Tremex apicalis Matsumura, 1912

Fu, Yuanzun, Yuan, Yuan, Shen, Qian, Xu, Hao, Ye, Zheng, Guo, Li, Wu, Xiaoliang & Zhao, Yunhe, 2021, Taxonomic Notes and New Distribution and Host Plant Records for Sawflies and Woodwasps (Hymenoptera, Symphyta) of Japan VI, Bulletin of the National Museum of Nature and Science. Series A, Zoology 47 (4), pp. 163-188 : 166

Tremex apicalis Matsumura, 1912

Japanese name: Kuro-hiraashi-kibachi

( Fig. 1C )

Host plants. Betulaceae : Alnus japonica (Thunb.) Steud. (new record), Betula ( Shinohara and Hara, 2020) . Cornaceae : Swida ( Kuramitsu et al., 2019) . Eupteleaceae : Euptelea ( Kuramitsu et al., 2019) . Fagaceae : Quercus ( Okutani, 1967a) , Lithocarpus ( Shinohara and Hara, 2020) . Juglandaceae : Juglans mandshurica Maxim. var. sachalinensis (Komatsu) Kitam. (new record). Magnoliaceae : Magnolia ( Kuramitsu et al., 2019) . Oleaceae : Fraxinus ( Kuramitsu et al., 2019) . Rosaceae : Cerasus ( Okutani, 1967a) . Salicaceae : Populus ( Okutani, 1967a) . Sapinda- ceae: Acer ( Okutani, 1967a) .

Remarks. On May 23, 2021, Shinohara found several dead females of this species on the trunks at the height of 1.5–2.5 m of dead trees of the above two newly recorded species standing on the broad riverbed of the Tone River in Koya (about 7 m), Moriya City, Ibaraki Prefecture. Apparently, those females (one of them in Fig. 1C ) died after oviposition as often observed for siricid females.

This is the first record of Alnus japonica ( Betulaceae ) and Juglans mandshurica var. sachalinensis ( Juglandaceae ) as hosts of Tremex apicalis . This woodwasp is now known to attack various broadleaved trees of eleven families.

Figures

Fig. 1. A, Late instar larva of Sterictiphora nipponica, 25. V. 2015, photographed by Ibuki. B, Phylloecus etorofensis, female, photographed by Hara. C, Dead female of Tremex apicalis on trunk of Alnus japonica, 23. V. 2021, photographed by Shinohara. D, Apethymus kunugi, female, photographed by Hara.