Phygadeuon elongatus ( Uchida, 1930 )

Watanabe, Kyohei, 2022, Distribution Records and Re-descriptions of Some Japanese Species of the Subfamily Phygadeuontinae (Hymenoptera, Ichneumonidae), Bulletin of the Kanagawa Prefectural Museum (Natural Science) 51, pp. 61-72 : 67-68

Phygadeuon elongatus ( Uchida, 1930) (SJN: Naga-futakobu-chibi-togari-himebachi)

( Figs 4A–D )

Ischnocryptus elongatus Uchida, 1930: 338 .

Description. Female (n=3). Body length 6.9–8.0 mm. Body polished, covered with silver setae.

Head 0.65–0.7 times as long as wide in dorsal view. Clypeus 0.4 times as wide as maximum length, sparsely punctate dorsally, punctate along anterior margin except for a pair of median teeth. Face densely punctate. Frons largely smooth above antennal sockets. Length of malar space 0.7–0.75 times as long as basal width of mandible. Maximum width of gena distinctly wider than eye in lateral view. OD: POL: OOL = 0.5: 0.7–1.0: 1.1–1.2. Occipital carina complete, its lower end joined with hypostomal carina distant from mandibular base. Upper tooth of mandible slightly longer than lower tooth. Base of mandible shallowly concave. Antenna with 18–20 flagEllomErEs, subapical part slightly widEnEd. LEngth of FL I 2.2 times as maximum depth of FL I in lateral view and 0.7–0.85 times as long as length of FL II.

Mesosoma. Lateral part of pronotum punctate dorsally, with oblique and longitudinal rugae postero-ventrally. Epomia weakly present. Mesoscutum sparsely punctate. Notaulus indistinct and weak. Scutellum sparsely punctate, without a lateral longitudinal carina except for base. Mesopleuron covered with sparse punctures except for a smooth area on speculum. Epicnemial carina present laterally, its dorsal end not reaching anterior margin of mesopleuron. Sternaulus present except for posterior 0.1. Posterior transverse carina of mesosternum largely absent in front of middle coxa. Metapleuron punctate, with a complete juxtacoxal carina. Propodeal carinae and areas complete (sometimes carinae partly and narrowly indistinct: Fig. 4D ). Postero-lateral corner of area densipara not projected. Area basalis as wide as area superomedia. Area superomedia as long as wide, receiving lateral section of anterior transverse carina just behind of middle ( Fig. 4D ). Length of fore wing 5.9–6.7 mm. Areolet present. Vein 1cu-a interstitial to vein M&RS. Nervellus subvertical, intercepted near posterior 0.6–0.7. Hind femur 3.2–3.6 times as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 2.0: 0.9–1.0: 0.7: 0.3–0.35: 0.8–0.9. Tarsal claws simple.

Metasoma. T I 1.9–2.4 times as long as maximum width, largEly covErEd with minutE and finE striaE. MEdian dorsal carina of T I present except for posterior part. Dorsolateral carina of T I present in front of spiracle. T II 0.8–1.1 times as long as maximum width, largely smooth. T III to T VII smooth, with minute punctures. Ovipositor sheath (HT: 0.55) 0.65–0.75 times as long as hind tibia. Ovipositor straight to slightly decurved, without nodus and indistinct ventral teeth.

Coloration ( Figs. 4A–D ). Body (excluding wings and lEgs) black to blackish brown. Basal sEgmEnts of flagEllum and pedicel partly tinged with brown. Mandible except for base and apex, T II, and T III reddish brown. Membranous part of metasomal sternites and ovipositor dark yellowish brown. Wings hyaline. Veins and pterostigma brown to blackish brown except for apex and base of pterostigma whitish yellow. Legs black to blackish brown. Fore and mid trochantelli, femora, tibiae, and tarsus reddish brown. Tibial spurs yellowish brown. Subbasal part of hind tibia tinged with reddish brown.

Male. Unknown.

Materials examined. JAPAN: KPM-NK 81800, F, Gunma Pref., Katashina Vil., Marunuma, Yuzawa , 12. VII. 2014, K. Watanabe leg. ; KPM-NK 81801, F, Nagano Pref., Outaki Vil., Mt. Ontakesan, Hakkaisan , 17. VII. 2007, K. Watanabe leg. ; KPM-NK 81802, F, Fukui Pref., Ikeda town, Mizuumi Mt. Heko-san, 18. VI. 2016, S. Shimizu leg.

Distribution. Japan (Hokkaido and Honshu); Far East Russia.

Bionomics. Unknown.

Remarks. KPM-NK 81802 has been compared with the holotype deposited in SEHU. The above additional specimens differ from the holotype in the body length (6.9–8.0 mm in the additional specimens, “ 11 mm ” in holotype) ( Uchida, 1930), while I judged that this character statE is an intraspEcific variation. ThE abovE rEcord is thE first of this spEciEs from Honshu.

Figures

Fig. 4. Phygadeuon elongatus (Uchida, 1930), female, KPM-NK 81801. A: dorsal habitus; B: lateral habitus; C: head, frontal view; D: propodeum, dorsal view.