_G. olivacea_ is obviously closely related to _G. carolinensis_; the differences are not greater than those to be expected between well marked subspecies. Nevertheless, in eastern Oklahoma and eastern Texas, where the ranges meet, the two kinds have been found to maintain their distinctness, differing in coloration, behavior, calls, and time of breeding. Hecht and Matalas (1946: 2) found seeming intergrades from the area of overlapping in eastern Texas, but some specimens from this same area were typical of each form. Their study was limited to preserved material, in which some characters probably were obscured. More field work throughout the zone of contact is needed. The evidence of intergradation obtained so far seems to be somewhat equivocal. Besides _G. olivacea_ and typical _G. carolinensis_ there are several named forms in the genus, including some of doubtful status. The name _mazatlanensis_ has been applied to a southwestern population, which seems to be a well marked subspecies of _olivacea_, but as yet _mazatlanensis_ has been collected at few localities and the evidence of intergradation is meager. The names _areolata_ and _texensis_ have been applied to populations in Texas. Hecht and Matalas (1946: 3) consider _areolata_ to be a synonym of _olivacea_, applied to a population showing intergradation with _carolinensis_, but Wright and Wright (1949: 568) consider _areolata_ to be a distinct subspecies. _G. texensis_ generally has been considered to be a synonym of _olivacea_. Other species of the genus include the tropical _G. usta_, _G. elegans_ and _G. pictiventris_. Of the vernacular names hitherto applied to _G. olivacea_ none seems appropriate; I propose to call the species the Kansas ant-eating frog because of its range extending over most of the state, and because of its specialized food habits. The type locality, originally stated to be "Kansas and Nebraska" (Hallowell, 1856: 252) has been restricted to Fort Riley, Kansas (Smith and Taylor, 1950: 358). Members of the genus have most often been referred to as toads rather than frogs because of their more toadlike appearance and habits. However, this family belongs to the firmisternial or froglike division of the Salientia and the terms "frog" and "toad," originally applied to _Rana_ and _Bufo_ respectively, have been extended to include assemblages of related genera or families. Members of the genus and family usually have been called "narrow-mouthed" toads from the old generic name _Engystoma_, a synonym of _Gastrophryne_. _G. olivacea_ usually has been referred to as the Texas narrow-mouthed toad, or western narrow-mouthed toad. The latter name is inappropriate because the geographic range is between that of a more western representative (_mazatlanensis_) and a more eastern one (_carolinensis_). The names _texensis_, _areolata_ and _carolinensis_ have all been applied to populations in Texas, and it is questionable whether typical _olivacea_ even extends into Texas.