New to the neighborhood and have already found two black widow spiders around the yard over the last month. One was on the kids swing set and the other was across the yard in a shed that was only built a month ago. What I saw and killed was the northern black widow which has a row of red spots down the middle of the upper surface of its abdomen and two crosswise bars on the undersurface. The markings can also be yellow or white, and the spider itself may be brown or have red legs. Anyone else seen them in their yard?