Kuwana, S.I. 1928 The diaspine Coccidae of Japan. V. Genera Chionaspis, Tsukushiaspis [n. gen.], Leucaspis, Nikkoaspis [n. gen.].. Scientific Bulletin (Ministry of Agriculure and Forestry, Japan) 1: 1-39.

Notes: Descriptions and keys for 13 diaspidids; 5 new; notes on 4 others.