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Black Widow Spider
Characteristics of SpidersSpiders have eight legs, two body regions, and no wings or antennas. They have three or four pair of eyes.
Habits and Lifestyle:The lifestyle can vary between spiders. Some spiders like to live in damp conditions such as basements, and crawl spaces. Other spiders prefer to live in dry, warm areas such as air vents, upper corners of rooms and attics and hide in dark areas.
Spiders feed on insects, other spiders, and any other prey they can subdue. Spiders produce silk that is elastic and strong. Their silk is used to spin webs where they can live and keep their egg sacs. Each web's size and shape is varied according to the spider. Some webs are orb-shaped, while others are funnel-shaped, orderly, haphazard, etc. Some spider species live in burrows instead of webs, while others live in crevices. Spider BitesAlmost all spiders are venomous, but the black widow, brown recluse, hobo, and yellow sac spiders are the most venomous spiders in the United States.
Black Widow Spiders:Characterized by the hourglass marking on its belly. The bite feels like a pinprick. Signs and symptoms of the bite can include: swelling, faint red marks, intense pain and stiffness, severe abdominal pain or cramping, excessive sweating.
Webs are commonly found near ground level with irregular shape, uneven lines and even tangled. 
Brown Recluse Spiders:Characterized by a violin-shaped marking on its back, which can be difficult to see. Signs and symptoms of the bite can include: at first a mild stinging, redness and intense pain within 8 hours, a deep blue or purple area around the bite (which may develop a red ring around it)
Webs are commonly found in storage boxes, shoes, clothing, tires, beneath furniture; the web is loose, sticky, and colored off-white or grayish. 
Hobo Spider
Hobo Spiders:The bite of a Hobo Spider is initially painless and it has long been thought that the venom causes necrotic lesions to humans but recent studies do not bear that out. Necrotic venom will cause redness to first appear around the bite site, which will develop into a blister after 24 hours, before breaking open, leaving an open, oozing ulceration. The bite might also cause severe headaches lasting 2 to 7 days and even nausea, weakness, fatigue, malaise, temporary memory loss and vision impairment.
Webs are funnel-like in shape. 
Yellow Sac Spider
Yellow Sac Spiders:This species has a mildly toxic venom. Bites can be painful and cause skin irritations: erythema, edema and pruritis. Yet, though wounds may become slightly necrotic, they usually heal in rather rapidly without severe scarring.
They create a sac instead of a web, and prefer a corner usually near the ceiling Signs of Infestation:Check for spiders webs
Spider eggs are in a silken sac, which may be fixed on a surface, hidden in the web or carried by the female There are two primary ways spiders can enter the home: open, poorly screened windows and doors and through cracks around door and window frames. Another common method of entry is by coming inside through boxes, an outdoor item, and other materials that are brought inside. If you find spiders in your home, contact your pest management professional. They will be able to conduct an inspection and create a control plan to best eliminate the issue. 
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SPIDER Species that can be found in Richmond, VA
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Ways to Reduce Spiders:
Contact your pest management professional to conduct an inspection to create a control plan or try a few of the suggestions below:
However, if you have a high amount of spiders in your home, it is best to contact your pest control professionals, especially if the spider infestation that you are dealing with could be poisonous.
- Keep your house neat and tidy with clutter packed away in containers that have a tight fitting lid.
- Seal the cracks in your home especially around the outside perimeter.
- Remove vegetation from the perimeter of your residence to let the sun shine in strongly- critters can't deal with this.
- Apply a residual pesticide all around the outside perimeter of the dwelling and also lay it along the windows.
- Keep outdoor lights off so prey will loose sight of your home and perhaps visit a neighbor instead.
However, if you have a high amount of spiders in your home, it is best to contact your pest control professionals, especially if the spider infestation that you are dealing with could be poisonous.