Maeto, Kaoru, 2012, Taxonomic study of the genus Stilbops Förster from Japan (Hymenoptera: Ichneumonidae: Stilbopinae), Zootaxa 3456, pp. 51-81 : 73-75

publication ID	https://doi.org/ 10.5281/zenodo.211080
DOI	https://doi.org/10.5281/zenodo.6178662
persistent identifier	https://treatment.plazi.org/id/8079878D-FFBF-FF8C-4DAD-6EA7FC9271FB
treatment provided by	Plazi
scientific name	Stilbops mandibularis Kasparyan, 1999
status

Treatment

Stilbops mandibularis Kasparyan, 1999 View in CoL

( Figs. 2 View FIGURE 2 G, 3 G, M, 4 G, 5 G, L, 6 G, 7 G, 8 G, 9 H, 10 G, 12 K, 13, 14 B)

Stilbops mandibularis Kasparyan, 1999: 168 View in CoL .

Diagnosis. Anterior tentorial pit large ( Fig. 2 View FIGURE 2 G), its margin concealed by dense setae; lower end of occipital carina reaching hypostomal carina ( Fig. 4 View FIGURE 4 G); ovipositor nearly straight; metasomal tergites black; tegula and trochanters yellow.

Description. Female (n=2). Body length 5.0– 5.5 mm; length of fore wing 4.5–5.0 (Original description: 4.5– 5.0) mm.

Head 0.6 times as long as wide; clypeus 0.5–0.6 times as long as wide, narrowly punctate dorsally, its margin subtruncate to truncate in anterior view ( Fig. 2 View FIGURE 2 G); anterior tentorial pit large ( Fig. 2 View FIGURE 2 G), its margin concealed by dense setae; face 0.6 times as long as wide, covered with fine punctures, its partly longitudinally coalescent, and setae on lower half denser and longer; frons covered with punctures as face, lower half of it transversely striated by coalescent punctures; OOL 2.0 times as long as OD; POL 1.6–2.0 times as long as OD; lower end of occipital carina reaching hypostomal carina at distance from mandibles 1.2 (Original description: 0.8–1.0) times as wide as base of mandible ( Fig. 4 View FIGURE 4 G); GOI 0.6–0.7; lower part of gena without concavity in lateral view ( Fig. 3 View FIGURE 3 G); malar space 0.8 times as long as basal width of mandible; mandibular base convex ( Fig. 3 View FIGURE 3 M). Antenna with 21 (Original description: 20) flagellomeres; flagellomere I 1.3 times as long as II, and terminal flagellomere 2.5 times as long as preceding one; sensilla placodea present on flagellomere III and following all flagellomeres.

Mesosoma ( Figs. 5 View FIGURE 5 G, 6 G, 7 G, 8 G): lower margin of pronotum not angulate ( Fig. 5 View FIGURE 5 G); upper end of epomia distant from upper margin of pronotum ( Fig. 5 View FIGURE 5 G); lateral area of pronotum except for smooth area on lower 0.3– 0.4 with smooth area ( Fig. 5 View FIGURE 5 G); mesoscutum with weak notaulus on anterior 0.3; smooth area around episternal scrobe rather large; upper end of epicnemial carina reaching lower 0.2–0.3 of pronotum; juxtacoxal carina partly present ( Fig. 5 View FIGURE 5 L); all carinae of propodeum present, anterior part of lateromedian longitudinal carinae coalescent directly or short transverse ridge ( Fig. 8 View FIGURE 8 G); all areas of propodeum punctate except for areas superomedia and postero smooth ( Fig. 8 View FIGURE 8 G).

Fore wing: Cu-a distant from Rs&M by 0.4–0.7 (HT: 0.4) times length of Cu-a; ICI 0.7. Hind wing: NI 3.3 (Original description: 4–5); one basal hamulus, 6 distal hamuli.

Hind femur 4.7 (Original description: about 5) times as long as deep in lateral view; hind tibia 9.3 times as long as deep in lateral view; hind tarsomere ratio I; II; III; IV; V = 3.0; 1.3–1.4; 1.0; 0.6; 0.8.

Metasoma: TI 1.2 (Original description: 1.3–1.4) times as long as maximum width, with median dorsal carina on anterior 0.3, with small median smooth spot at posterior 0.2–0.3, with weak distal depression, and lateral margin convex basally ( Fig. 10 View FIGURE 10 G); TII and TIII with pair of slight round convexities; lower half of subgenital plate covered with weak punctures. Ovipositor nearly straight; ovipositor sheath 0.5 (Original description: 0.5–0.6) times as long as hind tibia.

Coloration ( Figs. 6 View FIGURE 6 G, 7 G, 9 H, 12 K): body (excluding legs) black, except for: yellow mandible with brown apex; yellow palpi; antenna blackish-brown except for ventral half of scape, pedicel, and flagellomeres I and II yellow and ventral side and apical part of flagellum more or less brown; yellow tegula; wing veins and stigma brown; membranous area of metasomal sternites yellow; apical half of subgenital plate yellow; TII to TIV with red narrow lateral sides; ovipositor and tip of ovipositor sheath brown. Legs yellowish-brown to brown, except for: fore and mid coxae yellow apically, its base narrowly black; fore and mid tibiae and tarsi whitish-yellow; apex of hind coxa yellow; trochanters and trochantelli yellow; base and apex of hind femur yellow; hind tibia whitishyellow except for apical 0.2 blackish-brown; hind tarsus blackish-brown except for basal half of segment I yellow. Male. Additional specimens were not available. See Kasparyan (1999).

Specimens examined. (2Ƥ): [Honshu] 1Ƥ, Kanagawa Pref., Hadano city, Mt. Koubouyama, 200 m, N35°37’64" E139°15’73", 29. iv. 2007, K. Watanabe leg. (NIAES); 1Ƥ, Gifu Pref., Mizunami city, Toki town, N35°22’ E137°15’, 25. iv. 2008, T. Ban leg. (TUA).

Distribution. Japan (Honshu) and Russia (Primorskii Territory) ( Fig. 13 View FIGURE 13 ).

Remarks. This is the first record of this species from Japan. This species closely resembles vetulus in the large anterior tentorial pit concealed by setae, the convexity of base of mandible and the complete lower end of occipital carina, and can be distinguished from the latter by the absence of punctures between median dorsal carina on TI (with conspicuous punctures in vetulus ); the straight ovipositor (strongly upcurved vetulus ), the robust body (relatively slender in vetulus ) and the yellow trochanters.