Pale dorsal stripe on fleshy portion of each finger, those of second and fourth fingers continuous to mid-humeral region, those of other fingers broken on anterior face of antebrachium; upper and lower pale stripes of antebrachium joined in mid-humeral region. _Coloration of living specimens._--Ground color of soft parts dark olive to slate gray or black; ground color of carapace olive to slate gray; ground color of plastron pale yellow, markings blackish, tinged with brown in younger specimens, sooty black in most adults. Postorbital mark red; other markings on soft parts cream to buffy yellow. _Geographic range._--_Pseudemys scripta taylori_ is known only from ponds, and the Río Chiquito in the basin of Cuatro Ciénegas. The discovery of _taylori_ brings to six the number of valid subspecies of _scripta_ known in México (_elegans_, _gaigeae_, _hiltoni_, _nebulosa_, _ornata_, and _taylori_) and to three (_elegans_, _gaigeae_, and _taylori_) the number known in Coahuila. My own studies of these six subspecies indicate that they are, beyond reasonable doubt, members of a single polytypic species (_scripta_). I tentatively follow Williams (1956:153) in rejecting "_cataspila_" as an invalid name. Three specimens of _Pseudemys scripta_ obtained by Robert G. Webb in the Río Chiquito at a point 8 mi. W of Nadadores, 2100 ft., where the river flows out of the basin of Cuatro Ciénegas, have many characteristics in common with _taylori_, but resemble _elegans_ closely in several characters as follows: no extensive melanism; plastral markings tending to be brownish; anterior plastral markings smudgelike, isolated or nearly isolated; markings on lateral scutes tending to have vertical, linear arrangement; cutting edge of mandible weakly serrate; femoral edges of plastron not reflected ventrally; one or more fine, pale lines between two major stripes on antebrachium; gular longer than pectoral in one specimen, longer than femoral in both specimens. The nature of these specimens suggests that parts of the Río Salado drainage north and east of Cuatro Ciénegas are in a zone of intergradation between _taylori_ and _elegans_. I have examined what I consider to be typical examples of _P. s._ _elegans_ from the region of Múzquiz (CNHM 28843-45, 55625-45), and from Don Martín Reservoir (KU 33524). These localities are, respectively, approximately 70 miles north-northeast and 100 miles east-northeast of Cuatro Ciénegas. The specimens from Múzquiz are presumably the same that Carr (1952:262) treated as "... _elegans-cataspila_ intergrades, but with a strong leaning toward eastern _elegans_...." Populations of _P. scripta_ in central eastern Coahuila (between the above-mentioned localities and Cuatro Ciénegas) probably are a conglomerate of only two subspecies (_elegans_ and _taylori_), not including _gaigeae_ (as was suggested by Hamilton, 1947:65 and by Carr, op. cit.:241, map 17;262).