Key to species of Sinosticta Wilson

1 Antehumeral stripe complete, as long as mesothoracic pleural suture ......................................................................... 2

- Antehumeral stripe incomplete, only half as long as mesothoracic pleural suture.......................................... S. ogatai

2 Postocular spots present, lateral synthorax mainly pale ............................................................................................... 3

- Postocular spots absent, lateral synthorax mainly black.......................................................................... S. hainanense

3 A pair of large oval, pale spots on frons (Fig. 7); apex of cerci acute and lacking subdistal inner horns, cerci slightly longer than paraprocts (Figs. 4–5). .............................................................................................................. S. sylvatica

- No pale spots on frons; apex of cerci not acute and having subdistal inner horns, cerci shorter than paraprocts.......... .......................................................................................................................................................................... S. debra