This caterpillar was seen feeding on the young leaf an unknown plant (below). Its droppings on the leaf had led me to its location. According to a publication in 2012 [1], the host plant of this caterpillar is Baccaurea motleyana. However, the plant below did not look like Baccaurea motleyana. It might be Baccaurea racemosa or Baccaurea ramiflora, the other 2 host plants preferred by this species of moth.

Reference:

[1] Leong TM. Final instar caterpillars and metamorphosis of Cyclosia sordidus (Walker) in Singapore (Lepidoptera: Zygaenidae: Chalcosiinae). Nature in Singapore 2012;5:151-158. | Read article |