Key to species (males) of the genus Celopsis

1 Process of dorsal connective not branched.................................................................. 2

- Process of dorsal connective bifurcated.................................................................... 3

2 Body coloration olive brown; pygofer lobe with two spines............................................ C. dapitana

- Body coloration brown; pygofer lobe with comb like spines bearing 5 to 9 teeth........................... C. pectinata

3 Process of dorsal connective distinctly bifurcated; aedeagal shaft with a lateral lamellate process............... C. undata

- Process of dorsal connective slightly bifurcated; aedeagal shaft with no lateral process............. C. yaeyamana sp. nov.