Eustra chinensis Baenninger , 1949

Song, Xiao-Bin, Tang, Liang & Peng, Zhong, 2018, Flanged Bombardier beetles from Shanghai, China, with description of a new species in the genus Eustra Schmidt-Goebel (Coleoptera, Carabidae, Paussinae), ZooKeys 740, pp. 45-57 : 49-51

Eustra chinensis Baenninger, 1949 Figs 1B, 6B 中华双斑粗角步甲

Eustra chinensis Bänninger, 1949: 134 (original description, type locality: Shanghai, China); Deuve 2001: 570 (diagnosis, new record from Taiwan, China); Teradaet al. 2013: 31 (redescription); Maruyama et al. 2013: 2 (associated with Ectomomyrmes javana ).

Material examined.

1♂, 1♀, (cSXB), labeled 'CHINA: Shanghai, Xuhui District, Shanghai Normal University (上海师范大学), 31°09'48"N, 121°24'45"E, alt. 4 m, 11.V.2017, Xiao-Bin Song leg., [from colony of Ectomomyrmes javana ]'; 1♂, 1 ex, (cSXB), ditto, but 20.ix.2016, Zhong Peng leg.; 1 ex, (cJRX), ditto; 1 ex, (cSXB), labeled 'CHINA: Shanghai, Changning District, Zhongshan Park (中山公园), 31°13'25"N, 121°25'00"E, alt. 9 m, xi.2006, Xiao-Bin Song leg.'

Other material examined.

Zhejiang: 1ex, (cSXB), labeled 'CHINA: Zhejiang, Hangzhou City, Lin’an District, West Tianmushan (西天目山), 30°19'28"N, 119°26'54"E, alt. 380 m, 16. vii– 9.viii.2017, Xiao-Bin Song leg., [F. I. T.].'

Comments.

Eustra chinensis is characterized by the large body size and the broad elytra. This is the only known myrmecophilous species of the genus Eustra . Adults are collected from Ectomomyrmes javana (Mayr, 1867) nests under the stone (Fig. 6B), and have been observed feeding on dead insects inside nest of E. javana (Maruyama et al., 2013). Wendy et al. (2011) described an unidentified Eustra larva which collected during the excavation of nest of Ectomomyrmes javana in Taiwan, based on its same special symbiotic host and the reasonable distribution, the larva should belongs to Eustra chinensis .

Measurements.

BL, 4.03-4.30; HW, 0.94-0.96; PL, 0.65-0.68; PW, 1.21-1.25; EL, 2.32-2.61.

Distribution.

China: Shanghai, Zhejiang (new provincial record), Taiwan; Japan: Yaeyama-shoto.

Symbiotic host.

Ectomomyrmes javana (Mayr, 1867) (Figs 6B, 7A, B).