Syncosmetus Sharp, 1891

Mo, Da-Rui & Xu, Ji-Shan, 2022, Two new species of the tribe Xylographellini (Coleoptera: Ciidae) from Yunnan Province, China, Zootaxa 5219 (3), pp. 295-300 : 296

Key to Chinese transition zone and Oriental species of Syncosmetus Sharp, 1891 (adults)

Updated from Lopes-Andrade (2008) and Lopes-Andrade & Grebennikov (2015)

1 Body elongate; elytra with longitudinal keels weak.................................... Sy. reticulatus Miyatake, 1985

- Body rounded; elytra with longitudinal keels prominent....................................................... 2

2 Pronotum with sides broad, visible for their entire lengths from above........................................... 3

- Pronotum with sides narrow, partly visible their lengths from above............................................. 5

3 Each elytron first and second keels united at their base, second and third keels not united at their apices................................................................................................. Sy. japonicus Sharp, 1891

- Each elytron first and second keels not united at their base, second and third keels united or not united at their apices...... 4

4 Each elytron second and third keels not united at their apices............. Sy. euryale Lopes-Andrade & Grebennikov, 2015

- Each elytron second and third keels united at their apices............... Sy. perseus Lopes-Andrade & Grebennikov, 2015

5 Pronotum with longitudinal sulcus at midline; each elytron first and second keels not united at their base, second and third keels not united at their apices................................................................................ 6

- Pronotum without longitudinal sulcus at midline; each elytron first and second keels united at their base, second and third keels united at their apices................................................................ Sy. wuliangensis sp. nov.

6 Pronotum with broad longitudinal sulcus at midline, lateral edges usually broad................................................................................................. Sy. medusa Lopes-Andrade & Grebennikov, 2015

- Pronotum with narrow longitudinal sulcus at midline, lateral edges usually narrow............................................................................................... Sy. stheno Lopes-Andrade & Grebennikov, 2015