In the United States there are over a million spiders and a majority of them live in our homes! Here is a list of the most common house spiders found in Kansas by Lawrence PC:
Cellar Spider, “Daddy Long-legs” (Pholcidae)
The cellar spider’s body is fragile. Its body is 2-10 mm in length with its legs which can be up to 50 mm long. There are two different species of cellar spiders. There is the Pholcus, which is most common, and then the Smeringopus.
The Pholcids range from a gray to brown color with banding across their abdomen. The Spermophora have round abdomen, and its eyes are arranged in two separate groups of three, they also do not have median eyes.
Cobweb Spider (Parasteatoda Tepidariorium)
One of the most common spiders found in homes is the cobweb spider. This spider is a dull brown with patterns varying shades of brown down its legs. Its body size is a quarter-inch long, but they can grow to become an inch. Both their size and color allow them to escape without being noticed.
Brown Recluse (Loxosceles Reclusa)
These spiders have a venomous bite, caution is advised when encountered. It can grow to be 6-20 mm in size. Although it is typically a light medium brown it can be anywhere from cream-colored to dark brown or blackish gray. These spiders are easy to identify because their defining feature is a black line that resembles a violin going down their cephalothorax.
Black Widow (Latrodectus)
The black widow is infamously known for the red or orange hourglass shape on the underside or bottom of the females’ abdomen. The females of this species are significantly larger than juveniles and adult males. The juveniles and adult males are about half the size of the females. Males are also grey or brown in color and the hourglass marking may be yellow or white, not red.
The bite of this spider is also venomous.
Sac Spider (Clubiona Trivialis)
These arachnids are typically yellow but they can be green, tan, straw and light-brown. Their front legs are longer than their back legs. Their mouthparts are darker than their bodies. They also have a band running laterally down their abdomen. These spiders are also relatively small. Because of their small size these spiders can be overlooked and can be confused with other species. These spiders can be found in their silk tubes in gardens, woodpiles, and timber and leaf piles. However in the fall these spiders will migrate indoors. During the fall their populations increase and can cause indoor infestations.