Phygadeuon akaashii 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 : 65-67

Phygadeuon akaashii Uchida, 1930 (SJN: Akaashi-futakobu-chibi-togari-himebachi)

( Figs 3A–D )

Phygadeuon akaashii Uchida, 1930: 338 .

Description. Female (n=6). Body length 4.6–6.4 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 ( Fig. 3C ), its anterior margin narrowly marginate except for a pair of median teeth. Face densely punctate. Frons with smooth areas above antennal sockets. Length of malar space 0.7–0.75 times as long as basal width of mandible. Maximum width of gena as wide as eye in lateral view. OD: POL: OOL = 0.5: 0.6–0.8: 0.85–1.0. 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 flat. AntEnna with 17–18 flagEllomErEs, subapical part slightly widened. Length of FL I 2.2–2.5 times as maximum depth of FL I in lateral view and 0.7–0.9 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 punctate. Notaulus distinct and weak, its posterior end not beyond the centre of mesoscutum. Scutellum punctate, without a lateral longitudinal carina except for base. Mesopleuron covered with sparse punctures except for a large smooth area on speculum and its anterior area. Epicnemial carina present laterally, its dorsal end not reaching anterior margin of mesopleuron. Sternaulus complete. Posterior transverse carina of mesosternum largely absent in front of middle coxa. Metapleuron punctate, with a complete juxtacoxal carina. Propodeal carinae and areas complete. Postero-lateral corner of area densipara weakly projected. Area basalis as wide as area superomedia. Area superomedia wider than long, receiving lateral section of anterior transverse carina near or just behind of middle ( Fig. 3D ). Length of fore wing 4.1–5.0 mm. Areolet present. Vein 1cu-a interstitial to vein M&RS. Nervellus subvertical, intercepted near posterior 0.75. Hind femur 3.9–4.1 times as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 2.0: 0.9: 0.7: 0.3: 0.8. Tarsal claws simple.

Metasoma. T I 1.8–1.9 times as long as maximum width, smooth except for postero-lateral area with a few longitudinal striae ( Fig. 3D ). Median dorsal carina of T I present except for area near posterior margin. Dorsolateral carina of T I complete except for area near spiracle. T II 0.55–0.73 times as long as maximum width, largely smooth. T III largely smooth. T V to T VI smooth basally and finely punctate posteriorly. T VI and T VII usually concealed under T V in dried specimen. Ovipositor sheath 0.4–0.5 times as long as hind tibia. Ovipositor straight, with an indistinct nodus and ventral teeth.

Coloration ( Figs. 3A–D ). Body (excluding wings and lEgs) black to blackish brown. Basal sEgmEnts of flagEllum, pedicel, mandible except for apex and base, tegula, and apical margin of T II tinged with reddish brown. Membranous part of metasomal sternites yellowish brown. Ovipositor reddish brown. Metasomal tergites sometimes partly tinged with dark reddish brown. Wings hyaline. Veins and pterostigma brown to blackish brown except for base of pterostigma whitish yellow. Legs reddish brown. Apex of hind femur, base and apical part of hind tibia, and hind tarsus blackish brown.

Male. Not examined in this study.

Materials examined. JAPAN: KPM-NK 81851, F, Yamanashi Pref., Ichinose , 7. IX. 1982, T. Murota leg. ; KPM-NK 81854, F, Fukui Pref., Arashi , 23. IX. 1973, T. Tano leg. ; KPM-NK 81855, F, ditto, 29. IX. 1973 .; KPM-NK 81853, 81856, 81857, 3 F, ditto, 4. X. 1973 .

Distribution. Japan (Hokkaido, Honshu, and Shikoku).

Bionomics. Host record: Istochaeta aldrichi (Mesnil, 1953) ( Diptera , Tachinidae ) ( Kato, 1935); Sarcophaga sp. ( Diptera , Sarcophagidae ) ( Minamikawa, 1969).

Remarks. KPM-NK 81853 has been compared with the lectotype deposited in SEHU.

Figures

Fig. 3. Phygadeuon akaashii Uchida, 1930, females (A, B, D: KPM-NK 81851; C: KPM-NK 81853). A: lateral habitus; B: dorsal habitus; C: head, frontal view; D: scutellum, propodeum, and T I, dorsal view.