[Actually, someone posted this question by creating a whole new Wiki page. It properly belongs as a discussion here in the Forum, so I'm reposting the question here on their behalf.]
They are common in old houses in MA. You should take all food out of pantry, have a vacuum cleaner handy, nearby, such as a Shopvac to catch any moths that take off, and clean the shelves with a baking soda and dish detergent solution. After that wipe all surfaces with white vinegar. Keep a bottle of Windex handy. You can zap them with that, too. Throw away all old foodstuff and check everything thoroughly. They will get into rice, even with a screwcap. If there are no visible larvae or moths, you can put your cereal, rice, etc. in the freezer for 5 days to be sure. Then you can buy pantry moth traps such as by "Catchmaster" or "Pro-Pest". Non-toxic Aunt Norma's Pantry Moth Spray is apparently a good cleaner. You could make your own out of white vinegar and "Easyclean" from Brewer's Emporium. It is a few dollars for a small can and it is non-toxic. You only need one teaspoon of the powder per pint of vinegar. Also I heard of putting out bay leaves and mint oil, around the food pantry.
Also they will come into your house as larvae or even grown moths. I once freaked out, when I bought some brown basmati rice and there were live and dead pantry moths (also called Indian Meal Moths) inside the rice when I opened the sealed packet !! They must have hatched on route to the store. After the clean out and discard of old foodstuffs, double bag everything with ziplock bags also. Cereal, nuts, flour, dry fruit, etc., especially.