What is a Jerusalem cricket?

Jerusalem crickets (genus Stenopelmatus, family Stenopelmatidae) are large, flightless insects native to the American West and Mexico. Despite their common name, they are neither true crickets nor from Jerusalem — the name likely originated from a Spanish exclamation. They are also called 'potato bugs,' 'child of the earth' (nino de la tierra in Spanish), and 'skull insects.' Adults are 3–5 cm long with a large, bald, human-like head, powerful mandibles, and a striped abdomen. They are nocturnal and spend most of their lives underground.

Are Jerusalem crickets dangerous?

Jerusalem crickets are not venomous and are not medically significant. However, they can deliver a surprisingly painful bite with their powerful mandibles if handled or cornered — comparable to a hard pinch. The bite does not break skin in most cases but can cause bruising. They are not aggressive and will only bite as a last resort. They pose no threat to humans under normal circumstances.

Where do Jerusalem crickets live in Arizona?

Jerusalem crickets are found throughout Arizona in desert scrub, grassland, and suburban areas. They prefer loose, moist soil where they burrow and hunt. They are most commonly encountered after monsoon rains when they come to the surface, and during fall when they are most active. They are frequently found under rocks, logs, and debris, and occasionally enter homes through gaps in foundations.

What do Jerusalem crickets eat?

Jerusalem crickets are omnivores that eat decaying plant matter, roots, tubers, and other insects. They are not significant agricultural pests despite the 'potato bug' nickname — they rarely damage living plants. In gardens, they primarily eat decomposing organic matter and help with soil aeration. They will also eat other insects, making them minor predators in the soil ecosystem.

How do I keep Jerusalem crickets out of my home?

Jerusalem crickets enter homes through gaps in foundations, doors, and windows. Prevention measures: seal all foundation cracks and gaps around utility penetrations; install door sweeps; reduce moisture around the foundation (fix irrigation leaks, improve drainage); remove debris, wood piles, and rock piles near the house; and reduce outdoor lighting that attracts the insects they prey on. If found inside, they can be safely relocated outdoors.

What is a Jerusalem cricket?

Jerusalem crickets (genus Stenopelmatus, family Stenopelmatidae) are large, flightless insects native to the American West and Mexico. Despite their common name, they are neither true crickets nor from Jerusalem — the name likely originated from a Spanish exclamation. They are also called 'potato bugs,' 'child of the earth' (nino de la tierra in Spanish), and 'skull insects.' Adults are 3–5 cm long with a large, bald, human-like head, powerful mandibles, and a striped abdomen. They are nocturnal and spend most of their lives underground.

Are Jerusalem crickets dangerous?

Jerusalem crickets are not venomous and are not medically significant. However, they can deliver a surprisingly painful bite with their powerful mandibles if handled or cornered — comparable to a hard pinch. The bite does not break skin in most cases but can cause bruising. They are not aggressive and will only bite as a last resort. They pose no threat to humans under normal circumstances.

Where do Jerusalem crickets live in Arizona?

Jerusalem crickets are found throughout Arizona in desert scrub, grassland, and suburban areas. They prefer loose, moist soil where they burrow and hunt. They are most commonly encountered after monsoon rains when they come to the surface, and during fall when they are most active. They are frequently found under rocks, logs, and debris, and occasionally enter homes through gaps in foundations.

What do Jerusalem crickets eat?

Jerusalem crickets are omnivores that eat decaying plant matter, roots, tubers, and other insects. They are not significant agricultural pests despite the 'potato bug' nickname — they rarely damage living plants. In gardens, they primarily eat decomposing organic matter and help with soil aeration. They will also eat other insects, making them minor predators in the soil ecosystem.

How do I keep Jerusalem crickets out of my home?

Jerusalem crickets enter homes through gaps in foundations, doors, and windows. Prevention measures: seal all foundation cracks and gaps around utility penetrations; install door sweeps; reduce moisture around the foundation (fix irrigation leaks, improve drainage); remove debris, wood piles, and rock piles near the house; and reduce outdoor lighting that attracts the insects they prey on. If found inside, they can be safely relocated outdoors.

Jerusalem Crickets in Arizona — Identification, Behavior & What That Bite Feels Like

Back to Blog10 min readThroughout Arizona

Painful But Harmless

Jerusalem crickets can deliver a painful bite with their powerful mandibles but are not venomous and pose no medical risk to healthy adults.

Jerusalem crickets are among Arizona's most distinctive and misunderstood insects — large, bald-headed, and capable of a painful bite. Here's the complete guide to identifying and managing them.

Jerusalem crickets are large, flightless insects in the genus Stenopelmatus, family Stenopelmatidae. They are neither true crickets nor from Jerusalem. Arizona residents may hear them called potato bugs, niño de la tierra or “child of the earth,” and skull insects—a reference to their unusually large, bald, human-like head.

Jerusalem cricket quick ID

Size

3–5 cm

Nicknames

Potato Bug

Danger

Painful bite

Active

Monsoon season

Built for life below ground

Adults commonly measure 3–5 centimeters, with powerful mandibles, a broad head, and a boldly striped abdomen. They are nocturnal, fossorial insects that use loose soil and protected spaces beneath rocks, wood, or debris. Their omnivorous diet includes decaying organic material, roots and tubers, and other small insects, so they contribute to the soil food web rather than functioning as major crop pests.

Why monsoon weather brings them out

Summer monsoon moisture softens soil and raises surface activity, making these usually hidden insects more visible on patios, driveways, and near foundations. A cricket that enters a home is generally following moisture, shelter, or a gap at ground level—not seeking people. Do not pick one up: it can pinch hard when cornered, though it has no venom or medically important sting.

Keeping them outside

Seal foundation cracks and utility penetrations, add intact door sweeps, correct irrigation leaks, and keep mulch, boards, and debris from resting against the exterior. If one is indoors, guide it into a container with a stiff card and release it into a suitable outdoor area. These measures also help reduce entry by other desert insects.