Dentilabus nigripodus Kikuchi & Konishi, 2018

Kikuchi, Namiki & Konishi, Kazuhiko, 2018, Two new species of Dentilabus Heinrich (Hymenoptera: Ichneumonidae: Ichneumoninae) from Japan and Korea, with redefinition of the genus, Zootaxa 4524 (1), pp. 87-96 : 89-92

Dentilabus nigripodus Kikuchi & Konishi , new species.

Figs 1, 2 , 5–13 , 15–19 .

Type series. Holotype, ♀, JAPAN: Namakusa-dani, Odamiyama, Kita-gun , Ehime Prefecture, Shikoku , 28. VII. 2000, Eiji Yamamoto (EUMJ). Data label: “(Ehime JAPAN) / Namakusa-dani / Odamiayama / 28. VII. 2000 / E. Yamamoto ”

Paratypes, JAPAN: [Hokkaidô] 1♂, Bekanbeushi marsh, Akkeshi Town [43.105N, 144.875E, MT] , 12–31. VII. 2003, Rikio Matsumoto ( OMNH) ; 2♂ (2–17. VII. 2010), 1♂ (17–31. VII. 2010), Headwaters of Sarugawa river, Niisho-tôge [42.974N, 142.749E, MT] , N. Kuhara ( EUMJ) ; 1♂ (9–23. VII. 2007), 1♂ (23. VII. – 5. VIII. 2007), Brooklet near Noborikawa-tunnel, Yubari [42.919N, 142.116E, MT] , N. Kuhara ( EUMJ) ; 1♀, Kamuikotan, Asahikawa City , 16. VIII. 1982, K. Furukawa ( SEHU) ; 1♂ (15–27. VII. 1994), 1♂ (27. VII. – 13. VIII. 1994), Misumai, Sapporo City, N. Kuahara ( EUMJ) ; 1♂, Kan’non-zawa, Misumai, Sapporo City , 16–27. VII. 1992, N. Kuahara ( NIAES) . [ Honshû ] Ishikawa Pref .: 1♂, Fukuoka, Kawachi-mura , 8. IX. 1989, I. Togashi ( NIAES) . Hyôgo Pref .: 1♂, Nakusa, Myôken, Tajima , 9. VIII. 1952, K. Iwata ( MNHAH) ; 1♂, Fujioka, Sasayama , 10. VI. 1953, S. Taniguchi ( MNHAH) ; 1♂, Tanba, Sasayama , 17. VI. 1953, K. Nohara. Okayama Pref .: 1♂, Kanba , Okayama, 8. VI. 1947, J. Minamikawa ( NIAES) . [ Shikoku ] Ehime Pref .: 2♂ (29. VI. 2000), 1♀ 1♂ (4. VII. 2000), 2♂ (10. VII. 2000), 1♀ (27. VII. 2000), 2♂ (8. VIII. 2000), 3♂ (15. VIII. 2000), 6♂ (21. VIII. 2000), 1♀ (4. IX. 2000), Namakusa-dani, Odamiyama, Kita-gun, Eiji Yamamoto ( EUMJ) ; 3♂ (6. VII. 2000), 1♂ (15. VII. 2000), Koyayama, Odamiyama, Eiji Yamamoto ( EUMJ) & 1♂ (25. IX. 1994), same locality and collector, ( NIAES) . [ Kyûshû ] Fukuoka Pref .: 1♂ (24. V. 1956), 1♀ (25. V. 1956), Hikosan, S. Momoi, ( MNHAH) . KOREA: [Gangwon-do] 1♂, Mt. Gariwang, Daehwa-ri , Pyeongchang-gun [37.530N, 128.498E, MT] , JD. Yeo & JD Yoon ( NIBR, IN0000199569 ) .

Coloration. Body ground color black and covered with short white setae ( Fig. 1, 2 ). Vertex with a pair of white spots along eye margin ( Fig. 5 ); suplaclypeal area with a pair of white spots along eye margin in female, a pair of white lines along eye margin in male ( Fig. 7 ) (white colorings on head of female often absent as in Fig. 6 but in males usually developed). Flagellum with white semiannulus on flagellomeres 7(8)– 11 in female, 9–13 in male. Apex of collar of pronotum with or without single white spot. Subalar ridge, scutellum and postscutellum with or without white spot; propodeal spine white or black, in some specimens white spots extending from propodeal spine to entire of third lateral area. Wing veins dark to light brown. Metasomal T1 with or without a pair of white spots on apicolateral margin of postpetiole; T2 with apical white band; T3 with or without apical white margin; T6 and T7 with broad white band on apex.

Female. Body length 7.9–11.0 mm.

Head. Surface of vertex and gena coriaceous, with rather shallow punctures (often almost without punctures); area between anterior ocellus and antennal cavity weakly strigose; suplaclypeal area and clypeus almost polished to weakly granulate, with punctures; malar space finely granulate. Head 1.9–2.0 × as wide as long in dorsal view; postocciput 0.5–0.6 × as wide as head in dorsal view; OOL/POL = 1.0–1.6 ( Fig. 5 ). Suplaclypeal area 1.6–1.9 × as wide as high; clypeus 1.9–2.3 × as wide as high ( Fig. 6 ). Mandibles 1.7–2.0 × as long as mandibular base; lower tooth 0.3–0.4 × as long as upper tooth length. Malar space 0.7–0.9 × as wide as base of mandible. Occipital carina meeting hypostomal carina above base of mandible by 0.7–0.9 × width of mandibular base. Maxilla with 5th segment of palpus 1.8–1.9 × as long as mandibular base.

Antenna. Flagellum 8.2–9.8 mm long, with 33–35 flagellomeres; apical flagellomere conical; 1st flagellomere 4.8–6.3 × as long as apical width and 1.3–1.6 × as long as the 2nd.

Mesosoma. Surface of pronotum densely punctate except lower half rugose ( Fig. 9 ); mesoscutum finely granulate, with dense punctures; dorsal surface of scutellum sparsely punctate and posterior surface of scutellum rather densely punctate; postscutellum polished and the anterior edge weakly rugulose ( Fig. 10 ); mesopleuron densely punctate except around mesopleural fovea sparsely punctate; metapleuron densely punctate ( Fig. 10 ); propodeum rugose or rugose-punctate, area of areola coarsely rugose ( Fig. 9 ). Mesoscutum 1.4–1.5 × as long as wide. Notaulus indistinct ( Fig. 9 ). Sternaulus indistinct; postpectal carina absent. Lateral carinae of scutellum reaching apex, hind margin not carinated. Propodeum in profile, basal area flat and evenly slanted from base of areola; juxtacoxal carina present, often indistinct in basal half; areola quadrangular 0.9–1.1 × as long as wide and 0.3–0.4 × as wide as distance of propodeal spiracles; petiolar area 1.7–2.4 × as long as areola. Propodeal spiracle 2.2–2.8 × as long as wide.

Legs. Surface of legs polished with shallow punctures. Hind tibia 0.4 × as long as fore wing.

Wings ( Fig. 13 ). Fore wing 7.0–9.0 mm long; areolet 0.8–0.9 × as long as 3rs-m, 0.3 × as high as 2m-cu, quadrangular and slightly petiolate; Cu-a opposite Rs&M; ramulus developed or absent. Hind wing with cu-a 0.3– 0.4 × as long as first abscissa of Cu1; 1–2 basal hamuli, 8–10 distal hamuli on R1 vein.

Metasoma. Surface of T1 polished with weak punctures or wrinkles; lateral area of petiole rugose punctate; T2 and basal half of T3 densely punctate; T4–T7 coriaceous. Petiole bend obtuse angle, in profile the angle between petiole and postpetiole 120–125°; in dorsal view broadened posteriorly; T1 1.8–2.1 × as long as wide. Second tergite in dorsal view 0.8–1.2 × as long as wide at apex. Inter-thyridiae interval 0.3–0.5 × as long as thyridium; inter-thyridiae area strongly to moderately depressed.

Male. Body length 8.0– 11.2 mm. As in female except for following: first flagellomere 3.2–4.4 × as long as apical width; scutellum more coarsely punctate; hind tibia 0.4 × as long as fore wing; apical margin of subgenial plate rounded; male genitalia as in Figs 17–19 , paramere with transparent areas as in Fig. 19 , apex of paramere truncate, penis valve with apex tapering and elongate and with a small hook on ventral margin at around apical 1/3 ( Fig. 17 ).

Remarks. This species resembles the European species, D. variegatus , the type species of the genus, and the differences are very small, but it is distinguished by coloration; often pale spots on the face of females reduced or absent (in D. variegatus usually distinct), scutellum and teeth on propodeum often uniformly black (in D. variegatus , usually white or whitish yellow), and all femora and tibiae almost uniformly black (in D. variegatus , although often hind tibiae and apical 1/3 of hind femora becoming black, usually all femora and tibiae mostly reddish brown to orange). In addition, the propodeum in profile is rather long and basal area is not clearly depressed (in D. variegatus , propodeum in profile shorter and basal area considerably depressed), and bending angle of T1 is a little more acute than in D. variegatus , are useful to distinguish the two species.

Figures

FIGURES 1–4. Habitus of Japanese Dentilabus spp. 1. D. nigripodus sp. n., holotype (female), 2. ditto, paratype (male, from Namakusa-dani), 4. D. iyoensis sp. n., holotype (female), 4. ditto, paratype (male). Scale bars = 1.0 mm.

FIGURES 5–12. Dentilabus nigripodus sp. n. 5, 6, 9, 11: holotype, 7: paratype, male from Namakusa-dani, 8: paratype, male from Fujioka, 10, 12: paratype, female from Kamuikotan. 5. head in dorsal view, 6, 7. head in frontal view, 8. scutellum to propodeum, 9. mesosoma in dorsal view, 10. mesosoma in profile, 11. metasoma, in dorsal view 12. metasoma in profile. Scale bars = 1.0 mm.

FIGURES 13, 14. Wings of Japanese Dentilabus spp. 13. D. nigripodus sp. n., holotype, 14. D. iyoensis sp. n., holotype. Scale bars = 1.0 mm.

FIGURES 15–19. Metasomal sternites and genitalia of D. nigripodus sp. n., paratype, male from Namakusa-dani. 15. Metasomal sternites 2–7, 16. male subgenital plate (8th sternite), 17. right aedeagus in profile, 18. aedeagus in dorsal view, 19. left paramere and volsella in mesal view. Scale bars = 0.1 mm except for 15 = 1.0 mm.