Lindroth, C.H. 1931 [The island insect fauna and their problems.] Die insektenfauna Islands und ihre probleme.. Sonderabdruck aus Zoologiska bidrag fran Uppsala Band 13: 1-599.

Notes: Among species mentioned are Trionymus thulensis, T. incertus, Phenacoccus venustus, Orthezia cataphracta and Eriococcus granulatus.