Hyphasis sp or Hemipyxis sp
The flea beetle is a small, jumping beetle of the leaf beetle family, that makes up the tribe Alticini which is part of the subfamily Galerucinae. Historically the flea beetles were classified as their own subfamily. Wikipedia
Location: Kranji Rail Corridor – August 2021
Thanks, David Ball Singapore (SG) Insect ID and Records for the ID
