Tarantula Hawk Wasp

Tarantula hawk wasps are large spider wasps in the genera Pepsis and Hemipepsis, named for their dramatic habit of hunting tarantulas. They are among the largest wasps, with some species reaching 5 cm in length, and are instantly recognizable by their dark iridescent bodies and bright orange or amber wings.

These wasps are found throughout the warmer regions of the Americas, especially in deserts and dry grasslands. The adults are actually gentle nectar-feeders that spend much of their time visiting flowers, particularly milkweeds. It is the females' reproductive behavior that gives them their fearsome reputation.

A female tarantula hawk seeks out a tarantula, paralyzes it with a sting, and drags the immobilized spider to a burrow. She lays a single egg on the spider, and the hatching larva consumes the living but helpless host, an extreme example of parasitoid strategy.

Look for these features:

• Very large body, often 3-5 cm long
• Blue-black or purplish iridescent body
• Bright rust-orange or amber wings
• Long legs with hooked claws for grappling spiders
• Curling antennae in females

Lookalikes include other spider wasps and large digger wasps, but the combination of huge size, dark metallic body, and orange wings is distinctive.

Tarantula hawks range across the southern United States, Mexico, Central America, and South America, with related species in other warm regions. They favor deserts, arid grasslands, and scrublands where tarantulas are common. Adults are frequently seen feeding at flowers during the day in warm months.

Adult tarantula hawks feed on flower nectar and are important pollinators, sometimes becoming sluggish after feeding on fermented nectar. Females hunt tarantulas, paralyze them with a sting, and provision a burrow with the living spider for their larva. Males patrol and perch on vegetation to find mates. This parasitoid relationship helps regulate tarantula populations.

Tarantula hawks undergo complete metamorphosis. After paralyzing a tarantula, the female drags it into a burrow and lays a single egg on its body. The larva hatches and feeds on the immobilized spider, saving vital organs for last so the host stays fresh. It then pupates within the burrow and emerges as an adult, typically producing one generation focused on the warm season.