1	Frons with a distinct transverse carina present in front of anterior ocellus in both sexes (a); head dark in female (b)	C. nipponensis Uchida, 1933
–	Frons without transverse carina, at most with distinct transverse ridge present in males (aa), but often with more or less denser punctate depression before a relatively higher area in both sexes (aaa); head with more or less yellow areas (bb)	2
2	Frons with a distinct transverse ridge in male (a); pronotum in both sexes yellow laterally (b); T3 and sometimes also T4 in female yellow laterally (c), male metasoma wholly black	C. yunnanensis (Betrem, 1941)
–	Frons without distinct transverse ridge in male, often replaced by a more or less denser punctate depression (aa); pronotum in both sexes black laterally (rarely with small round yellow spot anteriorly in female); T3 of both sexes often with pale yellow lateral spot (cc)	C. vittifrons (Sichel, 1864)