Stilbops coeloclypeus, Watanabe, Kyohei & Maeto, Kaoru, 2012

Watanabe, Kyohei & Maeto, Kaoru, 2012, Taxonomic study of the genus Stilbops Förster from Japan (Hymenoptera: Ichneumonidae: Stilbopinae), Zootaxa 3456, pp. 51-81 : 59-63

publication ID	https://doi.org/ 10.5281/zenodo.211080
DOI	https://doi.org/10.5281/zenodo.6178652
persistent identifier	https://treatment.plazi.org/id/8079878D-FFA1-FF98-4DAD-6CD7FDBB762E
treatment provided by	Plazi
scientific name	Stilbops coeloclypeus
status	sp. nov.

Treatment

Stilbops coeloclypeus sp. nov.

( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 C, L, 3 C, K, 4 C, 5C, 6 C, 7 C, 8 C, 9 C, 10 C, 11 C, D, 12 D, E, 13, 14 B)

Diagnosis. Clypeal margin concave medially in anterior view ( Fig. 2 View FIGURE 2 C); anterior tentorial pit relatively large ( Fig. 2 View FIGURE 2 C), its margin concealed by dense setae; lower part of gena without concavity in lateral view ( Fig. 3 View FIGURE 3 C); malar space short, 0.7–0.8 (male: 0.5–0.6) times as long as basal width of mandible; TII and TIII with pair of weak round convexities; metasoma and hind femur black (a few females with hind femur tinged brown); hind tibia partly yellow; and tegula yellow.

Description. Female (n=40). Body length 5.8–6.8 (HT: 6.3) mm; length of fore wing 5.0–5.9 (HT: 5.5) mm.

Head 0.6 times as long as wide; clypeus 0.5 times as long as wide, entirely smooth except for upper part punctate, its margin concave medially in anterior view ( Fig. 2 View FIGURE 2 C); anterior tentorial pit relatively large ( Fig. 2 View FIGURE 2 C), its margin concealed by dense setae; face 0.6–0.7 times as long as wide, covered with fine punctures, punctures below antennal socket partly longitudinally striated and denser than other area, and setae on lower half denser and longer; frons covered with punctures denser and larger than on face ( Fig. 2 View FIGURE 2 K); OOL 1.6–1.8 (HT: 1.6) times as long as OD; POL 1.4–1.6 (HT: 1.4) times as long as OD; lower end of occipital carina effaced ( Fig. 4 View FIGURE 4 C); GOI 0.6; lower part of gena without concavity in lateral view ( Fig. 3 View FIGURE 3 C); malar space 0.7–0.8 (HT: 0.7) times as long as basal width of mandible; mandibular base flat ( Fig. 3 View FIGURE 3 K). Antenna with 21–22 (HT: 21) flagellomeres; flagellomere I 1.3 times as long as II, and terminal flagellomere 2.7–2.8 (HT: 2.7) times as long as preceding one; sensilla placodea present on flagellomere II or apical 0.7 of flagellomere I (in a few specimens) and following all flagellomeres.

Mesosoma ( Figs. 5 View FIGURE 5 C, 6 C, 7 C, 8 C): lower margin of pronotum not angulate ( Fig. 5 View FIGURE 5 C); upper end of epomia distant from upper margin of pronotum in lateral view ( Fig. 5 View FIGURE 5 C); lateral area of pronotum punctate except for lower half with smooth area ( Fig. 5 View FIGURE 5 C); mesoscutum with weak notaulus on anterior 0.3; smooth area around episternal scrobe large; upper end of epicnemial carina reaching lower 0.2–0.3 of pronotum; juxtacoxal carina absent; all carinae of propodeum present, anterior part of lateromedian longitudinal carinae coalescens ( Fig. 8 View FIGURE 8 C); all areas of propodeum punctate except for area superomedia and area postero smooth ( Fig. 8 View FIGURE 8 C).

Fore wing ( Fig. 1 View FIGURE 1 ): Cu–a distant from Rs&M by 0.5–0.8 (HT: 0.6) times length of Cu-a; ICI 0.6–0.7 (HT: 0.7). Hind wing: NI 4.0–10.0 (HT: 5.0); one basal hamulus, 5 or 6 (HT: 5) distal hamuli.

Hind femur 5.0–5.2 (HT: 5.2) times as long as deep in lateral view; hind tibia 8.7–10.0 (HT: 8.7) times as long as deep in lateral view; hind tarsomere ratio I; II; III; IV; V = 3.0; 1.25–1.4 (HT. 1.4); 1.0; 0.6–0.7 (HT: 0.7); 0.8– 0.9 (HT: 0.8).

Metasoma: TI 1.3–1.4 (HT: 1.3) times as long as maximum width, with distinct median dorsal carina on anterior 0.2–0.3, with distal depression, and lateral margin weakly convex basally; TII and TIII with pair of weak round convexities; subgenital plate weakly punctate. Ovipositor straight; ovipositor sheath 0.5–0.6 (HT: 0.5) times as long as hind tibia.

Coloration ( Figs. 6 View FIGURE 6 C, 7 C, 9 C, 12 D): body (excluding legs) black, except for: yellow mandible except for teeth; antenna with ventral parts of scape and pedicel yellow; yellow palpi; yellow tegula; stigma with yellow basal area, remainder dark brown; wing veins dark-brown except for yellow of extreme wing base; sternites yellow in membranous part and posterior margin of subgenital plate, remainder brown to black; thyridium reddish-brown; ovipositor yellowish-brown to brown. Legs yellowish-brown to brown, except for: fore and mid coxae (except for brown base), trochanters and trochantelli yellow; black hind coxa with yellow apex; hind trochanter and trochantellus yellow; hind femur except for base and apex black; hind tibia brown to black extreme apex and ventral side, remainder yellowish-brown; dark brown to black hind tarsus with yellowish-brown base of segment I. Clypeus and hind femur sometimes tinged reddish-brown.

Male (n= 103). Similar to female: body length 5.3–7.2 mm; length of fore wing 4.5–5.6 mm. Punctures on frons weakly transversely striated in median part; OOL 1.0–1.4 times as long as OD; POL 1.0–1.6 times as long as OD; occipital carina complete dorsally; malar space 0.5–0.6 times as long as basal width of mandible. Antenna with 26–29 flagellomeres; flagellomere I 1.2–1.4 times as long as II and terminal flagellomere 1.2–2.2 times as long as preceding one; sensilla placodea present on flagellomere I and following all flagellomeres. Fore wing: Cu- a distant from Rs&M by 0.3–0.7 times as long as Cu-a; ICI 0.6–0.8. Hind wing: NI 3.0–10.0; one basal hamulus, 5 or 6 distal hamuli. Hind femur 5.0–5.6 times as long as deep in lateral view; hind tibia 8.6–10.0 times as long as deep in lateral view; hind tarsomere ratio I; II; III; IV; V = 3.0; 1.3–1.5; 1.0–1.2; 0.7–0.8; 0.9. TI 1.6–1.8 times as long as maximum width, median dorsal carina on anterior 0.4; round convexities on TII and TIII weaker; inner margin of paramere concave medially and weakly produced inward apically in ventral view ( Fig. 11 View FIGURE 11 C).

Coloration similar to female ( Fig. 12 View FIGURE 12 E): yellow area of hind tibia sometimes expanded.

Type series. Holotype: female [Honshu] Tochigi Pref., Nasushiobara city, Shiobara, Utou-sawa, 700 m, 22–28. v. 2008, T. Matsumura leg., Malaise trap ( NIAES). Paratypes (39Ƥ 10333): [Hokkaido] 13, Sapporo city, Mt. Teine, 13. vi. 1996, G. Ito leg. ( NIAES). [Honshu] 1Ƥ, Aomori Pref., Aomori city, Yokouchi-Yaegiku, 6. vi. 1992, T. Ichita leg. ( NIAES); 1Ƥ, Aomori Pref., Aomori city, Kayano-chaya, 13–27. vi. 1992, T. Ichita leg., Yellow sticky trap ( NIAES); 333, Iwate Pref., Mt. Hayachine, 1000m alt., 20. v. –21. vi. 1989, H. Makihara & M. Sharkey leg., Malaise trap ( AEI); 1Ƥ, Niigata Pref., Kurokawa vil., Tainai, 3–4. vi. 1980, H. Takemoto leg. ( NIAES); 1Ƥ, same data as holotype ( NIAES); 13, Ibaragi Pref., Tsukuba city, NIAES, 14–19. iv. 1989, M. Sharkey leg. ( AEI); 1333, Ibaragi Pref., Mt. Tsukuba, iv–v. 1989, M. Sharkey leg. ( AEI); 833, same locality and collector, 1–20. v. 1989 ( AEI); 1Ƥ, Tokyo Pref., Mt. Takao, 24. iv. 1963, J. Minamikawa leg. ( NIAES); 1333, same locality and collector, 29. iv. 1969 ( NIAES); 1Ƥ, Kanagawa Pref., Yokohama, 3. v. 1934, K. Sato leg. ( AEI); 13, Kanagawa Pref., Sugita, 22. v. 1934, K. Sato leg. ( AEI); 233, Kanagawa Pref., Kamakura city, Kamakura, 4. iv. 1953, H. Nagase leg. (TUA); 13, same locality and collector, 3. v. 1984 (TUA); 13, Kanagawa Pref., Zushi city, Jinmu-ji, 21, iv. 1995, H. Nagase leg. (TUA); 1Ƥ, Kanagawa Pref., Fujisawa city, Shinbayashi-koen, 10 m, N35°19’44" E139°29’33", 20. iv. 2008, T. Ishizaki leg. (TUA); 13, Kanagawa Pref., Kawasaki city, Miyazakidai, 7. iv. 2001, T. Ishizaki leg. (TUA); 1Ƥ, Kanagawa Pref., Hadano city, Mt. Koubouyama, 200 m, N35°37’64" E139°15’73", 29. iv. 2007, K. Watanabe leg. (TUA); 833, same locality and collector, 6. iv. 2008 (TUA); 733, same locality and collector, 12. iv. 2008 (TUA); 13, same locality, 6. iv. 2008, H. Katahira leg. (TUA); 233, Chiba Pref., Ichikawa city, Kokubun, 3. iv. 2002, H. Suda leg. (TUA); 1Ƥ, same locality and collector, 18. iv. 2003 (TUA); 13, Chiba Pref., Ichikawa city, Horinouchi, 13. iv. 2003, H. Suda leg. (TUA); 1Ƥ, same locality and collector, 16. iv. 2003, H. Suda leg. (TUA); 1Ƥ13, Yamanashi Pref., Koushu city, Sagashio, 1220 m, N35°40’50" E138°48’33", 17. v. 2008, H. Katahira leg. (TUA); 233, Fukui Pref., Tsuruga city, Mt. Norikura-dake, 17. v. 1980, T. Murota leg. ( NSMT); 9Ƥ 533, Aichi Pref., Nagoya city, Higashiyama park, 11–20. iv. 2001, M. Watanabe leg., Malaise trap (MU); 4Ƥ, same locality and collector, 21–30. iv. 2001 (MU); 1Ƥ333, same locality and collector, 22. iii. –7. iv. 2002 (MU); 433, Aichi Pref., Toyota city, Sanage, 22. iii. –7. iv. 2002, M. Kiyota leg., Malaise trap (MU); 3Ƥ, same locality and collector, 15–21. iv. 2002 (MU); 6Ƥ 433, Gifu Pref., Kani city, Katabira, 10–16. iv. 2004, K. Yamagishi leg., Malaise trap (MU). [Shikoku] 1Ƥ, Tokushima Pref., Mt. Koutsusan, 1100 m, 12. v. 1985, K. Oohara leg. ( NIAES); 1Ƥ, Tokushima Pref., Mt. Tsurugisan, 1300–1500 m, 4. vi. 1981, T. Goto leg. ( NIAES); 1Ƥ, Kochi Pref., Higashitsuno vil., Tengu-kogen, 25. vi. 2000, I. Yamashita leg., at light ( NIAES). [Kyushu] 13, Fukuoka Pref., Mt. Tachibana, 4–15. iv. 1976, Y. Kanamaru leg., Malaise trap ( NIAES); 1Ƥ, Fukuoka Pref., Mt. Hiko, 700m alt., 28. iv. –10. v. 1989, Takeno & Sharkey leg. ( AEI); 13, Fukuoka Pref., Innaki, 9. iv. 1982, K. Konishi leg. ( NIAES); 1133 same locality and collector, 19. iv. 1982 ( NIAES); 833, Fukuoka Pref., Mt. Innakiyama, 29. iv. 1980, R. Noda leg. ( NIAES); 233, Oita Pref., Mts Kuju, Mt. Kurodake, 5. v. 1982, K. Konishi leg. ( NIAES); 1Ƥ13, Kumamoto Pref., Mt. Kuratake, 900m alt., 14. v. 1989, M. Sharkey leg. ( AEI).

Distribution. Japan (Hokkaido, Honshu, Shikoku and Kyushu) ( Fig. 13 View FIGURE 13 ).

Etymology. The specific name is from the Latin “coelo” (notched), plus “clypeus”, referring to the characteristic notched clypeal margin.

Remarks. This species closely resembles mandibularis Kasparyan and vetulus Gravenhorst in the large anterior tentorial pit, the long and dense facial setae, and the coloration of mandible. It can be easily distinguished from them by the incomplete lower end of occipital carina (complete in mandibularis and vetulus ) and the black or brown hind femur (yellowish-brown in mandibularis ). This species was collected at the shade or edge of deciduous forests from spring to summer ( Fig. 14 View FIGURE 14 B). Especially in the short period of early spring, they are one of most common ichneumonids in the forests.