Barn Spider, Hentz Orb-Weaver
Neoscona crucifera
Araneidae (Orb-Weavers), Order Araneae. Key family characteristics include building vertical, wheel-like orb webs and having eight similar eyes arranged in two rows.
Physical Description
The spider has a robust, highly rounded, bulbous abdomen that overhangs the cephalothorax, and a hairy, brownish-orange cephalothorax. The body texture is somewhat velvety with short setae.
Size Estimate
Body length of the adult female is roughly 12 to 19 mm, with a leg span of around 35 to 45 mm. This specimen is a large adult female.
Coloration & Markings
The coloration ranges from reddish-brown, tan, to grayish. The dorsal abdomen typically features a distinct cross-like pattern or a series of light and dark spots, often with pale yellowish or white markings near the anterior end.
Web Type
A classic large, vertical orb web measuring up to two feet across. It features sticky spiral threads and a non-sticky hub where the spider typically hangs head-down.
Eye Arrangement
Eight small eyes arranged in two rows on the anterior portion of the carapace, typical of the orb-weaver family Araneidae, with lateral eyes often grouped together.
Leg Characteristics
Long, robust legs featuring prominent dark and light banding, covered in numerous spines and hairs to assist in tactile sensing and prey capture.
Venom & Safety Information
Venom Information
Neurotoxic and proteolytic venom utilized strictly to subdue invertebrate prey. It has virtually no significant medical impact on humans.
Medical Significance
Not medically significant. Bites are extremely rare, usually only occurring if the spider is directly squeezed or trapped against the skin, resulting in mild, localized pain and minor swelling comparable to a mosquito bite.
Safety Recommendations
No special precautions needed beyond avoiding handling them with bare hands. If one is inside the house, gently trap it under a glass and release it outdoors where it can set up its web.
Habitat & Behavior
Habitat & Range
Found widely across North America, particularly east of the Rocky Mountains. Prefers wooded edges, gardens, porches, and the exterior walls of barns and houses where artificial lights attract flying prey.
Behavior & Temperament
Nocturnal web-builders that typically construct or rebuild their webs at dusk and hide in nearby crevices or retreat areas during daylight hours, though females attending webs may remain central. Very docile and non-aggressive toward humans.
Diet & Prey
Primarily feeds on flying nocturnal insects such as moths, beetles, mosquitoes, and flies caught in its vertical orb web.
Seasonal Activity
Most active and noticeable during late summer and autumn when females reach their maximum size and build large webs to feed and prepare for egg-laying before perishing with the first hard frosts.
Description
The Barn Spider is a familiar and welcome guest around rural and suburban homes in North America. Known for constructing massive, intricate orb webs near porch lights, this robust nocturnal weaver spends its days hidden away before coming out at dusk to tend its trap. With its mottled brown and reddish tones and distinct abdominal markings, it is a master of pest control, quietly consuming countless flying insects throughout the warm months.
Key Features
Bulbous reddish-brown or grayish abdomen with a faint cross or spotted pattern, large size, hairy legs with dark banding, and the classic vertical orb web built near lights or structures.
Similar Species
Cross Orb-Weaver (Araneus diadematus), which usually features a more distinct white cross on the abdomen, and other Neoscona species, which require detailed examination of genital plates for definitive separation.
Life Cycle
Females lay eggs in late autumn, encasing them in a silken egg sac attached to protected structures or vegetation. Spiderlings hatch in spring, undergo multiple molts, and reach maturity by late summer or autumn.
Ecological Importance
Acts as an effective natural predator of flying insect populations, helping control pest species around human habitations and functioning as a vital link in the local food web.
Conservation Status
Not evaluated by the IUCN, but populations are secure, widespread, and highly adaptable to human-altered environments.
Interesting Facts
Barn spiders often consume and rebuild their entire orb webs every single night to recycle silk proteins and maintain the stickiness of the trap.
Photography Tips
Shoot at dusk or night using a macro lens and an external flash, as this is when the spider is active in its web. Capture dorsal shots of the abdomen and side profiles to highlight markings and leg banding.
Identified: 2026-09-05T13:20:12.738026