Megastylus (Dicolus) excubitor (Förster, 1871)

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

(Figs. 12A–C, 23G, H)

Dicolus excubitor Förster, 1871: 97 .

Diagnosis. Fore TS I longer than half length of fore tibia (Fig. 23G). Antennal cleaner of fore TS I large, causing conspicuous outcurving of base of TS I (Figs. 23G, H). Inner eye orbit almost parallel (Fig. 12B). Propodeum without anterior transverse carina. Hind tibia not distinctly narrowed in apical 1/3 (Fig. 12A). T I and T II without longitudinal striae. In female: fore wing length 4.5–6.0 mm. FL I 6.0–8.5 times as long as maximum depth in lateral view. In male: T I 3.5 times as long as maximum width; FL I shorter than 7.6 times as long as maximum depth in lateral view; mesopleuron and scutellum sometimes yellow.

Material examined. JAPAN: KPM-NK 89786, F, Yamagata Pref., Nishikawa T., Shizu, Mt. Gassan, 19. VI. 2015, K. Watanabe leg. ; KPM-NK 89787, F, Yamanashi Pref., Koushu City, Sagashio, 6. VIII. 2008, K. Watanabe leg. ; KPM-NK 89788, F, Nagano Pref., Outaki Vil., Mt. Ontake-san, Hakkaisan, 8. VIII. 2010, K. Watanabe leg. ; OMNH, F, Nagano Pref., Hara Vil., 5. IX. 2015, M. Ito leg. ; KPM-NK 89789, F, Toyama Pref., Toga Vil., Kamimomose, 15–29. IX. 2009, M. Watanabe leg. (MsT) ; KPM-NK 89790, F, Kagoshima Pref., Yakushima Is., Kankake, 1. V. – 5. VI. 2007, T. Yamauchi et al. leg. (MsT); KPM-NK 89791, F, Kagoshima Pref., Yakushima Is., Hanyama, 2. XI. – 1. XII. 2007, T. Yamauchi et al. leg. (MsT). RUSSIA: ZISP, F (det. Rossem), Crimea, Frunzenskoye, 1. VII. 1978, D. R. Kasparyan leg.

Distribution. Japan (Honshu and Yakushima Is.); widely distributed in Palaearctic region (Yu et al., 2016).

Remarks. This is the first record of this species from Japan.