Barn Spider, Hentz Orb-Weaver
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae. Key family characteristics include building vertical wheel-shaped orb webs, eight similar eyes, and three claws on the tarsi.
Physical Description
The body features a distinct oval to slightly triangular abdomen and a robust, hairy cephalothorax. The proportions are typical of many orb-weavers with a larger, bulbous abdomen capable of holding eggs and silk glands, while the legs are spread out widely for stability.
Size Estimate
Body length is estimated around 10 to 15 millimeters with a leg span of approximately 25 to 35 millimeters, representing a typical adult or sub-adult specimen.
Coloration & Markings
Features a mottled brown, tan, and grey base coloration with intricate, camouflage-like patterns. The abdomen often displays a distinct leaf-like or scalloped folium pattern with darker edges and pale spots, helping it blend into wooden or textured backgrounds.
Web Type
Builds a classic vertical orb web, a finely engineered circular spiral trap designed to intercept flying insects, typically constructed near structures, lights, or vegetation.
Eye Arrangement
Arranged in two rows of four eyes each on the anterior cephalothorax, with lateral eyes often grouped together, typical of the orb-weaver family.
Leg Characteristics
Legs are moderately long, robust, and heavily banded with alternating dark and light rings, bearing numerous spines and stiff hairs used for detecting vibrations in the web.
Venom & Safety Information
Venom Information
Possesses mild neurotoxic venom tailored specifically for immobilizing small invertebrate prey. It is not potent or dangerous to humans.
Medical Significance
Harmless to humans. Bites are extremely rare and typically only occur if the spider is squeezed directly against the skin, resulting in mild, localized discomfort similar to a mosquito bite.
Safety Recommendations
No special safety measures are required as they are completely harmless. If relocation is desired, gently guide the spider into a container using a piece of cardstock and release it outdoors.
Habitat & Behavior
Habitat & Range
Found across North America, commonly inhabiting outdoor walls, barns, porches, gardens, and areas near exterior artificial lighting that attracts flying insect prey.
Behavior & Temperament
Nocturnal web-weavers that often hide in a retreat or sit near the center of the web at night. They are docile, timid, and non-aggressive toward humans, typically retreating or dropping to the ground if disturbed.
Diet & Prey
Feeds on a wide variety of flying insects, including moths, beetles, mosquitoes, and flies, caught dynamically in their sticky orb webs.
Seasonal Activity
Most active and noticeable during late summer and autumn when adults reach maximum size, build large webs, and engage in mating before dying off with the first hard frosts.
Description
The Barn Spider is a familiar nocturnal architect, frequently spotted weaving its intricate circular webs near outdoor lights and wooden structures. With its mottled brown camouflage and bulbous abdomen, this harmless orb-weaver acts as a master pest controller, quietly reducing flying insect populations around homes and gardens.
Key Features
Hairy, robust body with a mottled brown and tan pattern; distinctive folium markings on the abdomen; vertical orb web constructed near artificial light sources.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which features a prominent white cross pattern on the abdomen, and other Neoscona species, distinguished primarily through microscopic genital examination.
Life Cycle
Females construct silken egg sacs in sheltered cracks or crevices during autumn, containing hundreds of eggs. Spiderlings emerge in spring, dispersing via ballooning before maturing through a series of molts over a single season.
Ecological Importance
Serves as an important natural predator of flying insect pests, helping to regulate populations of moths, mosquitoes, and other agricultural or domestic insects.
Conservation Status
Secure and widespread, with stable populations facing no significant conservation threats.
Interesting Facts
Barn spiders are famous for rebuilding their large orb webs almost every single night, consuming the old silk to recycle valuable proteins before spinning a fresh trap.
Photography Tips
Use a macro lens with a flash or external light source at night when the spider is active in the center of its web. Capture dorsal views and side angles to clearly show abdominal markings.
Identified: 2026-09-09T02:14:38.558820