Kawai, S., & Takagi, K. 1971 Two subterranean species of the Ortheziidae found in tea gardens in Japan (Coccoidea: Ortheziidae).. Applied Entomology and Zoology. Tokyo 6: 112-118.

Notes: Describes Newsteadia kanayana new sp.; further description of Nipponorthezia ardisiae recorded from tea for the first time.