Brown Widow Spider, Grey Widow, Brown Button Spider
Latrodectus geometricus
Family Theridiidae (Cobweb Spiders), Order Araneae. Characterized by building tangled three-dimensional webs and having a comb of serrated bristles on the fourth leg tarsus.
Physical Description
Small to medium cobweb spider with a globose (rounded) abdomen in females; males are significantly smaller. They possess a cephalothorax that is typically lighter than the abdomen. This specimen shows a characteristically mottled or tan appearance compared to its black widow cousins.
Size Estimate
Female body length 7–10 mm (excluding legs); leg span approx. 25–40 mm. This appears to be an adult or sub-adult female. Males are much smaller, around 2-4 mm.
Coloration & Markings
Tan or brown base color with distinctive cream-colored mottled patterns on the sides of the abdomen. On the underside, they possess an hourglass marking that is typically orange to yellowish-orange, rather than the bright red of a Black Widow.
Web Type
Tangle web or cobweb. A messy, non-symmetrical three-dimensional structure of very strong silk. Often includes a central retreat or 'funnel-like' hiding spot in a corner.
Eye Arrangement
8 eyes in two rows of four, though typically difficult to see without magnification. The lateral eyes are separated, which is a diagnostic feature for the genus Latrodectus.
Leg Characteristics
Long, slender legs with dark banding at the joints. The fourth pair of legs features a 'comb' of bristles used to wrap prey in silk.
Venom & Safety Information
Venom Information
Contains latrotoxin, which is a neurotoxin. While technically more potent drop-for-drop than Black Widow venom, the Brown Widow injects significantly less venom during a bite (dry or low-yield bites are common).
Medical Significance
Considered less dangerous than the Black Widow. Symptoms are usually localized to the bite site (pain, redness). Systemic reactions (latrodectism) are rare but can include muscle aches or nausea. Treat with ice and basic wound care; seek medical attention if severe symptoms develop.
Safety Recommendations
Wear gloves when moving patio furniture or working in garages. To relocate, use a jar and a piece of paper to catch the spider and move it to a brush pile away from the house. Vacuuming up webs and egg sacs is an effective control method.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution in tropical and subtropical regions worldwide. Frequently found near human dwellings in 'man-made' microhabitats: under eaves, in patio furniture (as seen here), in garages, or under potted plants.
Behavior & Temperament
Extremely shy and non-aggressive. They prefer to retreat or drop from the web when disturbed. Bites usually only occur when the spider is pressed against skin or person sticks their hand into a hidden retreat.
Diet & Prey
Generalist predators feeding on various insects, including crickets, beetles, and flies. They use their strong silk to hoist heavy prey off the ground into the web.
Seasonal Activity
Year-round activity in warm climates, with peaks in late summer and autumn. They may overwinter in sheltered, man-made structures.
Description
An adaptable member of the widow family, this spider is easily identified here hanging in its messy cobweb. While it shares the 'widow' name, its tan mottling and orange hourglass distinguish it from its more famous black relatives. It is a common synanthrope, meaning it thrives alongside human activity.
Key Features
Tan mottled abdomen, banded legs, orange hourglass on the venter, and specifically the spiky, spherical egg sacs visible in the upper-left of the photo.
Similar Species
Latrodectus mactans (Northern Black Widow) - distinguished by jet black color and red hourglass; Steatoda species (False Widows) - lack the hourglass and have smooth egg sacs.
Life Cycle
Produces distinctive 'spiky' or 'tufted' cream-colored egg sacs (two are visible in the top left of the image). A single female can produce multiple sacs containing 100+ eggs each. Lifespan is approximately 1-2 years.
Ecological Importance
Highly effective at controlling household and garden pests. They consume large numbers of cockroaches and crickets that might otherwise enter homes.
Conservation Status
Not evaluated by IUCN, but populations are stable and expanding internationally as an invasive or introduced species in many regions.
Interesting Facts
The Brown Widow's egg sac is the easiest way to identify the species; no other spider produces a sac with that specific 'spiky ball' appearance. They are often outcompeting Black Widows in urban areas of the Southern United States.
Photography Tips
Focus on the abdomen patterns and, if possible, the underside to show the hourglass. Capturing the 'spiky' egg sacs in the frame is the best way to confirm the ID for others.
Identified: 2026-07-18T00:24:49.689613