Moth fly (Diptera: Psychodidae)

7136.      These small flies are plentiful in our finished basement. They don’t live long, and are mostly dust when you squish them. They only came out recently, I.e. Oct. Nov 2020. Not sure what they are or where they have come from. Can you help? Barrie, On. Canada

Number 7136. This is a moth fly (Diptera: Psychodidae). Also known as drain flies or sewer flies, their larvae feed on decomposing organic matter and are often found in floor drains, seldom-used commodes, and the like. Although they can be nuisances, they do no real harm, and chemical control seldom is required. Click here for some other suggestions.