Body length: 2.5 to 3 mm. Prosoma red-brown, margin darkened. Sternum red-brown. Chelicerae without denticles. Legs yellow-brown, tibia and metatarsus darker. Opisthosoma dark brown to black.

Confirmation of this species requires examination of the genitalia of mature specimens.

Found in a variety of habitats including undergrowth and leaf litter in broad-leaved woodland, and in moss and grass.

Spring-Autumn.

Widespread but scattered in Britain.

Uncommon in Leicestershire and Rutland.

http://srs.britishspiders.org.uk/portal.php/p/Summary/s/Agyneta+subtilis