The genera Citellinema and Warrenius were established by Hall in 1916 with regard to specimens collected from alcoholic host material supplied by Mr E. R. Warren. The genus Citellinema was founded upon a single male specimen from Citellus elegans, named by Hall Citellinema bifurcatum, in reference to the bifurcated spicules. The genus Warrenius was based upon two males, one headless, from Eutamias quadrivittatus, to which Hall gave the name Warrenius quadrivittatus.
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