Entomology (Study of Bugs)/worm bug

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Question
Good Morning Mr. DeAngelis, I found on my living room tile floor this morning a flat white/grayish flat bug/worm and I was freaked out! I looked on line under Bugs and found a picture that looked very close to what I have. It seems to be a worm type bug with seems like the head is on both sides of the body. The black head pops out from both sides and it crawls like a worm or snail. I first thought it was a small piece of paper on the floor. Its gross! Where does it come from? Is it harmful to humans? Should I be worried and call an exterminator? The name of the bug on the website said it was 'Worm inside cacoon hanging on wall'. Can you give me more information on it?

Answer
Rosie,

I'd need to see a photo to be sure but it sounds like you have a plaster bagworm. This is a type of clothes moth (see http://www.livingwithbugs.com/clothes_moth.html for info). Plaster bagworms are fairly common in warm climates. They can damage natural fabrics under some circumstances but are basically harmless.

Jack DeAngelis

Entomology (Study of Bugs)

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Jack DeAngelis

Expertise

I can answer questions in any area of entomology (study of insects, spiders, mites, ticks, and other terrestrial arthropods). Contact me about home and garden insects, insects that bite and sting, and insects that damage homes such as carpenter ants and termites.

Experience

20 years as university extension entomologist, now retired; currently publish a website about home and garden insects.

Publications
see www.livingwithbugs.com/resume.html

Education/Credentials
Ph.D. in Entomology

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