Prowling spiders (Family Eutichuridae; formerly known as Miturgidae)
There are three species of prowling spiders known from Ohio. This represents <1% of our spider species. One species (yellow sac spider) is very common in buildings.
Characteristics of Eutichuridae:
- leg tips with dense claw tufts and scopulae which permits them to climb smooth vertical surfaces with ease
- conical anterior spinnerets, closely spaced
- usually pale, nocturnal spiders
- chelicerae often somewhat long
- found on vegetation, often in houses
These sac spiders are pale colored, tan, light yellow, or pale greenish. They hunt at night, running rapidly over surfaces and vegetation in search of prey. They fuel their constant running by feeding on sugary plant nectar when they encounter it in flowers or nectaries. The yellow sac spider (Cheiracanthium mildei) is one of the most common spiders in houses and other buildings. During the day they can often be found in a thin silk cocoon in corners of structures, often at the join of a wall and the ceiling.