Taxonomic Notes and New Distribution and Host Plant Records for Sawflies and Woodwasps (Hymenoptera, Symphyta) of Japan VIII Author Kumar, Deepthi S Author Sankar, Manimuthu M text Bulletin of the National Museum of Nature and Science. Series A, Zoology 2023 2023-05-22 49 2 57 74 http://dx.doi.org/10.4103/jpbs.jpbs_546_23 journal article 303592 10.50826/bnmnszool.49.2_57 90b4626e-63df-4241-a3cd-abe4d57452d2 2434-091X 13826588 Perineura okutanii Takeuchi, 1959 Japanese name: Ajisai-habachi ( Fig. 10 ) Larva . Late instar ( Fig. 10A–B ): Head pale olive, with large black spot around stemmatum; trunk pale greenish, with sparse minute whitish tubercles dorsally. Material examined . HONSHU: Tochigi Pref. : 2 $ ( Fig. 10C ), Nakagawa, Oyamada, coll. larvae on Hydrangea macrophylla f. macrophylla , 31. V . 2016 , mat. 5. VI ., em. 11. IV. 2017 , S. Ibuki. Host plants . Hydrangeaceae : Hydrangea hortensia (= Hydrangea macrophylla (Thunb.) Ser. f. hortensia (Lam.) Rehder ) ( Takeuchi, 1949 ); Hydrangea macrophylla Seringe (= Hydrangea macrophylla (Thunb.) Ser. f. normalis (E.H.Wilson) H.Hara) ( Okutani, 1967 ); Hydrangea macrophylla (Thunb.) Ser. f. macrophylla (new record). Takeuchi (1959) noted lLarva feeds on Hydrangea spp. z. Life history . Ibuki found two late instar larvae solitarily feeding on Hydrangea macrophylla f. macrophylla on May 31, 2016 , in Nakagawa, Tochigi Prefecture . The larvae were not coiled at rest. They matured on June 5 and entered the soil. Two female adults emerged on April 11, 2017 . This species is regarded as univoltine. Remarks . As suggested by Takeuchi (1959) , this species is thought to be the sawfly long known in Japan as lAjisai-habachiz (=hydrangea sawfly) ( Sasaki, 1923 ), a pest of hydrangea. Sasaki (1923) gave concise notes on the morphology, life history and damage of this species. His description of the late-instar (lmaturez) larva differs from the larva shown in Fig. 10A–B in the head coloration. According to Sasaki (1923) , the head of the larva is black, whereas the head is pale olive in our material. We need more information to confirm if this difference is within a variation range of the species.