Syndicus

Zhou, De-Yao & Yin, Zi-Wei, 2017, New data on the genus Syndicus Motschulsky (Coleoptera: Staphylinidae: Scydmaeninae) from Yunnan, southern China, Zootaxa 4247 (5), pp. 569-576 : 575

Key to Syndicus species of China

1 Base of antennomere XI nearly as broad as apex of antennomere X; antennomere XI shorter than half length of antennomere X (subgenus Syndicus )................................................................................... 2

- Base of antennomere XI much narrower than apex of X; antennomere XI longer than half length of antennomere X (subgenus Semisyndicus )....................................................................................... 4

2 Body length exceeding 4 mm ( Yin et al. 2014: fig. 1). (Zhejiang, Fujian, Hunan, Guangdong).............. S. jaloszynskii

- Body length less than 4 mm ............................................................................ 3

3 Body length less than 2.7 mm, each elytron with marginal impression on sides of elytra ( Yin & Zhou 2015: figs 1A, 4A). (Hainan)...................................................................................... S. qiong

- Body length no less than 2.9 mm, each elytron lacking marginal impression. (Yunnan).................. S. himalayanus

4 Pronotal disc glossy, without well-marked punctures ( Yin & Li 2015: fig. 1B). (Hainan).................. S. hainanicus

- Pronotal disc with coarse, sharply marked punctures........................................................ 5

5 Body length less than 2.5 mm ( Yin & Li 2015: fig. 1A). (Hainan)................................ S. grossepunctatus

- Body length exceeding 2.5 mm ......................................................................... 6

6 Pronotal disc relatively sparsely punctate ( Yin & Zhou 2016: fig. 5A). (Yunnan).......................... S. sinensis

- Pronotal disc relatively densely punctate ( Fig. 5A ; Yin & Zhou 2016: fig. 5D).................................... 7

7 Body length 3.21 mm, endophallus with a C-sharped sclerite ( Fig. 4 B). (Yunnan)........................ S. long sp. n.

- Body length 3.02–3.05 mm, endophallus without a C-shaped sclerite ( Jałoszyński 2008: fig. 3). (Sichuan)... S. sichuanicus

Figures

FIGURE 4. Male diagnostic features of Syndicus long. A. Aedeagus, in ventral view. B. Same, in lateral view. C. Same, in dorsal view. D. Endophallus, in ventral view. E. Same, schematic. F. Apical portion of paramere, enlarged. G. Right antenna.

FIGURE 5. A. Head and pronotum of Syndicus long. B – C. Habitat of S. himalayanus in Yunnan: Nabang Town, photography by Fang-Ling Qiu.