Abstract
Euurobracon yokahamae (Dalla Torre, 1898) is interpreted as an endangered species (Level II) in the Red List of Kanagawa Prefecture. However, over the last ten years, eyewitness accounts and collecting records of the species have been increasing, especially on chestnut trees and surrounding coppices. Its hosts have long been considered to be larvae and pupa of Batocera lineolata and larvae of Massicus radddei. In this study, it is clarified that E. yokahamae infested the pupa of M. raddei, based on such remains as head capsules and normally molted outer peels of the hosts.
