Rhaconotus formosanus Watanabe, 1934

Cao, Liang-Ming, Achterberg, Cornelis Van, Tang, Yan-Long, Wang, Xiao-Yi & Yang, Zhong- Qi, 2020, Revision of parasitoids of Massicus raddei (Blessig & Solsky) (Coleoptera Cerambycidae) in China, with one new species and genus, Zootaxa 4881 (1), pp. 104-130 : 121

11. Rhaconotus formosanus Watanabe, 1934

Fig. 14

Rhaconotus formosanus Watanabe, 1934: 119 ; Shenefelt & Marsh 1976: 1337; Belokobylskij 1998: 69; Belokobylskij & Chen, 2004a: 354; Belokobylskij & Maeto, 2009: 422; Yu et al., 2016.

Material examined. 1♀, NE China, Liaoning Province, Kuandian County, Daxicha Forest , 28.VII.2009, N40°44′58″, E125°11′35″, 446 m altitude, Tang Yan-Long; 1♀, id., but 25.VI.2009.

Hosts. Parasitoid of Massicus raddei (new record).

Distribution. China (Fujian, Hainan, Hubei, Jilin, Liaoning, Taiwan, Yunnan, Zhejiang), Australia, Caroline Islands, Indonesia, Japan, Korea, Malaysia, Russia, Vietnam.

Remarks. Body length ♀ 3.2–3.6 mm. According to the holotype’s figures provided by National Natural Sci-ence Museum of Taiwan (2019), Watanabe’s original description ( Watanabe 1934), the key to this genus for China ( Belokobylskij & Chen 2004a) and detailed redescription of Japanese specimens ( Belokobylskij & Maeto 2009), our specimens from Liaoning belong to R. formosanus . Nevertheless, there are some minor differences, e.g., frons and vertex black, face and gena dark brown ( Figs 14 A-C) (vs. frons, vertex, face and gena entirely yellow in holotype); ovipositor sheath 0.7 times as long as metasoma ( Fig. 14A ) (vs. ovipositor sheath 0.9 × as long as metasoma in holotype); medio-longitudinal carina of propodeum 0.4 × as long as median length of propodeum ( Fig. 14D ) (vs. medio-longitudinal carina of propodeum 0.2 times as long as median length of propodeum in holotype ( Fig. 1 of Watanabe 1934)), but we consider the differences to be part of intraspecific variation in R. formosanus . Only two females have been collected, which indicates that it is an occasional parasitoid of M. raddei .

Figures

FIGURE 1. Megarhyssa praecellens (Tosquinet), ♀ A Habitus, dorsal aspect, scale bar = 20 mm B Head and mesosoma, dorsal aspect, scale bar = 2 mm C Head and mesosoma (part), lateral aspect, scale bar = 2 mm D Mesosoma, lateral aspect, scale bar = 2 mm.

FIGURE 14. Rhaconotus formosanus Watanabe, ♀ A Habitus, lateral aspect, scale bar = 1.5 mm B Head, dorsal aspect, scale bar = 0.25 mm C Head, frontal aspect, scale bar = 0.25 mm D Mesosoma, dorsal view, scale bar = 0.5 mm E Fore wing, scale bar = 1 mm F Hind wing, scale bar = 1 mm G Metasoma, dorsal aspect, scale bar = 0.5 mm.