Barn Spider, Hentz Orb-Weaver
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae
Physical Description
Robust, hairy body with a distinctively swollen, bulbous abdomen featuring a pointed rear end, and a smaller, rounded cephalothorax covered in dense setae.
Size Estimate
Body length ranges from 9 to 19 mm for females and 8 to 13 mm for males, with a substantial leg span reaching up to several centimeters.
Coloration & Markings
Mottled shades of brown, yellowish-orange, and grey, featuring a prominent dark ventral or dorsal marking on the abdomen often framed with lighter yellow or white spots.
Web Type
Vertical orb web constructed with sticky spiral threads, typically built at night and often rebuilt daily, placed near lights, porches, or structural attachments.
Eye Arrangement
Eight eyes arranged in two rows typical of orb-weavers, with the lateral eyes often paired and median eyes set on a slight raised tubercle.
Leg Characteristics
Long, robust legs featuring distinct dark banding, prominent spines, and specialized claws for navigating and managing tension in the orb web.
Venom & Safety Information
Venom Information
Neurotoxic/cytotoxic venom used strictly to subdue invertebrate prey, completely harmless to human health.
Medical Significance
Harmless; does not possess medically significant venom, and bites are extremely rare, resulting only in mild localized discomfort if provoked.
Safety Recommendations
No special precautions needed beyond standard caution; if relocation is necessary, gently guide the spider into a container and release it outdoors.
Habitat & Behavior
Habitat & Range
Found widely across North America, commonly associated with human structures such as barns, porches, fences, and outdoor lighting, as well as woodland edges and gardens.
Behavior & Temperament
Nocturnal web-builder that spends daylight hours hiding nearby or resting head-down in the center of the web, docile and non-aggressive toward humans.
Diet & Prey
Insects attracted to outdoor lights such as moths, beetles, mosquitoes, and flies, captured by entanglement and quickly wrapped in silk.
Seasonal Activity
Most active and noticeable during late summer and autumn when individuals reach adult size and females construct egg sacs.
Description
The Barn Spider is a familiar nocturnal architect of the autumn garden. Displaying a richly mottled brown coat and a swollen, bulbous abdomen, this orb-weaver builds large, intricate vertical wheels of silk designed to intercept flying insects attracted to porch lights. Though large and intimidating to some, it is a completely harmless and beneficial neighbor.
Key Features
Hairy, robust body, distinctive dark abdominal markings bordered by pale spots, nocturnal habit of building large vertical orb webs near lights.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which features a prominent white cross pattern on the dorsal abdomen rather than the markings of Neoscona crucifera.
Life Cycle
Females construct silken egg sacs in late autumn containing hundreds of eggs, which overwinter before spiderlings emerge in spring to disperse via ballooning.
Ecological Importance
Acts as an effective natural predator of flying insect populations, helping control pest species around homes and agricultural structures.
Conservation Status
Secure and widespread, with stable populations thriving across its native range without special conservation concerns.
Interesting Facts
Barn spiders frequently dismantle and consume their own webs every morning to recycle the protein-rich silk before hiding from daytime predators.
Photography Tips
Photograph at night with a flash to capture the spider active in the center of its web, using a macro lens to highlight the abdominal patterns and leg spination.
Identified: 2026-09-22T23:27:19.926976