Specimens reported by Schmidt and Owens (1944:101) as _P. s. gaigeae_ (from several localities in the region mentioned above) have been examined in the course of my study and prove to be _P. floridana texana_. A specimen reported by Shannon and Smith (1949:399; IU 4094, Hidalgo Co., Texas) as being either _gaigeae_ or an _elegans-gaigeae_ intergrade, has been examined and is here regarded as a typical specimen of _elegans_. I regard _P. s. gaigeae_ as a subspecies of the upper Río Grande and disrupted parts of that drainage; the range of that subspecies meets that of _P. s. elegans_ somewhere between the Big Bend region and Piedras Negras. In any event, the influence of _gaigeae_ is not so widespread as other authors (Carr, _loc. cit._; Hamilton, _loc. cit._; Hartweg, 1939:3-4) have indicated. Further collecting in the Río Salado and its tributaries east and north of Cuatro Ciénegas will be necessary before the exact range of _P. s. taylori_ can be determined. _Variation._--Characteristics ascribed to the holotype pertain in general to all specimens in the hypodigm, except as noted below. The postorbital mark is in contact with the eye on one or both sides in 46 per cent of the specimens (narrowly separated from eye in remainder) and is in contact with a neck stripe (on one or both sides) in 35 per cent of the specimens. The pattern of the antebrachium is as shown in Fig. 2 in all specimens except that the thin lateral stripe is obliterated by melanism in older specimens of both sexes. The lateral edges of the posterior plastral lobe are reflected downward, at least slightly, in all but one specimen (an adult, kyphotic female). The first central lamina is straight-sided in juveniles and becomes urn-shaped only in adults. The relative height of the shell tends to increase with a general increase in size in both sexes. [Illustration: FIG. 1. _Pseudemys scripta taylori_ new subspecies: left side of head, female paratype (KU 46933), × 1.] [Illustration: FIG. 2. _Pseudemys scripta taylori_ new subspecies: anterior view of left antebrachium, female paratype (KU 46934), × 1.] _Comparisons._--Of the five other subspecies of Mexican _P. scripta_ mentioned above, three subspecies (_gaigeae_, _hiltoni_, and _nebulosa_) form a natural group herein referred to as the _gaigeae_ group. _Pseudemys s. taylori_ is distinguished from members of the _gaigeae_ group by elongate, red postorbital mark (yellow or orange in the _gaigeae_ group), extensive black plastral pattern (narrow--or if wide, brownish--in _gaigeae_ group), and serrate lower jaw (nearly smooth in _gaigeae_ group). The subspecies _P. scripta taylori_ differs from _P. scripta elegans_ as indicated in the following comparative list of characteristics: _P. s. taylori_ _P. s. elegans_