Adult Male Brown Recluse
Hides in dark undisturbed areas.
Bite can cause Necrosis.
Adult Female Black Widow
The Male Black Widow has 3 red dots on abdomen , instead of the red hourglass.
Mostly found outdoors in areas usually undisterbed.
Male Wolf Spider
This is a "good spider", it eats other spiders, including brown recluse and can be found inside or outside. The female carries the egg sack on her abdomen, when it hatches she carries as many as 100 spiderlings on her body at one time.
Writing Spider- Hanging around waiting for lunch.
Jumping spider does not bite
Undisturbed areas are often homes to many pests including spiders and termites.