Major Hymenoptera subgroups are Apids (eg, honeybees, bumblebees) Vespids (eg, wasps, yellow jackets, hornets) Formicids (eg, nonwinged fire ants) Apids usually do not sting unless provoked; however, Africanized honeybees (killer bees), migrants from South America that reside in some southern and southwestern US states, are especially aggressive when agitated.