Barn Spider, Hentz Orb-Weaver
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae
Physical Description
The spider possesses a robust, oval-shaped abdomen that is slightly wider near the front, paired with a distinctively smaller, hairy cephalothorax. The body texture is covered in fine, velvety setae. Sexual dimorphism is clearly present, with females growing substantially larger and possessing a much rounder abdomen compared to males.
Size Estimate
Body length ranges from 9 to 19 mm for females, with a leg span reaching up to 35 to 40 mm. This specimen appears to be an adult or subadult.
Coloration & Markings
Base coloration varies from yellowish-brown to dark reddish-brown or grey. The dorsal abdomen typically displays a distinct cross-like pattern or a series of spots and chevrons, flanked by darker margins.
Web Type
Constructs a vertical, classic wheel-shaped orb web, often measuring up to two feet in diameter. It is typically built in evening hours around outdoor structures, porches, and vegetation, and frequently dismantled or consumed by morning.
Eye Arrangement
Eight small eyes arranged in two distinct rows on a raised tubercle on the clypeus, consisting of four central median eyes and two lateral pairs, typical of the orb-weaver family.
Leg Characteristics
Long and moderately thick legs featuring distinct dark and light banding, equipped with numerous spines and fine hairs used to detect vibrations in the web.
Venom & Safety Information
Venom Information
Contains mild neurotoxic venom utilized strictly to immobilize insect prey. It is not potent or dangerous to humans.
Medical Significance
Harmless to humans. A bite may cause minor, temporary localized pain, mild redness, or slight swelling akin to a mosquito sting, requiring no professional medical intervention.
Safety Recommendations
Leave undisturbed outside. If found indoors, gently guide the spider into a container using a piece of card and release it outdoors into the garden.
Habitat & Behavior
Habitat & Range
Commonly found throughout North America, particularly in eastern and central regions. Prefers woodland edges, gardens, and human structures such as barns, porches, and exterior walls where outdoor lighting attracts prey.
Behavior & Temperament
Nocturnal web-builders that typically retreat to a nearby hiding spot or hang in the center of the web during the night. They are docile, non-aggressive, and will only bite if firmly pressed against the skin.
Diet & Prey
Feeds primarily on flying insects such as moths, beetles, mosquitoes, and flies trapped in its vertical orb web.
Seasonal Activity
Most visible and active during late summer and autumn when females reach full adult size and construct webs near outdoor lights.
Description
The barn spider is a familiar and beneficial nocturnal architect, famous for spinning large, intricate orb webs near human dwellings. With its warm reddish-brown tones and distinctive dorsal markings, it serves as an excellent natural pest controller in gardens and around homes.
Key Features
Robust, hairy body with reddish-brown coloration, distinct abdominal markings or a cross pattern, and the creation of large vertical orb webs built primarily at night.
Similar Species
Araneus cavaticus (Barn Spider in a stricter northern sense) and Neoscona domiciliorum (Red house spider). Distinguished by subtle differences in abdominal folium patterns and genital morphology.
Life Cycle
Females construct tough, silken egg sacs in sheltered cracks or vegetation in autumn, containing hundreds of eggs. Spiderlings hatch in spring, dispersing via ballooning, and mature by late summer or autumn.
Ecological Importance
Acts as a primary regulator of flying insect populations, helping to control nuisance bugs and agricultural pests while serving as prey for birds and wasps.
Conservation Status
Not evaluated by the IUCN, but populations are secure, widespread, and highly adaptable to human-modified environments.
Interesting Facts
Many orb-weavers consume their entire web daily to recycle the proteins in the silk before spinning a fresh one just before dusk.
Photography Tips
Photograph at night using a macro lens and a diffused flash to highlight the intricate details of the web and the spider's dorsal markings while maintaining a safe, non-disruptive distance.
Identified: 2026-08-29T11:31:08.755468