Beardsley Jr., J.W., & Gordh, G. 1988 A new Parechthrodryinus Girault, 1916 attacking Xylococculus Morrison, 1927 in California, with a discussion of the host relationship (Hymenoptera: Encyrtidae; Homoptera: Margarodidae).. Proceedings of the Hawaiian Entomological Society. (Hawaii Institute of Tropical Agriculture and Human Resources, Journal Series No. 3109(28)): 161-168.

Notes: Abstract: Description of parasite of Xylococculus macrocarpae; first record of encyrtid attacking representative of Xylococcinae, primitive subfamily of margarodid.