Mesosa ( Perimesosa ) hyunchaei Yamasako & Hasegawa, 2009

Mesosa ( Perimesosa) hyunchaei Yamasako & Hasegawa, 2009 View in CoL ( Figs 6–9 View Figures 6–9 )

Mesosa ( Perimesosa) hyunchaei Yamasako & Hasegawa, 2009: 290 View in CoL , figs 1a–e, 2a–b. TL: S. Korea. TD: NSMT.

Material examined. Beijing: 1♂, Haidian, Yangtaishan , 21-VII-2020, leg. Xiaoran Yang ( CYXR) ; 1♀, Haidian, Dajuesihoushan , 10-VIII-2020, leg. Xiaoran Yang ( MYNU from CYXR) ; 1♀ ( Fig. 9 View Figures 6–9 ), Mentougou, Liyuanling , 11-VII-1997, leg. Baowen Sun ( IZCAS) ; 1♂ ( Figs 6–7 View Figures 6–9 ), Huairou, Fenshuiling , elev. 600m, 31-VII-2020, leg. Jian Sun, by light trap ( CSJ) ; 1♀, Huairou, Fenshuiling , elev. 538 m, 3-VIII-2022, leg. Jian Sun, by light trap ( CSJ) ; 1♂, Beijing, before 1990, leg. Weiwei Zhang ( CZWW) . Jiangsu: 1♂ ( Fig. 8 View Figures 6–9 ), Jurong, Baohuashan , 9-VII-2014, leg. Jianyue Qiu ( MYNU) .

Distribution. China ( Beijing, Jiangsu), S. Korea.

Host plant. Celtis sp. ( Ulmaceae ) (Yamasako & Hasegawa, 2009).

Remarks. This species was previously known only from S. Korea (Yamasako & Hasegawa, 2009). It is recorded from China for the first time ( Beijing and Jiangsu), indicating that it has wider distribution.

Yamasako & Hasegawa (2009) compared this species with M. ( P.) hirsuta distributed in Japan, Korea and Russian Far East. According to our study, it is also quite similar to M. ( P.) atrostigma Gressitt, 1942 by the elytral maculae, especially the middle part. However, it can be easily distinguished from each other by: a) presence ( atrostigma ) or absence ( hyunchaei ) of four black maculae on pronotum; b) absence ( atrostigma ) or presence ( hyunchaei ) of light color pubescent markings at basal part of elytra, around humeri.