Trichiosoma triangulum pupae have previously been found only beneath the ground. However, a pupa of T. triangulum was collected from a sapling in Michigan in the Fall of 1971. This find may indicate a need to revise the life history as it is now understood.
Proceedings of the Iowa Academy of Science
©1973 Iowa Academy of Science, Inc.
Burch, Betty J.
"Notes on the Pupation of the Sawfly, Trichiosoma triangulum (Hymenoptera),"
Proceedings of the Iowa Academy of Science, 80(2), 59-59.
Available at: https://scholarworks.uni.edu/pias/vol80/iss2/7