Insects diurnal

Steel-blue Cricket-hunter Wasp

Chlorion aerarium

A shimmering jewel of the garden, the Steel-blue Cricket-hunter is a master of pest control and one of the most striking solitary wasps you'll ever encounter.

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Quick Identification

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Size

20–30 mm (0.8–1.2 inches) in length

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Colors

Brilliant iridescent metallic steel-blue to blue-green; wings are also tinted with a dark smoky blue-violet sheen.

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Key Features

Extremely thin 'thread-waist' petiole
Overall metallic blue or blue-green coloration
Large, dark compound eyes
Rapidly vibrating or flicking wings while moving on the ground

When You’ll See Them

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Activity pattern diurnal

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Peak hours 10 AM - 4 PM

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Season July-September

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Diet Adults are pollinators that drink nectar from various flowers. However, the larvae are carnivorous, feeding exclusively on crickets (such as field crickets or snowy tree crickets) provided by the mother.

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Habitat Open, sunny areas including suburban backyards, flower gardens, and meadows, particularly those with patches of bare, sandy soil for nesting.

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Behavior

Despite their intimidating appearance, Steel-blue Cricket-hunters are solitary wasps, meaning they don't have a hive to protect and are remarkably docile toward humans. You’ll often spot them frantically exploring the ground or garden foliage. Unlike social wasps, the female is a lone architect and provider, spending her summer days excavating deep burrows in sandy soil where she will eventually house her offspring.

Their hunting behavior is a marvel of nature. A female will track down a cricket, paralyze it with a precision sting to the nervous system, and then drag the heavy prize back to her burrow. Because they are solitary, they are not aggressive; they would much rather spend their energy hunting garden pests than bothering people, making them excellent, low-maintenance neighbors for any backyard gardener.

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Camera Tips

To capture these fast-moving gems on camera, focus your efforts on 'resource hotspots.' Look for patches of bare, loose soil near flower beds—this is where females are likely to dig their burrows. If you find a small hole about the diameter of a nickel with a pile of fresh dirt nearby, set your camera at a low angle (about 2-4 inches off the ground) focused right on the entrance. Because these wasps move quickly, use a high shutter speed or a 'burst' photo mode to catch them as they drag crickets into the hole.

If you aren't finding burrows, target their fuel source. Plant native late-summer bloomers like Goldenrod, Rattlesnake Master, or Milkweed. Place your AI camera within 12-18 inches of the flower heads. For the best color payoff, ensure the camera is positioned so the sun is behind it; the direct light will make the wasp's metallic blue exoskeleton pop with a vibrant shimmer that looks incredible in high-definition video.

Since these wasps are relatively small, a macro lens attachment or a camera with a short minimum focus distance is essential. If your camera supports it, enable 'high sensitivity' motion triggering, as the quick, jerky movements of a wasp can sometimes be missed by standard PIR sensors. Mid-day is the best time for filming, as they require the heat of the sun to reach peak activity levels.

Similar Species

Species that look similar or are commonly confused with Steel-blue Cricket-hunter Wasp.

Blue Mud Dauber

Smaller in size and typically found around porch ceilings or eaves, using mud nests rather than underground burrows.

Great Black Wasp

Similar shape and behavior, but entirely matte black without the bright metallic blue shimmer.

Frequently Asked Questions

These wasps are highly diurnal and heat-loving. You will most likely see them active during the hottest part of the day, typically between 10 AM and 4 PM, when the sun is brightest.

The best way to attract them is to plant nectar-rich native flowers like mountain mint and goldenrod. Additionally, leaving some patches of bare, sandy soil allows the females to dig their nesting burrows.

Adults eat nectar and pollen from flowers. However, they hunt crickets to provide food for their young. The female paralyzes the cricket and places it in her burrow for her larvae to eat after they hatch.

Yes, they are very common in suburban environments across North America, especially in gardens that provide both flowers for the adults and a healthy population of crickets for their larvae.

While both are metallic blue, the Steel-blue Cricket-hunter (Chlorion aerarium) is generally larger and builds nests in the ground. The Blue Mud Dauber (Chalybion californicum) is slightly smaller and is usually seen around buildings, where it 'reoccupies' the mud nests of other wasps.

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