I need help identifying what type of bee/wasp is in my house. I am leaning towards a wasp because one of the two was knocked down by my cat and after I pined the insect down, a very distinguishable singer could be seen. The second insect appeared two days later. I am extremely anxious because of their resemblance to a bald faced hornet. My house is from the 1930's and doesn't have insulation between the exterior walls, creating an ideal conditions for a colony. Please help if you can.