Serratobicon scutatus scutatus: widespread in Thailand (Saraburi) and Sumatra! No problem for the author for this strange distribution
Serratobicon scutatus sabahensis: Borneo.
Differences (according to the author): - the red colour does not reach the elytral half (but colour is variable!) - the almost regularly rounded pronotal disk with a bit stronger and more evident punctures. Author's remark: the two paratypes show different pronotal proportions (!)
Serratobicon scutatus scutatus (b/n) and sabahensis, females (colour)
Holzschuh (2019) has just synonymised Serratobicon scutatus sabahensis with Serratobicon nigriceps (Aurivillius, 1925)