Three specimens from the Brazos River drainage are particularly impressive in their alliance with _guadalupensis_. SM 2556, an adult male, has large white dots that are encircled with black ocelli on the posterior half of the carapace, but lacks white dots on the anterior half. TNHC 14068, a hatchling, has small black dots interspersed with the larger white dots posteriorly. CNHM 46289 has large white spots on the carapace that are surrounded with two to four black dots; scattered black dots also intermix with white spots on the surface of the carapace (less extensive anteriorly). Color notes taken from a freshly-killed adult male (KU 47121) from the Brazos River, seven miles below Whitney Dam, Bosque-Hill county line, Texas, are: Carapace pale brown or tan bordered by black line, having pale lemon yellow rim; yellowish-cream spots on carapace faintly surrounded with black stippling; dorsal surface of soft parts of body olive having black marks and patches of grayish; webbing on limbs having golden or yellowish hue, brighter distally; interorbital region brown; black-bordered, postocular stripe orange-cream; snout and side of head olive having pale areas of orange-cream; iris cream having black stripe; yellowish at juncture of dark dorsal and pale ventral coloration with orangish tinge on forelimbs and head; tail pale brown or tan, flanked by black borders that suffuse laterally into lemon-yellow; undersurface whitish, pale yellow on neck, bluish-gray on throat. _Comparisons._--_T. s. pallidus_ most closely resembles _T. s. guadalupensis_, but can be distinguished from that subspecies in having small white tubercles, rarely two millimeters in diameter, on a pale background, that are not surrounded by blackish ocelli, and are usually absent, or not conspicuous on the anterior third of the carapace in adult males; also there are usually no conspicuous white tubercles or dots on the anterior third of the carapace in hatchlings. Many adult males of _pallidus_ from the Brazos and some from the Trinity River drainages often have dusky or black ocelli surrounding the white dots posteriorly on the carapace; males from these river systems may be distinguished from _guadalupensis_ in having most, if not all, white dots on the anterior half of the carapace smaller than those posteriorly, and a pale brown carapace (in life, usually darker in _guadalupensis_). _T. s. pallidus_ (and _guadalupensis_) is distinguished from _emoryi_ in lacking a widened pale rim posteriorly, and in having small white spots on the anterior half of the carapace. _T. s. pallidus_ resembles _guadalupensis_ and _emoryi_ in having white spots on the carapace in adult males. _T. s. pallidus_ differs from _spinifer_, _hartwegi_ and _asper_ in lacking blackish dots or ocelli that occur in the center of the carapace. _T. s. pallidus_ resembles _emoryi_ but differs from _guadalupensis_ in lacking black ocelli surrounding the white spots. _T. s. pallidus_ resembles