Swallow bugs are very similar to bedbugs, but have a few distinguishing characteristics:
- Small size. These specimens were about 3 mm long.
- Long hairs; hair length longer than width of eyes.
- The fourth (terminal) antennal segment is about the same length as the third antennal segment.
In this case, they were found in an upper loft area. Hopefully we will get more information on what birds are nesting on the structure.
For detailed biology, see The life history and ecology of the cliff swallow bug, Oeciacus vicarius.