The Eumeninae (Hymenoptera, Vespidae) of Hong Kong (China), with description of two new species, two new synonymies and a key to the known taxa

Abstract

A total of 38 species belonging to 26 genera of Eumeninae are recorded from Hong Kong, among which two new species, namely Allorhynchium radiatumsp. nov. and Orientalicesa nigrasp. nov. are described and illustrated. Symmorphus tsushimanus Yamane, 1990 is newly recorded from China and its female is firstly described. Eighteen species are newly recorded for Hong Kong. Antepipona ferruginea Kim & Yamane, 2003 is synonymized with Antepipona rufescens (Smith, 1857) (syn. nov.) and Eumenes quadratus obsoletus Dover, 1926 is synonymised with Eumenes quadratus quadratus Smith, 1852 (syn. nov.). A checklist, a key and illustrations to Hong Kong Eumeninae are also provided.

Additions to the knowledge of the genus Allorhynchium van der Vecht, 1963 from China (Hymenoptera, Vespidae, Eumeninae)

“…Archancistrocerus diffinis Giordani Soika, 1986: 143- Notes. The species A. diffinis in the original description was identified on a single female from Sichuan, China (Giordani Soika 1986) and A. radiatum Li et al, 2019 was related to it. In this study, some more specimens of A. diffinis, including one male were also collected from Sichuan.…”

“…At present, Allorhynchium van der Vecht, 1963 contains 20 species and four subspecies worldwide, which are mostly distributed in the Oriental region (Smith 1861;Giordani Soika 1986;Girish Kumar et al 2016;Tan et al 2018;Li et al 2019). Tan et al (2018) revised the genus from Northeast Asia and provided a key to the Oriental species.…”

“…nov.). Meanwhile, seeing that the two related species A. diffinis (Giordani Soika, 1986) and A. radiatum Li, Barthélémy & Carpenter, 2019 were originally described on a single female specimen and confusing to distinguish, we provided some more morphological characters from both female and male and their COI (cytochrome oxidase subunit 1) sequence features. Finally, A. quadrimaculatum Gusenleitner, 1997 is newly recorded from China.…”

Taxonomy of the genus Epsilon from China, with a new species and an updated key to the Oriental species (Hymenoptera, Vespidae, Eumeninae)

“…( Diagnosis. Clypeus almost black, shallowly emarginated at apex, apical width about 1/3 of clypeal width; ocelli small, much less than distance between anterior and posterior ocelli; interocellar area with dense coarse punctures in female; parategula board basally; tergum II with punctures, interspaces between punctures generally greater than diameters, and with short apical lamella; figures as figs 68-70 in Li et al (2019 Remarks. Wickwar (1908) described this specimen as belonging to the genus Odynerus Latreille.…”

“…Odynerus xanthozonatus Williams 1928van der Vecht 1937: 290. Epsilon dyscherus Gusenleitner 1996Li et al 2019: 145, 147. 1♀, China, Hong Kong, Ping Shan Chai, hand net, 30.v.2015…”