I'm not exactly sure of the specific species, but their are three kinds of ladybugs. The red ladybugs, the yellow ladybugs, and the orange lady bugs. The red ladybugs are harmless but the yellow and orange could be poisonous.
Ants will eat ladybugs, all the ladybugs..while ladybugs are eating afids the ant is eating ladybugs, because the ants somewhat farm the afids for the afids leave droppings that are a food source to ants. So the ant will protect the afids.