Barn Spider, Hentz Orb-Weaver
Neoscona crucifera
Family Araneidae (Orb-Weavers), Order Araneae. Key family characteristics include building vertical, wheel-like orb webs, having eight similar-sized eyes arranged in two rows, and stout, hairy bodies.
Physical Description
The spider features a robust, rounded abdomen that is significantly larger than the cephalothorax, typical of many female orb-weavers. The body is densely covered in fine, hair-like setae, giving it a somewhat fuzzy appearance. The cephalothorax is narrower and features distinct segmentation.
Size Estimate
Body length ranges from 9 to 19 millimeters for females, with a leg span reaching up to 40 millimeters. This appears to be a mature or sub-adult female.
Coloration & Markings
Base coloration varies from yellowish-brown to reddish-brown or dark grey. The abdomen often features a distinctive cross-like pattern or a series of spots and lines, though individuals can sometimes appear uniformly pale or dark depending on lighting and morph.
Web Type
Builds a classic, large vertical orb web characterized by sticky spiral threads and non-sticky radial threads, often constructed near lights or structures to catch flying insects.
Eye Arrangement
Eight eyes arranged in two rows of four (anterior and posterior rows), with the lateral eyes often grouped in pairs and the median eyes set on a slight raised tubercle.
Leg Characteristics
The legs are moderately long, stout, and heavily spined with distinct dark and light banding patterns. They are frequently held in a splayed, ready-to-react posture when resting at the center of the web.
Venom & Safety Information
Venom Information
Possesses mild neurotoxic venom used primarily to subdue insect prey. It is not potent enough to cause harm to humans.
Medical Significance
Harmless to humans. A bite may cause minor, localized pain or redness similar to a mosquito sting, requiring no special medical treatment.
Safety Recommendations
No special safety measures are required. If one builds a web in an inconvenient location, it can be gently relocated using a stick or container to a nearby garden.
Habitat & Behavior
Habitat & Range
Found commonly throughout North America, particularly in eastern and central regions. Prefers outdoor habitats near human structures, barns, porches, gardens, and wooded edges where artificial lights attract prey.
Behavior & Temperament
Nocturnal by nature, remaining hidden during the day and sitting head-down at the center of the web at night. Docile and non-aggressive towards humans, only biting if trapped or severely provoked.
Diet & Prey
Feeds primarily on flying nocturnal insects such as moths, beetles, mosquitoes, and flies caught in its sticky web.
Seasonal Activity
Most active and noticeable during late summer and autumn when adults reach full size, build large webs, and engage in mating before dying off with the first hard frosts.
Description
The Barn Spider is a magnificent nocturnal architect, spinning elaborate orb webs that shimmer under porch lights. As a member of the orb-weaver family, it plays a vital role in controlling flying insect populations around human dwellings while remaining entirely harmless to people.
Key Features
Large, rounded abdomen, prominent spiny and banded legs, nocturnal web-building habit, and a preference for hanging head-down in a vertical orb web near light sources.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which features a more distinct white cross on the abdomen, and other Neoscona species, distinguished by subtle epigynal and coloration differences.
Life Cycle
Females construct silk egg sacs in protected crevices during autumn, laying hundreds of eggs. Spiderlings hatch in spring, disperse via ballooning, and mature by late summer or fall, completing a one-year life cycle.
Ecological Importance
Acts as an effective natural pest control agent by consuming large numbers of flying insects, and serves as an important food source for birds and small mammals.
Conservation Status
Not evaluated by the IUCN, but populations are stable, widespread, and highly resilient in human-modified landscapes.
Interesting Facts
Barn spiders frequently consume and rebuild their entire orb webs every single night to maintain the stickiness and integrity of the silk structure.
Photography Tips
Use a macro lens with a flash or external light source at night when the spider is active in its web. Capture dorsal shots to highlight the abdominal patterns and leg banding.
Identified: 2026-08-27T03:39:16.465979