Chelidonium argentatum (Dalman, 1817)

Fig. 7

Cerambyx argentatus Dalman, 1817: 151. TL: Unknown; TD: NHRS

Distribution.

Palaearctic Region: China (Anhui, Chongqing, Fujian, Gansu, Guangdong, Guangxi, Hainan, Henan, Hong Kong, Hubei, Hunan, Jiangsu, Jiangxi, Ningxia, Sichuan, Shaanxi, Taiwan, Yunnan, Zhejiang); India (Sikkim) (Yiu 2009; Lin and Yang 2019; Danilevsky 2020). Oriental Region: India; Laos; Myanmar; Sri Lanka; Vietnam (Kariyanna et al. 2017).

Macau records.

Taipa, University of East Asia Campus, 28 May 1992, on wall of Tai Fung building and 30 May 1992 outside classroom CLG 401, " Chelidonium sinense (Hope)" (Easton 1992: 35; Easton 1993: 47); Coloane, 30 May 2000, ML Lei (CIAM); Coloane, Cheoc-Van, 15 May 2019, on coastal vegetation, R Perissinotto; Coloane Heights, 22 May 2019, dead on path, R Perissinotto (IZCAS); ibidem 17 Jun 2020, on flowers of Acronychia pedunculata, R Perissinotto; ibidem 29 Jun 2020, R Perissinotto & L Clennell; Coloane Village, 22 May 2020, on flowers of Psychotria serpens, R Perissinotto (IZCAS); Coloane, Ká-Hó coast, 26 May 2020, on flowers of Syzigium buxifolium, R Perissinotto (MACT); ibidem 3 Jun 2020, R Perissinotto; Estrada do Alto de Coloane, 2 May 2021 9:45, jbsandsmacau (https://www.inaturalist.org/observations/77236125); St. Francis Xavier’s Parish [Coloane], 5 May 2021, Lynette Clennell (https://www.inaturalist.org/observations/77700701).

Remarks.

The size of this species in Macau ranges 24-31 mm in total length and 5-7 mm in maximum width. Adults are active during the hottest part of the day during May-June and have been observed while feeding on flowers of Acronychia pedunculata, Psychotria serpens, Dalbergia benthamii, and Syzigium buxifolium (RP pers. obs.). In nearby Hong Kong, larvae of this species have been recorded boring into the wood of citrus plants (Yiu 2009). More specifically, host plants include Citrus aurantifolia, C. aurantium, C. limonia, C. microcarpa, C. reticulata and Fortunella margarita (Duffy 1968; Makihara et al. 2008).