The brown widow (Latrodectus geometricus) is an invasive widow spider that has spread rapidly across the American Southwest, including Arizona, over the past two decades. It is closely related to the western black widow but is tan to brown in color with a distinctive orange or yellow hourglass marking on the underside of the abdomen. The egg sacs are distinctive — spiky and tufted, unlike the smooth egg sacs of the black widow. Brown widows are smaller than black widows and their venom, while containing the same neurotoxin, is considered less potent due to the smaller amount injected. They prefer sheltered, protected locations in and around structures: under outdoor furniture, in rolled-up tarps, in potted plants, under eaves, and in cluttered garages. Brown widows are displacing black widows in many urban Arizona locations.
👁Warning Signs
Tan to brown spider with orange hourglass under the abdomen. Distinctive spiky, tufted egg sacs in sheltered locations. Irregular webs under outdoor furniture, in potted plants, or in garage corners.
⚠Health & Property Risks
Venom is neurotoxic but generally less severe than the western black widow. Bite causes localized pain and may cause mild systemic symptoms. Seek medical attention for bites in children or sensitive individuals.
Prevention Tips
Inspect outdoor furniture, potted plants, and stored items before handling. Wear gloves when working in garages or outdoor storage. Seal gaps in outdoor structures.
🛡Professional Treatment
Targeted residual treatments, web and egg sac removal, and perimeter applications around outdoor structures.
Frequently Asked Questions — Brown Widow
The Brown Widow (Latrodectus geometricus) is tan to brown with orange or yellow hourglass on abdomen underside; banded legs and typically measures ~1/3–1/2 inch body. The brown widow (Latrodectus geometricus) is an invasive widow spider that has spread rapidly across the American Southwest, including Arizona, over the past two decades. It is closely related to the.
The Brown Widow poses a moderate risk. Venom is neurotoxic but generally less severe than the western black widow. Bite causes localized pain and may cause mild systemic symptoms. Seek medical attention for bites in children or sensitive individuals.
In Arizona, brown widows are most often encountered in the following situations: Tan to brown spider with orange hourglass under the abdomen. Distinctive spiky, tufted egg sacs in sheltered locations. Irregular webs under outdoor furniture, in potted plants, or in garage corners.
The Brown Widow is most active during: Year-round; most active in warm months. Arizona's warm desert climate can extend activity periods compared to other states, so year-round vigilance is recommended in the Phoenix metro and surrounding areas.
Inspect outdoor furniture, potted plants, and stored items before handling. Wear gloves when working in garages or outdoor storage. Seal gaps in outdoor structures.
Targeted residual treatments, web and egg sac removal, and perimeter applications around outdoor structures.
If you spot a Brown Widow indoors, avoid handling it directly. Capture it under a glass if possible for identification, or photograph it for reference. Contact Pest Control Bros for a professional inspection — we can confirm the species, assess the severity of the infestation, and recommend targeted treatment.
Dealing with Brown Widow?
Pest Control Bros LLC serves Maricopa, Chandler, Casa Grande, Tempe, Gilbert, and Mesa. No contracts. Free inspections. Same-week service.
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