Exocentrus alboguttatus subconjunctus Gressitt, 1940

Lin, Mei-Ying, Perissinotto, Renzo & Clennell, Lynette, 2021, Census of the longhorn beetles (Coleoptera, Cerambycidae and Vesperidae) of the Macau SAR, China, ZooKeys 1049, pp. 79-161 : 79

Exocentrus alboguttatus subconjunctus Gressitt, 1940

Fig. 37

Exocentrus alboguttatus subconjunctus Gressitt, 1940a: 184. TL: China (Hainan); TD: SYSU

Distribution.

Palaearctic Region: China (Guangxi, Hainan, Hong Kong) ( Yiu 2009; Lin and Yang 2019; Danilevsky 2020).

Macau records.

Great Taipa, 29 Apr 2019, at light in ablution block, R Perissinotto & L Clennell (IZCAS); ibidem 9 May 2019, R Perissinotto & L Clennell (IZCAS); ibidem 15 May 2019 on dead tree branch, R Perissinotto & L Clennell (IZCAS); ibidem 13 Jun 2019, on mosquito trap, R Perissinotto & L Clennell (IZCAS); Little Taipa, 26 Apr 2019, at monument spotlight, R Perissinotto & L Clennell (IZCAS); Coloane Village, 2 Jun 2019, on floor in ablution block (MACT); ibidem 13 May 2020, R Perissinotto & L Clennell (MACT, × 2); ibidem 8 Jun 2020, R Perissinotto & L Clennell (IZCAS); St. Francis Xavier’s Parish [Coloane], 24 May 2020 2:08, Kit Chang (https://www.inaturalist.org/observations/47082171); ibidem 24 May 2020 19:32, Kisu Wong, (https://www.inaturalist.org/observations/54388816); ibidem 30 Apr 2021, Lynette Clennell (https://www.inaturalist.org/observations/76032774); Taipa, Evora Str., 6 Jun 2020 1:38, Eric Kwan (https://www.inaturalist.org/observations/48558660); Our Lady of Carmel’s Parish [Great Taipa], 28 May 2020 00:37, Kit Chang (https://www.inaturalist.org/observations/47611059).

Remarks.

In Macau, adults are active from late spring till early summer and range in total length 4.5-7.5 mm and 1.5-3 mm in maximum width. They are readily attracted to artificial lights at night, but are also active during daytime when they can be observed crawling and mating on dead tree twigs and branches. In nearby Hong Kong, where in the past this species has been erroneously reported as E. guttulatus subconjunctus , the larval host plants include Acacia farnesiana , Mallotus spp. and Morus alba ( Yiu 2009; Yiu and Yip 2011).

Figures

Figure 37. Exocentrus alboguttatus subconjunctus Gressitt, 1940: dorsal (A) and lateral (B) views of specimens observed on Great Taipa Hill (3 Jun 2018) and Coloane Village (25 May 2020), respectively (photographs: LC).