Richard C. Froeschner, Contributions to a Synopsis of the Hemiptera of Missouri, Pt. IV Hebridae, Mesoveliidae, Cimicidae, Anthocoridae, Cryptostemmatidae, Isometopidae, Meridae, The American Midland Naturalist, Vol. 42, No. 1 (Jul., 1949), pp. 123-188
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Richard C. Froeschner (1949) studied this question.
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