The American House Spider, scientifically known as Parasteatoda tepidariorum, is a common inhabitant found across North America. This species is frequently encountered in and around human dwellings. These arachnids often establish themselves in various areas within a home, creating their characteristic webs in undisturbed spaces.
Do American House Spiders Bite Humans?
American House Spiders are generally not aggressive and rarely bite humans. They typically bite only in self-defense, such as when accidentally pressed against the skin or trapped in clothing. While they possess venom, it is not considered medically significant to humans. Most bites from this species are harmless and cause only minor, localized reactions.
Identifying American House Spiders
American House Spiders are relatively small, with females typically measuring between 3/16 and 5/16 of an inch, while males are slightly smaller. Their coloration can vary, often appearing brownish-gray, yellowish-brown, or sometimes black, and they may have dark markings or patterns on their abdomen. A distinguishing feature is their globular abdomen, which gives them a somewhat rounded appearance. They are also known for constructing irregular, messy, and tangled “cobwebs,” typically found in corners or less disturbed areas of a home.
What to Expect and Do After a Bite
Should an American House Spider bite occur, the symptoms are usually mild and localized. Individuals might experience minor pain, redness, swelling, or itching at the bite site, often comparable to a bee sting or mosquito bite. To care for the bite, clean the area thoroughly with mild soap and water to prevent infection. Applying a cold compress or ice pack to the affected area can help reduce pain and swelling. Over-the-counter pain relievers can manage discomfort, and antihistamines may alleviate itching.
Monitor the bite for any changes. Seek medical attention if symptoms worsen, if there are signs of infection such as increasing redness, warmth, pus, or if an allergic reaction develops. Severe symptoms like difficulty breathing, widespread rash, or intense muscle cramps, though unlikely from an American House Spider bite, warrant immediate medical evaluation.
Their Role in Your Home
American House Spiders play a beneficial role within a home environment. They act as natural pest controllers, preying on various common household insects. Their diet typically includes flies, mosquitoes, ants, and other small arthropods that may infest living spaces. By consuming these insects, American House Spiders contribute to managing pest populations, offering a subtle form of biological control.