Barn Spider, Hentz Orb-Weaver
Neoscona crucifera
Family Araneidae (Orb-Weavers), Order Araneae. Key family characteristics include building vertical wheel-shaped webs, having eight similar-sized eyes, and lacking cribella.
Physical Description
The spider features a robust, rounded abdomen that is noticeably broader than it is long, attached to a distinct, hairy cephalothorax. Sexual dimorphism is prominent, with females being significantly larger, rounder, and more robust than the males. The body texture is covered in fine, short setae and prominent spines along the legs.
Size Estimate
Body length typically ranges from 9 to 19 mm for females (excluding legs), with an overall leg span reaching up to 30 to 40 mm. This specimen appears to be a well-fed adult female.
Coloration & Markings
Base coloration varies widely from yellowish-brown, orange-red, to dark brown or grey. The abdomen typically displays a central leaf-like pattern (folium) or subtle chevron markings, often accompanied by pale spots or a longitudinal line. The legs are strongly banded with dark and light rings.
Web Type
Constructs a classic vertical orb web made of sticky silk, typically spanning 1 to 2 feet in diameter. These webs are frequently built near outdoor lights, porches, or structural corners to intercept flying nocturnal insects.
Eye Arrangement
Consists of eight small eyes arranged in two distinct rows on the anterior portion of the cephalothorax, typical of orb-weavers, with the lateral eyes often grouped in pairs.
Leg Characteristics
Legs are moderately long, stout, and heavily armed with prominent spines and distinct dark banding. They are typically held outstretched in a radial posture when the spider waits on its web.
Venom & Safety Information
Venom Information
Utilizes a mild neurotoxic venom to paralyze insect prey instantly. The venom is specialized for arthropods and is virtually harmless to humans.
Medical Significance
Not medically significant. Bites are extremely rare, usually only occurring if the spider is directly squeezed or trapped against human skin. Symptoms are typically limited to minor, transient localized pain and slight swelling.
Safety Recommendations
No special safety measures are required as they are completely harmless. If relocation is necessary, gently guide the spider into a container using a piece of cardstock and release it outdoors.
Habitat & Behavior
Habitat & Range
Found widely across North America, particularly in eastern and central regions, extending into parts of South America. Prefers nocturnal retreats near human structures, gardens, woodlands, shrubs, and around exterior lighting.
Behavior & Temperament
Nocturnal web-trapper that spends daylight hours hiding in a nearby retreat, emerging at dusk to rebuild or monitor its orb web. Docile and non-aggressive, fleeing or dropping from the web when disturbed rather than biting.
Diet & Prey
Feeds primarily on flying nocturnal insects such as moths, beetles, mosquitoes, and flies captured in its sticky orb web.
Seasonal Activity
Most active and commonly observed during late summer and autumn when adults reach maximum size and females prepare egg sacs. Overwinters primarily in the egg stage.
Description
The Barn Spider is a magnificent and harmless nocturnal architect often spotted gracing porches and gardens across North America. With its warm, autumnal hues and stout, rounded abdomen, it patiently crafts intricate wheel-shaped webs designed to catch night-flying insects. As a master of pest control, it quietly manages mosquito and moth populations around human habitations without causing any harm.
Key Features
Stout, rounded abdomen with variable orange-brown or yellowish coloration, distinctly spiny and banded legs, and the habit of constructing large vertical orb webs near artificial light sources at night.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which features a distinct white cross pattern on the abdomen, and other Neoscona species, which require microscopic examination of genitalia for definitive separation.
Life Cycle
Females construct protective silken egg sacs in sheltered autumn crevices, containing hundreds of eggs. Spiderlings emerge in spring, disperse via ballooning, and mature by late summer or autumn, living for roughly one year.
Ecological Importance
Serves as an effective natural regulator of flying insect populations and functions as an important food source for insectivorous birds and small mammals.
Conservation Status
Common, secure, and widespread throughout its natural geographic range with stable populations.
Interesting Facts
Barn spiders frequently consume and rebuild their entire orb webs nightly to recycle silk proteins and maintain stickiness. They are also famous for being drawn to porch lights due to the high density of prey attracted there.
Photography Tips
Capture images at dusk or night using a macro lens and a diffused flash to highlight the intricate web details and vibrant dorsal patterns without disturbing the spider.
Identified: 2026-09-07T23:21:21.441501