Stilbops cavigena Kasparyan, 1984

Watanabe, Kyohei & Maeto, Kaoru, 2012, Taxonomic study of the genus Stilbops Förster from Japan (Hymenoptera: Ichneumonidae: Stilbopinae), Zootaxa 3456, pp. 51-81 : 57-59

publication ID	https://doi.org/ 10.5281/zenodo.211080
DOI	https://doi.org/10.5281/zenodo.6178650
persistent identifier	https://treatment.plazi.org/id/8079878D-FFAF-FF9C-4DAD-6D44FE3E7108
treatment provided by	Plazi
scientific name	Stilbops cavigena Kasparyan, 1984
status

Treatment

Stilbops cavigena Kasparyan, 1984 View in CoL

( Figs. 2 View FIGURE 2 B, 3 B, 4 B, 5 B, 6 B, 7 B, 8 B, 9 B, 10 B, 11 A, B, 12 B, C, 13)

Stilbops cavigena Kasparyan, 1984: 141 View in CoL .

Diagnosis. Gena strongly produced ventrally, with strong concavity ( Figs. 2 View FIGURE 2 B, 3 B); lower end of occipital carina reaching base of mandible ( Fig. 4 View FIGURE 4 B); lateromedian longitudinal and lateral longitudinal carinae along area dentipara weak or partly absent ( Fig. 8 View FIGURE 8 B); metasomal tergites of female red except for base of TI ( Fig. 9 View FIGURE 9 B).

Description. Female (n=13). Body length 5.3–6.1 mm; length of fore wing 4.5–4.8 (Original description: 4.0– 5.0) mm.

Head 0.6 times as long as wide; clypeus 0.6–0.7 times as long as wide, narrowly punctate dorsally, with longitudinal striae on apical half, its margin convex to subtruncate in anterior view ( Fig. 2 View FIGURE 2 A) apex; anterior tentorial pit small ( Fig. 2 View FIGURE 2 B), its margin not concealed by setae; face 0.7–0.8 times as long as wide, punctures on center part elongate longitudinally; frons with punctuation ranging from same as to sparser than face, and with longitudinal smooth area medially; OOL 1.4 times as long as OD; POL 1.0–1.2 times as long as OD; lower end of occipital carina reaching base of mandible ( Fig. 4 View FIGURE 4 B); GOI 0.4–0.5; lower part of gena strongly concave, its margin more or less parallel in frontal view ( Figs. 2 View FIGURE 2 B, 3 B); malar space 1.0 times as long as basal width of mandible; basal position of mandible flat. Antenna with 18–19 (Original description: 18–19) flagellomeres; flagellomere I 1.1 times as long as II and terminal flagellomere 3.3–4.0 times as long as preceding one; sensilla placodea present on flagellomeres III, IV or V and following all flagellomeres.

Mesosoma ( Figs. 5 View FIGURE 5 B, 6 B, 7 B, 8 B): lower margin of pronotum not angulate ( Fig. 5 View FIGURE 5 B); upper end of epomia distant from dorsal margin of pronotum in lateral view ( Fig. 5 View FIGURE 5 B); lateral area of pronotum punctate except for smooth area, punctures on lower 0.7 sparser than upper 0.3 ( Fig. 5 View FIGURE 5 B); mesoscutum with indistinct and shallow notaulus; smooth area around episternal scrobe rather large; upper end of epicnemial carina reaching lower 0.2–0.3 of pronotum; juxtacoxal carina partly present; all carinae of propodeum present, lateromedian longitudinal carina and lateral longitudinal carinae along area dentipara weak, sometimes effaced, anterior part of lateromedian longitudinal carinae parallel, not coalescent ( Fig. 8 View FIGURE 8 B); all areas of propodeum smooth, covered with shallow punctures, area externa and area superomedia with very fine and shallow punctures or sometimes with smooth area ( Fig. 8 View FIGURE 8 B).

Fore wing: Cu-a distant from Rs&M by 0.5–0.8 times length of Cu-a; ICI 0.6–1.1. Hind wing: NI 1.4–4.0; one basal hamulus, 5 or 6 distal hamuli.

Legs: hind femur 4.7–5.0 times as long as deep in lateral view; hind tibia 8.5–9.0 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 1.4–1.5 (Original description: 1.4) times as long as maximum wide, with median dorsal carina on anterior 0.6 (Original description: 0.7–0.8), with distal depression, and lateral margin convex basally; TII and TIII (indistinct) with pair of slight round convexities; subgenital plate smooth. Ovipositor straight; ovipositor sheath 0.6–0.7 (Original description: 0.6) times as long as hind tibia.

Coloration ( Figs. 6 View FIGURE 6 B, 7 B, 9 B, 12 B): Black, except for: apical yellowish-brown spot of mandible; antenna with ventral parts of scape and pedicel, anterior part of flagellum yellow, remainder yellowish-brown to brown; yellow palpi; yellow tegula; yellow to reddish-yellow fore and mid legs; hind coxa reddish-brown except for base; yellow to reddish-yellow hind trochanter and trochantellus; hind femur reddish-yellow except for brown apex; hind tibia yellow to reddish-yellow except for brown base and apex; hind tarsal segments I and II brown except for yellow apex; hind tarsal segments III to V, claws yellow; basal part of stigma yellow; part of wing veins yellow; metasomal tergites red except for base of TI; yellow membranous part of sternites; yellow apex of ovipositor sheath; sclerotized parts of metasomal sternites and ovipositor reddish-brown to red.

Male (n=3). Similar to female: body length 6.1 mm; length of fore wing 4.8 mm. OOL 0.5 times as long as OD; POL 0.7 times as long as OD; malar space 0.7 times as long as basal width of mandible; basal portion of mandible flat. Antenna with 25 (Original description: 25) flagellomeres; terminal flagellomere 1.7 times as long as preceding one; sensilla placodea present on all flagellomeres. Hind femur 6.0 times as long as deep in lateral view; hind tibia 10.0 times as long as maximum depth in lateral view. TI 1.7 times as long as maximum width; inner margin of paramere strongly concave apically in ventral view ( Fig. 11 View FIGURE 11 A).

Coloration similar to female except for antenna and metasoma ( Fig. 12 View FIGURE 12 C), differing as follows: antenna entirely blackish-brown, except for scape, pedicel and basal part of flagellomeres I and II yellow; metasomal tergites dark brown/black, TII to TIV with anterior yellow area, posterior margin of each tergite yellow.

Specimens examined. (13Ƥ 333): JAPAN [Hokkaido] 1Ƥ, Sapporo, 6. vii. 1954, Townes Family leg. (AEI); 1Ƥ, same locality, 15. vii. 1954, David Townes leg. (AEI); 1Ƥ, Sapporo city, Mt. Soranuma-dake, 100–150 m, 14. vii. 1980, H. Takemoto leg. (NIAES); 13, Sapporo city, Hitsujigaoka, N43°00’ E141°24’, 18–25. vi. 2003, K. Konishi leg., Malaise trap (NIAES); 1Ƥ, same data except for collected in 2–9. vii. 2003 (NIAES); 2Ƥ, same data except for collected in 21–28. vi. 2007 (NIAES); 2Ƥ, same data except for collected in 28. vi – 5. vii. 2007 (NIAES); 1Ƥ, same data except for collected in 5–12. vii. 2007 (NIAES); 2Ƥ, same data except for collected in 12–19. vii. 2007 (NIAES). [Honshu] 1Ƥ, Iwate Pref., Mt. Hayachine, 400m alt., 5–11. vii. 1989, H. Makihara & M. Sharkey leg., Malaise trap (AEI); 13, same locality and collector, 1000m alt., 11–19. vii. 1989, Malaise trap (AEI). RUSSIA 13, Ussuriysk district, Gornotayezhnoye, 27. vi. 1981, D. R. Kasparyan leg. (paratype) (AEI); 1Ƥ, Partizanskiy district, Pozhiga, 125 km SE of Dal’nerechensk, 20. vii. 1983, D. R. Kasparyan leg. (paratype) (AEI).

Distribution. Japan (Hokkaido and Honshu) and Russia (Khabarovsk and Primorye Territories) ( Fig. 13 View FIGURE 13 ).

Remarks. This is the first record of this species from Japan. This species can be easily distinguished from the other Japanese species by the strong concavity of lower gena and the complete lower end of occipital carina, which reaches base of mandible.