7041.         Have been chasing these around for days. Cannot figure out where they are coming from and how to get rid of them. Thought they came from outside, but the house has been mosquito net proofed for days now. Raid Home did not really help. Montreal, Quebec. Canada

Number 7041. You must live near a body of water (stream/pond/lake) as this appears to be a caddisfly (order Trichoptera) that has lost most of its wing scales – Click here for an example of an intact specimen. Their larvae are aquatic, and most species construct tubular cases that they live in. These are completely harmless, and will do no damage.