I also have those caterpillars on my home-grown Hibiscus plants, which are located in three separate garden locations.
The caterpillars are very small, hairless and very nearly "see-through". They are voracious.
What are the eggs like?
What are the pupae like?
What are the adults like?
I need to get at these creatures in all of their stages because just squishing the caterpillars cannot be enough.
Does anyone have pictures of these other stages to help me and other people who are threatened by these pests?