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Cooper, D.D.; Cranshaw, W.S. 1999, The natural enemy complex associated with pine needle scale, Chionaspis pinifoliae (Fitch) (Homoptera: Diaspididae), in north central Colorado. Journal of the Kansas Entomological Society 72(1):131-133
Howard, L.O. 1881, (In Comstock, J.H. - Report of the entomologist for 1880.) Report of the parasites of Coccidae in the collections of the U.S. Department of Agriculture Part III. Report. United States Department of Agriculture. Washington. (Entomology) 1880:360
(Parasitoid identification correct)