Takagi, S., & Kawai, S. 1967 The genera Chionaspis and Pseudaulacaspis with a criticism on Phenacaspis (Homoptera: Coccoidea).. Insecta Matsumurana (New Series) 30: 29-43.

Notes: C. kosztarabi n. sp.; Phenacaspis n. syn. of Chionaspis; North American and some Asatic spp. of Phenacaspis form aggregate of dimorphic forms of Chionaspis; some species of Phenacaspis transferred to Pseudaulacaspis.