In the years since the thurberia weevil, Anthonomus grandis thurberiae Pierce, was described, attempts to separate it from the boll weevil, A. g. grandis Boheman, by using the characters noted by Pierce have met with indifferent success. In an intensive study of specimens clearly representative of the 2 named subspecies of grandis, 3 characters were found to distinguish thurberiae from grandis, namely, curvature of the setae of the pronotum, sculpture of the metepisternum, and shape and sculpture of the scutellum. When these characters were used to define the limits of distribution of thurberiae and grandis, not only was the distribution of the 2 weevils revealed, but also some populations were found to differ from typical forms of both. The name Anthonomus grandis grandis is used for the boll weevil of the Southeastern United States; the thurberia weevil is Anthonomus grandis thurberiae; and the intermediate form, wherein the holotype of grandis falls, is called simply “intermediate.” The data from an examination of more than 4000 specimens are grouped according to geographical areas, and the combined frequency data of the 3 characters of Anthonomus grandis sspp. within the populations show the percentages falling into thurberiae, intermediate, and grandis.