Barn Spider, Hentz Orb-Weaver
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae. Key family characteristics include building vertical, wheel-like orb webs and possessing eight similar eyes arranged in two rows.
Physical Description
Robust, hairy body with a distinct oval to triangular abdomen and a smaller cephalothorax. Females are significantly larger and more robust than males, featuring small hump-like tubercles near the front of the abdomen.
Size Estimate
Body length typically ranges from 9 to 19 mm for females and 8 to 13 mm for males, with a leg span reaching up to 30 to 40 mm. The specimen in the image appears to be a medium-to-large adult.
Coloration & Markings
Variable coloration ranging from straw-yellow, reddish-brown, to dark brown or grey. The abdomen often features a distinct leaf-like pattern or cross-like markings (cruciform), bordered by dark lines and lighter spots.
Web Type
Constructs large, vertical orb webs typically measuring up to two feet across. These webs feature a sticky spiral for catching flying prey and are often built near outdoor lighting or building structures.
Eye Arrangement
Eight small eyes arranged in two horizontal rows on the anterior portion of the cephalothorax, typical of the orb-weaver family.
Leg Characteristics
Long, robust legs with prominent dark and light banding, covered in fine setae and spines. They are typically held outstretched or gathered defensively when disturbed.
Venom & Safety Information
Venom Information
Neurotoxic and proteolytic venom designed specifically to immobilize small invertebrate prey. It poses no chemical or medical threat to humans.
Medical Significance
Harmless to humans. Bites are extremely rare, occur only in self-defense when squeezed against the skin, and typically result in only minor, temporary localized pain and redness comparable to a mild mosquito bite.
Safety Recommendations
No special safety measures needed. If found indoors or in an inconvenient location, easily relocated outside using a cup and a piece of paper.
Habitat & Behavior
Habitat & Range
Common throughout North America, particularly in eastern and central regions. Frequently found around human structures, barn eaves, porches, gardens, and wooded areas where insects congregate.
Behavior & Temperament
Nocturnal hunters that often retreat to a hidden shelter or the hub of the web during the day. Non-aggressive and docile, preferring to drop to the ground or retreat when threatened.
Diet & Prey
Feeds primarily on flying nocturnal insects such as moths, beetles, mosquitoes, and flies intercepted by its large orb web.
Seasonal Activity
Most active and noticeable during late summer and autumn when females reach maximum size, mature, and construct egg sacs before dying off with the first hard frosts.
Description
The Barn Spider is a familiar and beneficial nocturnal architect found gracing the exteriors of buildings and gardens. With its characteristic reddish-brown coloration and robust abdomen, it spends daylight hours resting quietly before spinning a massive, intricate orb web at dusk to catch passing insects.
Key Features
Distinguished by its reddish-brown or yellowish body, the characteristic leaf-like or cross pattern on the dorsal abdomen, robust spiny legs, and the construction of large vertical orb webs near human dwellings.
Similar Species
Other Araneus and Neoscona species, such as the Marbled Orb-Weaver (Araneus marmoreus) or the Shamrock Orb-Weaver (Araneus trifolium). Distinguished by specific abdominal patterning and subtle structural differences.
Life Cycle
Females construct silken egg sacs in protected crevices or foliage in autumn, containing hundreds of eggs. Spiderlings hatch in spring, dispersing via ballooning. Adults typically live for one season, completing their life cycle within a year.
Ecological Importance
Acts as a vital natural predator of flying insect populations, helping to control agricultural pests, mosquitoes, and nuisance bugs around homes.
Conservation Status
Not evaluated by the IUCN, but populations are widespread, stable, and highly abundant across their native range.
Interesting Facts
Barn spiders are prolific builders, often consuming and rebuilding their entire large orb web every single night to maintain optimal stickiness for catching prey.
Photography Tips
Best photographed at night using a flash to illuminate the web and capture the spider's dorsal patterns clearly. Maintain a safe macro distance and avoid disturbing the web.
Identified: 2026-09-07T20:48:44.828123