Ant Lion

🔬

PestControlBasics Editorial Team

Reviewed by Derek Giordano · Updated 2026

Illustrated identification guide — PestControlBasics.com

🔍 Identification

Larvae: 10-15mm; oval, flattened body; large sickle-shaped mandibles; walk backward; camouflaged in sand at the base of conical pits. Adults (often called 'doodlebugs' as larvae): resemble damselflies; weak fliers; nocturnal; attracted to lights. Conical pits: 1-5cm diameter, in dry protected sandy areas (under eaves, dry sandy soil, dry exposed soil under decks).

🧬 Biology & Behavior

Ant lion larvae excavate conical traps in loose dry sand by flicking sand grains outward with their head. Ants and other insects that slip into the cone slide to the bottom where the larva seizes them with its mandibles. The larva can live 1-3 years before pupating and emerging as a flying adult. They're found throughout the US in sandy habitats.

⚠️ Damage & Health Risk

Zero negative impact. Entirely beneficial predators of ants and small insects. Their conical pits are aesthetically interesting rather than damaging.

🔧 DIY Treatment

No treatment warranted — ant lions are beneficial. The conical pits indicate good sandy habitat. They naturally disappear when the soil is disturbed or becomes moist.

👷 When to Call a Pro

Never warranted for ant lions.

❓ FAQ

Are ant lion pits dangerous?

No — ant lions are completely harmless to humans and pets. The pits are too small to pose any hazard. The mandibles can barely be felt by adult humans and are not medically significant.

Why do I have so many ant lion pits?

Large numbers of ant lion pits indicate abundant prey (ants) and suitable sandy, dry, protected soil conditions — typically under roof overhangs, in dry flower beds, or under decks. They're a sign of active prey populations and healthy soil ecology, not a pest problem.

Factor	Details
U.S. Range	All 50 states
Regional Detail	Fire ants limited to Southeast/Southwest. Carpenter ants: Northeast and Pacific Northwest. Pavement ants: nationwide. Argentine ants: California and South.

Factor

Details

U.S. Range

All 50 states

Regional Detail

Fire ants limited to Southeast/Southwest. Carpenter ants: Northeast and Pacific Northwest. Pavement ants: nationwide. Argentine ants: California and South.

📅 Treatment Timing Guide

Treating at the right time dramatically improves results. Pest control timed to the life cycle uses less product and achieves better long-term control.

Period	Action
February–March	Apply perimeter treatment before spring colonies emerge.
June–August	Peak foraging season — bait stations most effective now.
September	Pre-winter perimeter treatment to prevent fall invasions.

Period

Action

February–March

Apply perimeter treatment before spring colonies emerge.

June–August

Peak foraging season — bait stations most effective now.

September

Pre-winter perimeter treatment to prevent fall invasions.

💰 Professional Treatment Costs

Service Type	DIY Cost	Professional Cost
Initial inspection	Free (self-inspect)	$75–$150 (often credited to treatment)
One-time treatment	$30–$100 in materials	$150–$500
Annual service contract	N/A	$400–$900/year
Severe infestation	Often ineffective alone	$500–$2,500+

Service Type

DIY Cost

Professional Cost

Initial inspection

Free (self-inspect)

$75–$150 (often credited to treatment)

One-time treatment

$30–$100 in materials

$150–$500

Annual service contract

N/A

$400–$900/year

Severe infestation

Often ineffective alone

$500–$2,500+

Prices vary by region, property size, and infestation severity.

❓ Common Questions About 🐛 Ant Lion

How do I confirm I actually have this pest (not something similar)?

The most reliable confirmation is a physical specimen — capture one and compare to reference images on this page. For cryptic pests (bed bugs, termites), look for secondary signs: frass, shed skins, mud tubes, or bites with a specific pattern. When uncertain, a professional inspection is faster than months of misidentification.

Can I treat this myself or do I need a professional?

DIY is effective for small, accessible infestations caught early. Professionals are worth the cost when: the infestation is inside wall voids or structural elements, multiple rooms are affected, you have health-risk pests (hantavirus, venomous species), or DIY has already failed twice.

How long until the infestation is completely gone?

Expect 3–8 weeks for most infestations with proper treatment. Insects with dormant life stages (pupae, eggs) extend the timeline because those stages are impervious to most insecticides. Follow-up treatments at 2 and 4 weeks catch each new cohort as they emerge.

What's the most common mistake people make treating this pest?

Treating only the visible pest population while ignoring the harborage site, entry point, or breeding location. Killing adults provides temporary relief but the population rebuilds from hidden egg cases, pupae, or new arrivals through unaddressed entry points.

🐛 Ant Lion