Megastylus (Megastylus) cruentator Schiødte, 1838

Watanabe, Kyohei, 2023, Taxonomic and Zoogeographic Notes on Japanese Orthocentrinae (Hymenoptera, Ichneumonidae), with Descriptions of Four New Species, Bulletin of the Kanagawa Prefectural Museum (Natural Science) 52, pp. 7-44 : 29-31

Megastylus (Megastylus) cruentator Schiødte, 1838

[New SJN: Momoboso-ashinaga-hae-himebachi]

( Figs. 15A–F)

Megastylus cruentator Schiødte, 1838: 139 .

Megastylus mediator Schiødte, 1838: 139 .

Cryptus (Helictes) cruentatus Haliday, 1838: 115 . Megastylus conformis Förster, 1871: 105 .

Megastylus fuscicornis Förster, 1871: 105 .

Megastylus nigriventris Förster, 1871: 105 .

Hemiteles pectoralis Rudow, 1886: 27 .

Helictes mediator fulvipes Constantineanu, 1939: 500 .

Diagnosis. T I and T II without longitudinal striae. Hind femur 5.9–7.2 (female) or 6.0–8.3 (male) times as long as maximum depth in lateral view. Fore wing length 4.0–7.0 mm. Female: frontal orbit without yellow markings ( Fig. 15B); mid femur 5.1–7.0 times as long as maximum depth in lateral view. Male: mesoscutum often with obscure brownish stripes or spots in middle; hind tibia tinged with black in the apical 1/3 ( Fig. 15 D); face, clypeus, mandible, palpi, ventral surface of scape and pedicel, malar space, fore and mid coxae, trochanters, propleuron, lower part and hind corner of pronotum, tegula, wing base, and sometimes frontal orbit whitish yellow ( Figs. 15D–F).

Material examined. JAPAN: NARO, 4 M, Hokkaido, Sapporo City, Jozankei , 20–31. VII. 1989, K. Maeto & M .

Sharkey leg. (MsT); NARO, 1 F & 13 M, ditto, 21–29. VIII. 1989 ; NARO, 2 F & 27 M, ditto, 29. VIII. – 12. IX. 1989 ; NARO, 4 F & 4 M, ditto, 12–21. IX. 1989 ; NARO, 1 F & 4 M, ditto, 21–28. IX. 1989 ; EUM, F, Hokkaido. Sapporo City , Hitsujigaoka, 11–18. VI. 2003 , K. Konishi leg. (MsT); EUM, 1 F & 2 M, Hokkaido , Yuni, Kuobetsu-gawa R., 2–12. VII. 2007 , N. Kuhara leg. (MsT); EUM, M, Hokkaido , Sapporo City , Misumai, Kannon-zawa, 10–22. X. 1992 , N. Kuhara leg. (MsT); KPM-NK 89805–89807 , 3 M, Hokkaido , Yubari City, Oyubari, 31. VIII. – 1. IX. 2007 , A. Ueda leg. (MsT); KPM-NK 89808 , M, Hokkaido , Sapporo City, Mt. Soranuma-dake, 27. VII. – 21. VIII. 2007 , A. Ueda leg. (MsT); KPM-NK 89809 , M, Hokkaido , Horokanai Town, Uryu, 11–17. VII. 2012 , K. Watanabe et al. leg. (MsT); KPM-NK 89813 , Hokkaido, Okushiri Is., Mt. Kamui , T. Nambu leg. (yellow pan trap); NARO, 1 F & 2 M, Hokkaido , Kamishihoro Town, Nukabira, 30. VI. 1980 , H. Takemoto leg.; NARO, F, Hokkaido , Horonobe, 25. VII. – 10. VIII. 1993 , M. Inoue leg. (MsT); NARO, F, Hokkaido , Ebetsu, Nopporo, 29. VI. – 4. VII. 1992 , K. Konishi le. (MsT); NARO, M, Hokkaido , Kimobetsu Town, Nakayama-toge, 15. VII. 1980 , K. Maeto leg.; NARO, M, Hokkaido , Akan Town, Akan-kohan, 28–29. VI. 1980 , H. Takemoto leg.; NARO, M, Hokkaido , Toyotomi Town, Kabutonuma, 12. VII. 1980 , H. Takemoto leg.; NARO, M, Hokkaido , Tomakomai Town, Hokkaido Univ. Exp. Forest, 18–20. VI. 1980 , K. Maeto leg.; EUM, M, Hokkaido , Rumoi, 1–15. VII. 2007 , Y. Nagayasu leg. (MsT); KPM-NK 89810 , M, Niigata Pref. , Nagaoka City , Suyoshi Town, Mt. Nokogiri-yama, 7–28. VI. 2014 , S. Shimizu & R. Shimizu leg. (MsT); KPM-NK 89811 , M, ditto, 28. VI. – 21. VII. 2014 ; KPM-NK 89812 , M, Niigata Pref., Myokou City , Suginosawa, Sasagamine, 17. VIII. 2013 , S. Shimizu leg.; NARO, M, Yamanashi Pref. , Minami-Alps, Mt. Kitadake, 28. VIII. 1980 , T. Goto leg.; NARO, M, Nagano Pref. , Shimashimadani, 28. VII. 1980 ; KPM-NK 89814 , M, Toyama Pref., Toyama City , Arimine, Jyurodani, 7–14. VII. 2009 , M. Watanabe et al. leg. (MsT). RUSSIA: ZISP, F (det. Rossem), Lazarevskoe , 17. IX. 1975 , D. R. Kasparyan leg.

Distribution. Japan (Kunashiri Is., Okushiri Is., Hokkaido, and Honshu); widely distributed in Palaearctic and Oriental regions ( Yu et al., 2016).

Remarks. This is the first record of this species from Okushiri Is., Hokkaido, and Honshu.