Onthophagus (Colobonthophagus) Balthasar, 1963

Cheung, Kahong, Bai, Ming, Leung, Manhin, Lee, Yingming, Chan, Kinfung & Yang, Xingke, 2018, Scarabaeinae (Coleoptera: Scarabaeidae) from Hong Kong, Zoological Systematics 43 (3), pp. 233-267 : 248

Subg. Onthophagus (Colobonthophagus) Balthasar, 1963

Onthophagus ( Colobonthophagus) Balthasar, 1963 , Monogr. Scarab. Aphod. Palaearkt. Orient. Reg., 2: 164 ( Type species: Scarabaeus tragus Fabricius, 1792 ).

Key to species of Onthophagus ( Colobonthophagus) from Hong Kong.

1 Head with long lobe-like horn, the base of the horn greatly broadened; pronotum with strongly developed lobe-like horn pointing forward...................................................................................................... Onthophagus ( Colobonthophagus) lunatus Harold, 1868 Head without horn or with horn in different shapes; pronotum without horn ...................................................................................... 2

2 Head with a straight ridge; horn(s) not strongly developed and connected with the lobe-like ridge ...................................................... .......................................................................................................... Onthophagus ( Colobonthophagus) armatus Blanchard, 1853

Head with a curved ridge, horn(s) strongly developed and not connected with the ridge ...................................................................... ............................................................................................................... Onthophagus ( Colobonthophagus) tragus Fabricius, 1792