Oeciacus vicarious bed bugs were collected from 32% of Hirundo rustica nests and 83% of Petrochelidon pyrrhonota nests on bridges in western Colorado in December 1984. A total of 409 bugs (158 adults and 251 juveniles) were counted in 47 nests, two months after the hosts had departed for the winter.
Orr, Thomas and McCallister, Gary
"American swallow bug, Oeciacus vicarius Horvath (Hemiptera: Cimicidae), in Hirundo rustica and Petrochelidon pyrrhonota nests in west central Colorado,"
Great Basin Naturalist: Vol. 47:
2, Article 24.
Available at: https://scholarsarchive.byu.edu/gbn/vol47/iss2/24