Key to species of Yunnantettix

1. External lateral carina of pronotum above the tegmen strongly curved upward, arch-like (fig. 1, 2). Apex of posterior pronotal process with shallow excision. ........................................ Yunnantettix thaicus sp. n.

— External carina of pronotum above the tegmen only slightly curved upward or almost straight (fig. 16, 18). Apex of posterior pronotal process with deep excision or rounded (fig. 17, 19). .............................. 2

2. Apex of posterior pronotal process with deep excision (fig. 17). ........................................... Y. bannaensis

— Apex of posterior pronotal process rounded (fig. 19). ................................................................ Y. elytratus