Ohgushi, R., & Miyasita, E. 1963 Studies on the local variation of age distribution of the overwintering arrowhead scale, Prontaspis yanonensis Kuwana in Nagasaki Prefecture.. Japanese Journal of Applied Entomology and Zoology 7(4): 291-299.

Notes: The distribution, mortality and the development of ovaries of overwintering arrowhead scale, Prontaspis yanonensis collected from 26 stations of Nagasaki Prefecture were examined.