Velvet ants

Definition

A family of solitary wasps (Mutillidae) whose wingless females are densely hairy, brightly colored, and ant-like in appearance. Despite their common name, they are not true ants (Formicidae) but rather a distinct lineage within Hymenoptera. The conspicuous aposematic coloration—typically scarlet, orange, black, or metallic—warns of a potent defensive sting. Males possess wings and are usually less hairy. The family comprises more than 7,000 described species, with greatest diversity in arid and tropical regions.

Etymology

From the dense, velvety pile of hair covering the body of females, combined with their superficial resemblance to ants.

Example

Dasymutilla occidentalis, the eastern velvet ant or 'cow killer,' is among the largest North American species; females actively search sandy soils for nests of ground-nesting bees and wasps to parasitize.

Synonyms

• mutillids

Related Terms

• aposematism
• müllerian mimicry
• solitary parasitoid
• Sexual dimorphism
• myrmecophagy
• Formicidae
• Hymenoptera

Usage Notes

The common name is a misnomer: velvet ants are wasps, not ants. The name 'cow killer' exaggerates sting potency—while intensely painful, the venom is less toxic than that of honey bees. Specialists reserve 'mutillid' for technical contexts. Identification relies heavily on female pilosity patterns and male wing venation.