Acrolyta aporiae (Okamoto, 1921)

Watanabe, Kyohei, 2021, Taxonomic and Zoogeographic Study of the Japanese Phygadeuontinae (Hymenoptera, Ichneumonidae), with Descriptions of 17 New Species, Bulletin of the Kanagawa Prefectural Museum (Natural Science) 50, pp. 55-136 : 58-59

Acrolyta aporiae (Okamoto, 1921)

(SJN: Tatehida-mame-togari-himebachi)

( Figs 1A–D )

Brachycyrtus aporiae Okamoto, 1923: 64 .

Hemiteles aporiae Uchida, 1930: 343 .

Description. Female (n=2). Body length 3.3–3.4 mm. Body covered with silver setae.

Head. Clypeus 1.9 times as wide as maximum length, its anterior margin rounded, without distinct teeth anteromedially. Face granulate ( Fig. 1B ). MSL 1.1 times as long as BWM. Malar space polished and coriaceous. Frons and anterior part of vertex matt except for smooth area above antennal sockets. Posterior part of vertex and gena polished, with fine punctures. OOL almost as long as POL. Occipital carina complete, joined with hypostomal carina near mandibular base. Upper tooth of mandible almost as long as lower tooth. Base of mandible flat. Antenna with 20 flagellomeres, median and subapical part strongly widened, the most widened part ca. 2.0 times as long as maximum depth of FL I in lateral view. FL I, FL II, and FL III distinctly longer than other segments. FL III 3.0 times as long as maximum depth in lateral view.

Mesosoma. Lateral part of pronotum largely smooth dorsally, rugulose ventrally, with indistinct epomia. Mesoscutum matt and subpolished, with distinct notaulus. Scutellum polished, punctate. Mesopleuron smooth, with some longitudinal striae ventrally. Metapleuron finely and sparsely punctate, with a complete juxtacoxal carina. Anterior and posterior transverse carinae of propodeum complete. Area basalis distinct. Area superomedia distinct or partly indistinct laterally. Anterior part of propodeum finely and sparsely punctate. Median and posterior parts of propodeum covered with shallow, longitudinal, oblique and irregular rugae. Length of fore wing 3.2 mm. Areolet absent ( Fig. 1D ). Vein 2m-cu of fore wing with two bullae. Nervellus inclivous, intercepted behind the middle ( Fig. 1D ). Hind femur 4.3 times as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 2.0: 0.9: 0.7: 0.3: 0.4. Tarsal claws simple.

Metasoma. T I 1.5–1.6 times as long as maximum width, longitudinally striated. Median dorsal carina of T I present except for posterior part absent. Dorsolateral carina of T I complete. T II covered with longitudinal striae except for smooth area on posterior 0.5 ( Fig. 1C ). T III to T V sparsely punctate except for posterior smooth areas. Ovipositor sheath 0.73 times as long as hind tibia. Ovipositor straight, with a nodus and ventral teeth.

Coloration ( Figs 1A–D ). Body (excluding wings and legs) black to blackish brown. Ventral parts of scape and pedicel and base of FL I yellowish brown to reddish brown. Mandible yellow except for darkened apex. Palpi, postero-dorsal corner of pronotum, and tegula yellow. Posterior margin of metasomal tergites (it of T II to T IV wider than other tergites) reddish brown. Metasomal tergites more or less tinged with reddish brown. Membranous part of metasomal sternites and ovipositor reddish brown. Wings hyaline. Veins and pterostigma yellowish brown to brown. Legs reddish brown to yellowish brown. Fore and mid coxae, trochanters, and trochantelli yellow. Base of hind coxa, base and apical parts of hind tibia, and TS V more or less tinged with blackish brown.

Male. Not studied in this study.

Materials examined. JAPAN: SEHU, F (lectotype), Hokkaido, “Sapporo, H. Okamoto ” (em. from Aporia crataegi ) ; KPM-NK 54995 , F, Hokkaido, Horokanai Town, Moshiri, Uryu , 11–17. VII. 2012, K. Watanabe leg. (MsT) .

Distribution. Japan (Hokkaido).

Bionomics. Host record: Aporia crataegi adherbal Fruhstorfer, 1910 ( Lepidoptera , Pieridae ) ( Okamoto, 1923).

Remarks. According to Yu et al. (2016), this species was described in 1921, but the actual description year is 1923.

Figures

Fig. 1. Acrolyta aporiae (Okamoto, 1921), KPM-NK 54955, female from Japan ― A, lateral habitus; B, head, frontal view; C, head, mesosoma, and metasoma, dorso-lateral view; D, wings.