Strumigenys sydorata Bolton, 2000

Tang, Kit Lam, Pierce, Mac P. & Guenard, Benoit, 2019, Review of the genus Strumigenys (Hymenoptera, Formicidae, Myrmicinae) in Hong Kong with the description of three new species and the addition of five native and four introduced species records, ZooKeys 831, pp. 1-48 : 38

Strumigenys sydorata Bolton, 2000 - new record Fig. 8 D–F

Strumigenys sydorata Bolton 2000: 876 (w. q.) JAVA. Indomalaya.

Material examined.

HONG KONG: North District, Kuk Po San Uk, 22.52912N, 114.23468E, 15.11.2016, R.H. Lee, Winkler, IBBL; Sha Tin District, Tai Po Kau, 22.42614N, 114.18178E, 162 m, 06.07.2017, R.H. Lee, pitfall trap, IBBL; Tai Po District, Sha Lo Tong, 22.481767N, 114.18283E, 28.05.2015, R.H. Lee, Winkler, IBBL; Tai Po District, Tai Om, 22.4419N, 114.1335E, 76 m, 05.10.2016, Winkler, IBBL; Tai Po District, Tai Om, 22.4423N, 114.1343E, 81 m, 07.08.2015, T. Tsang, Winkler, IBBL.

Measurements.

Worker (n = 1): TL 2.5, HL 0.69, HW 0.53, MandL 0.19, SL 0.28, EL 0.059, PW 0.30, ML 0.66, PL 0.24, PH 0.17, DPW 0.15, PPL 0.16, GL 0.52, CI 77, MI 28, SI 53, OI 11, LPI 70, DPI 62.

Geographic range.

China (Hong Kong), Indonesia (Java), Thailand, Vietnam.

Ecology.

This is a rare species in Hong Kong collected only within secondary forests and Feng Shui woods (Fig. 10). Elevations of collection sites ranged from 15 to 170 m.

Comments.

This new record from Hong Kong represents another important geographic extension of 900 km north-eastward in Mainland Asia, with the closest record known from Cúc Phương in Vietnam ( Eguchi et al. 2011). Strumigenys sydorata belongs to the lyroessa-complex within the S. lyroessa -group. This species can be separated from others in this group by the presence of pronotal humeral hairs, a smooth first gastral tergite, a well-developed lamella along the propodeal declivity, and a larger preapical tooth when compared to the apicodorsal tooth on mandibles. The latter character separates it from S. arrogantia , which is slightly smaller than S. sydorata .