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spider beetle illustration

The American spider beetle adult is 1.5 to 3.5 millimeters in length and has an abdomen that is dark reddish-brown or black and shiny. Its head, legs, thorax, and antennae are covered with pale yellow to cream colored hairs. They are small beetles that belong to the family Anobiidae, and they are called spider beetles because they look like small spiders. Though some think they look more like large mites.

A whitemarked spider beetle has patches of white hairs on its wing covers, as the name suggests. However, these white patches are often rubbed off on older beetles, and the abdomens of the males are thinner and more elongated than those of the females.
The smooth spider beetle is smaller in shape than the American spider beetle, but its coloring is the same. This species, more than the others, resembles a large, red-colored mite.

The larvae of all three species of spider beetles are cream colored with light brown heads and are shaped like a ‘C’. Larvae can reach up to 4 millimeters in length.

Why should I be concerned about spider beetles in my home?

Spider beetles don't bite or sting and pose no real threat to you or your family, but they do pose a threat to your belongings. They will eat anything from dried food products and wool, to hair and animal droppings. They are rarely seen since they prefer to forage at night or in dark locations. They also prefer damp areas and like to feed on food that has been spoiled by moisture. They generally can be found within walls or in attic spaces and in the nests of birds and rodents (which could also be inside your home). They are active year round even in temperatures that are below freezing.

How to keep spider beetles out.

If you want to keep spider beetles out of your home, it is important to keep it clean. Throw out any old or expired food that can attract them, and keep all new foods in air-tight, sealed containers. Make sure to sweep or mop any areas where food is prepared, and do a thorough cleaning of your home, paying attention to places that don't often get cleaned such as between the stove and the counter.

If you have already noticed a spider beetle infestation, or if you don't want to take any chances, it is time to consider professional help. Here at Rottler Pest and Lawn Solutions, we offer a thorough home inspection that is absolutely free. We will come out and tell you if you are dealing with spider beetles or any other household pest so you can take action. While spider beetles don't pose a threat to your health, many other pests such as rodents and cockroaches do. Start the new year out right with a pest-free home.

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