I spotted this group of tiny bugs under a hibiscus leaf a week ago and closer examination revealed that they were just hatched: the whitish membranes underneath the middle of the group are their flaccid eggshells.
They are Pentatomidae – Shield Bugs or Stink Bugs, depending on how polite you want to be – but it isn’t possible to identify them to species level without either patience (i.e. waiting for them to grow up) or DNA analysis. My best guess is a Poecilometis species like this one.
Here’s an earlier article about another similar species: