Barn Spider, Hentz Orb-Weaver
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae. Characterized by robust bodies, excellent vision, and the ability to spin classic wheel-shaped orb webs.
Physical Description
The spider has a robust, oval-to-triangular abdomen that is slightly wider at the base near the cephalothorax, typical of many orb-weavers. The cephalothorax is smaller, brownish, and covered in fine setae. The overall texture is hairy with distinct spines visible along the legs.
Size Estimate
Body length ranges from 9 to 20 millimeters for females, with males being smaller. Leg span is approximately 25 to 40 millimeters, consistent with an adult female specimen.
Coloration & Markings
Deep brown, reddish-brown, and tan mottled patterns dominate the dorsal side. The abdomen often features a central darker leaf-like folium pattern or indistinct markings, accompanied by lighter lateral bands.
Web Type
Vertical orb web constructed at night, featuring a sticky spiral and a non-sticky hub where the spider typically hangs head-down waiting for prey.
Eye Arrangement
Eight eyes arranged in two rows of four, typical of orb-weavers, with lateral eyes often grouped together and median eyes set on a raised tubercle.
Leg Characteristics
Long, strong legs featuring distinct dark and light banding, prominent spines, and specialized claws used for navigating and constructing the orb web.
Venom & Safety Information
Venom Information
Neurotoxic/cytotoxic venom designed primarily to immobilize small invertebrate prey. It poses no chemical or medical threat to humans.
Medical Significance
Not medically significant. A bite may cause minor, localized pain, redness, or swelling similar to a mosquito bite, but this is extremely rare.
Safety Recommendations
Leave undisturbed in its web outdoors. If found inside, gently cup it under a glass and release it outdoors into a garden or wooded area.
Habitat & Behavior
Habitat & Range
Commonly found throughout North America, particularly in eastern and central regions. Prefers outdoor structures, barns, porches, gardens, and wooded areas where they build webs near lights that attract flying insects.
Behavior & Temperament
Nocturnal hunter that rebuilds or repairs its web at dusk and retreats to a nearby crevice or foliage during the day. Generally docile and reluctant to bite unless directly trapped or squeezed.
Diet & Prey
Primarily feeds on flying insects such as moths, beetles, mosquitoes, and flies captured in its vertical orb web.
Seasonal Activity
Most active and noticeable during late summer and autumn when females reach maximum size, produce egg sacs, and mate.
Description
The Barn Spider is a familiar nocturnal architect, often spinning large wheel-shaped webs near outdoor lights to catch unsuspecting insects. With its robust, mottled brown body and hairy legs, it is a quintessential orb-weaver that brings beneficial pest control to gardens and agricultural buildings.
Key Features
Robust hairy abdomen with mottled brown and reddish tones, prominent leg spines with subtle banding, and the classic habit of constructing vertical orb webs near human structures.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which features a prominent white cross on the abdomen, and other Neoscona species which require microscopic examination for definitive separation.
Life Cycle
Females produce silk-wrapped egg sacs in autumn, attaching them to sheltered surfaces. Spiderlings hatch in spring, disperse via ballooning, and mature by late summer or autumn.
Ecological Importance
Acts as an effective natural pest control agent by consuming large quantities of flying agricultural and household insect pests.
Conservation Status
Secure and widespread; not evaluated by the IUCN, with robust populations across its native range.
Interesting Facts
Barn spiders frequently consume and recycle their entire orb web every morning to reclaim proteins before retreating to hide from daytime predators.
Photography Tips
Use a macro lens with a ring flash or diffused side lighting at night when the spider is active in its web to highlight color patterns and leg spination.
Identified: 2026-10-10T18:02:33.175921