Larvae of Callibaetis pretiosus were collected from a wet-weather pool in Monroe County, Pennsylvania. This record represents a significant northward increase in the known distribution of this species which had previously been reported only from Alabama, Florida, Georgia, North CarolIna, Tennessee, Texas, and Virginia.
Waltz, R. D. and Munro, James B.
"Callibaetis Pretiosus (Ephemeroptera: Baetidae) From Pennsylvania: New Distribution Record,"
The Great Lakes Entomologist, vol 29
Available at: https://scholar.valpo.edu/tgle/vol29/iss1/6