Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
Karpinski, J. J. 1933a. Dwa naturalne bastardy z rodzaju Pityophthorus Eichh. [Les deux bastards naturels du genre Pityophthorus Eichh.]. Polskie Pismo Entomologiczne 12:290-302, pls. XVIII-XXI.