1. Laboratory of Applied Entomology and Zoology, Faculty of Agriculture, Ibaraki University, Ami, Ibaraki, Japan
2. National Institute for Environmental Sciences, Tsukuba, Ibaraki, Japan
3. Nihon BioData Corporation, Kawasaki, Kanagawa, Japan
4. Faculty of Economics, Ryutsu Keizai University, Ryugasaki, Ibaraki, Japan