We have some new insects on the elephant food plant in the back yard.
The white insects are mealybugs. The two under the ant have just molted, shedding their waxy coats. Can you see the shed exoskeletons towards the lower end of the pile (they are open at the back)? Seems likely the mealybugs are most vulnerable right after molting.
Have you ever watched ants tending mealybugs?