Grass Spider, American Grass Spider, Funnel Weaver
Agelenopsis sp. (likely Agelenopsis pennsylvanica)
Agelenidae (Funnel Weavers), Order Araneae
Physical Description
Elongated, pear-shaped body with a distinctively long pair of spinnerets protruding from the rear of the abdomen. The cephalothorax is prominent with vertical stripes, and the abdomen is tapered.
Size Estimate
Estimated body length 10-20mm with a leg span of 25-50mm. This appears to be an adult specimen.
Coloration & Markings
Light brown to tan base color. The cephalothorax features two prominent dark longitudinal stripes. The abdomen has a lighter central band bordered by darker, mottled patterns.
Web Type
Builds a sheet-like horizontal web with a funnel-shaped retreat at one end, usually located in thick grass, shrubs, or corner crevices.
Eye Arrangement
Eight eyes arranged in two rows of four, appearing as a characteristic 'frowny face' pattern or a moderately curved arrangement when viewed from the front.
Leg Characteristics
Long, slender legs with dark banding or spotting and noticeable black bristles (macrosetae). Leg IV is usually the longest to assist in fast running.
Venom & Safety Information
Venom Information
Neurotoxic venom designed to paralyze small insects. Potency is very low regarding humans and is not considered medically significant.
Medical Significance
Harmless. Bites are rare and usually only occur if the spider is pressed against skin. Symptoms are typically less severe than a bee sting, involving minor swelling or redness.
Safety Recommendations
No special precautions needed. If found indoors, they can be easily relocated outside using a cup and a piece of paper. They pose no threat to pets or children.
Habitat & Behavior
Habitat & Range
Common throughout North America. Found in gardens, meadows, and frequently entering homes during autumn to escape cooling temperatures.
Behavior & Temperament
Highly active and extremely fast runners. They are non-aggressive ambush predators that wait in their funnel retreat for vibrations on the sheet web.
Diet & Prey
Generalist predators feeding on various crawling and flying insects such as crickets, flies, moths, and beetles that land on their web.
Seasonal Activity
Peak activity occurs in late summer and early autumn when adults reach full size and males wander in search of mates.
Description
The Grass Spider is a ubiquitous and beneficial hunter often seen darting across its silken sheet at lightning speed. It is a master of vibrations, sensing the slightest movement of prey before rushing out of its funnel-shaped tunnel to secure a meal.
Key Features
Prominent long spinnerets at the end of the abdomen and two dark longitudinal stripes on the carapace.
Similar Species
Often confused with Wolf Spiders (Lycosidae), which lack the long spinnerets, or the Brown Recluse (Loxosceles reclusa), which lacks stripes and has a violin-shaped mark.
Life Cycle
Females lay egg sacs in late summer or fall, often in crevices or under bark. The mother dies after frost, and spiderlings emerge in the spring.
Ecological Importance
Critical for natural pest control in gardens and around homes, consuming large quantities of insects that may otherwise damage plants or enter dwellings.
Conservation Status
Not evaluated by IUCN, but currently abundant and stable across their native range.
Interesting Facts
Despite their speed, they rarely leave their webs unless disturbed or searching for mates. Their silk is non-sticky; they rely entirely on speed to catch prey before it escapes the sheet.
Photography Tips
Focus on the top of the cephalothorax to capture the stripes and the rear of the abdomen to document the long spinnerets for definitive identification.
Identified: 2026-07-15T17:47:02.944009