Acrolyta rufocincta ( Gravenhorst, 1829 )

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 : 62-64

Acrolyta rufocincta ( Gravenhorst, 1829)

(New SJN: Kimura-mame-togari-himebachi)

( Figs 5A–D , 62G )

Hemiteles rufocinctus Gravenhorst, 1829: 811 .

Hemiteles distinctus Bridgman, 1883: 151 .

Hemiteles capreolus Thomson, 1884: 970 .

Hemiteles 4-maculatus Lange, 1911: 542.

Hemiteles monodon obscurata Kiss von Zilah, 1924: 74 .

Hemiteles unifasciatus Kiss von Zilah, 1924: 74 .

Description based on Japanese materials. Female (n=12). Body length 3.7–5.1 mm. Body covered with silver setae.

Head. Clypeus 1.7–1.8 times as wide as maximum length, its anterior margin rounded, with a pair of distinct teeth anteromedially ( Fig. 62G ). Face granulate ( Fig. 5B ). MSL 0.95–1.0 times as long as BWM. Malar space smooth except for coriaceous anterior part. Frons, vertex, and gena largely smooth, with fine and sparse punctures. OOL distinctly longer than POL. Occipital carina complete, joined with hypostomal carina near mandibular base. Upper tooth of mandible slightly longer than lower tooth. Base of mandible weakly convex. Antenna with 24–26 flagellomeres, median and subapical parts slightly widened ( Fig. 5A ), 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 3.4–3.6 times as long as maximum depth in lateral view.

Mesosoma. Pronotum with smooth areas on collar and dorsal part, without epomia. Mesoscutum matt ( Fig. 5C ) and subpolished except for longitudinally striated posterior part, with distinct notaulus. Scutellum polished, punctate. Mesopleuron with longitudinal striae. Metapleuron punctate and granulate, with a complete juxtacoxal carina. Anterior and posterior transverse carinae of propodeum complete. Area basalis distinct. Area superomedia indistinct. Anterior part of propodeum finely and sparsely punctate. Median and posterior parts of propodeum covered with longitudinal, oblique and irregular rugae. Length of fore wing 3.2–3.8 mm. Areolet absent ( Fig. 5D ). Vein 2m-cu of fore wing with two bullae ( Fig. 5D ). Nervellus inclivous, intercepted behind the middle ( Fig. 5D ). Hind femur 5.2 times as long as maximum depth in lateral view. Hind TS I: II: III: IV: V = 2.0: 0.9: 0.6: 0.2: 0.4. Tarsal claws simple.

Metasoma. T I 1.9–2.0 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 posterior smooth areas ( Fig. 5C ). T III, T IV, and T V sparsely punctate except for posterior smooth areas. Ovipositor sheath 0.53–0.58 times as long as hind tibia. Ovipositor straight, with a nodus and ventral teeth.

Coloration ( Figs 5A–D ). Body (excluding wings and legs) black to blackish brown. Basal part of antenna reddish brown. Mandible partly tinged dark yellowish brown. Metasomal tergites partly tinged with reddish brown to reddish yellow, usually T II and T III completely reddish. Membranous part of metasomal sternites and ovipositor reddish brown. Wings hyaline. Veins and pterostigma blackish brown to brown. Legs reddish brown to yellowish brown. Apex of hind femur, tibia, and each tarsal segment tinged with black. Hind femur and tibia sometimes largely tinged with blackish brown.

Male. Not studied in this study.

Materials examined. JAPAN: KPM-NK 55008 , F, Niigata Pref., Nagaoka City, Suyoshi Town, Mt. Nokogiriyama , 25. V. – 7. VI. 2014, S. Shimizu & R. Shimizu leg. (MsT) ; KPM-NK 81728 , F, Kanagawa Pref., Hadano City, Mt. Koubou-yama , 5. IV. 2007, K. Watanabe leg. ; KPM-NK 55010–55012 , 3 F, Kanagawa Pref., Yamakita Town, Nakagawa , 3. IX. 2019 (host coll.), IX. 2019 em., Y. Komura leg. ; KPM-NK 55006 , 55007 , 81727 , 3 F, Shizuoka Pref., Honkawane Town, Mt. Yamainudan , 14. VI. 2008, K. Watanabe leg. ; KPM-NK 81726 , F, Toyama Pref., Nanto City, Togamura, Kamimomose , 21–28. VII. 2009, M. Watanabe et al. leg. (MsT) ; KPM-NK 81724 , F, Fukui Pref., Imajo Town, Kinometoge , 14. VIII. 1981, H. Kurokawa leg. ; KPM-NK 81725 , F, Hyogo Pref., Shinonsen Town, Kishida , 12. X. 2012, S. Fujie leg. ; KPM-NK 55009 , F, Hyogo Pref., Toyooka City, Mesaka, Nasa forest park, 9. X. 2011, S. Fujie leg. GERMANY: ZSM, F, (det Horstmann), Eiderstedt grüne Insel Vorland , 10. VIII. 1964 .

Distribution. Japan * (Honshu); widely distributed in Western Palearctic region.

Bionomics. KPM-NK 55010–55012 were emerged from the cocoon of versicolor subgroup of Meteorus sp. ( Hymenoptera , Braconidae ). The all cocoons were parasitized by this species and Gelis areator (Panzer, 1804) ( Hymenoptera , Ichneumonidae ). Outside Japan, some microlepidoptera and braconids have been recorded as the hosts (see Yu et al., 2016).

Remarks. This is the first record of this species from Japan and Eastern Palearctic region. Schwarz & Shaw (2000) described the clypeus with “a distinct tooth” while all Japanese specimens with a pair of distinct teeth. However other character states of both Japanese and European specimens are almost identical. Thus, I identify the Japanese specimens as this species.

Figures

Fig. 5. Acrolyta rufocincta (Gravenhorst, 1829), KPM-NK 55012, female from Japan ― A, lateral habitus; B, head, frontal view; C, head, mesosoma, and metasoma, dorsal view; D, wings.

Fig. 62. Bathythrix kuwanae Viereck, 1912 (A, KPM-NK 81718), Ba. margaretae Sawoniewicz, 1980 (B, KPM-NK 55017), Ba. thomsoni (Kerrich, 1942) (C, KPM-NK 81675), Diaglyptidea conformis (Gmelin, 1790) (D, KPM-NK 81645), Nipponaetes haeussleri (Uchida, 1933) (E, KPM-NK 81832), Acrolyta japonica sp. nov. (F, N, KPM-NK 54996, holotype), Acr. rufocincta (Gravenhorst, 1829) (G, KPM-NK 81732), Surculus japonicus sp. nov. (H, KPM-NK 81861, holotype), Isadelphus nigrus sp. nov. (I, KPM-NK 82003, holotype), Lochetica japonica sp. nov. (J, KPM-NK 81989, holotype), Megacara similis Sheng, 1999 (K, KPM-NK 81837), Gnotus chionops (Gravenhorst, 1829) (L, KPM-NK 82100), Gn. striatus (Uchida, 1930) (M, KPM-NK 82060), and Acr. flavicoxis Sheng & Sun, 2014 (O, KPM-NK 81837), females from Japan ― A–C, head, frontal view; D, E, head, lateral view; F–K, anterior margin of clypeus; L, M, mandible; N, O, basal part of antenna, lateral view.