The juvenal pattern commonly consists of whitish tubercles or dots (_T. s. emoryi_, _T. s. guadalupensis_, _T. s. pallidus_, _T. ater_), large black ocelli (_T. s. spinifer_), small black dots and ocelli (_T. s. hartwegi_, _T. s. asper_), large dusky spots or ocelli (_T. m. calvatus_), or small dusky dots or short streaks and dashes (_T. m. muticus_). Some hatchlings of _pallidus_ and _emoryi_ have a uniform pale brown or tan carapace; hatchlings of _T. ferox_ have a distinctive pattern (Pl. 31). Further comments and illustrations pertaining to kind of pattern on the carapace are offered under the accounts of species and subspecies. _Pattern on Dorsal Surface of Snout (Fig. 5)_ _T. ferox_ has pale stripes on a dark background that unite in front of the eyes; the dark ground color becomes paler with increasing size, but the stripes retain thick black borders. _T. m. muticus_ has ill-defined, pale stripes that are evident just in front of the eyes and do not extend anteriorly to unite in front of the eyes, whereas _T. m. calvatus_ lacks pale stripes on the snout. The kind of pattern on the dorsal surface of the snout that is characteristic for each of the subspecies of _T. spinifer_ has been mentioned in the discussion of clinal variation. _Pattern on Side of Head (Fig. 6)_ _T. ferox_ has a pale broad, postocular stripe in contact with the orbit or not, and other pale marks on a dark background; the ground color becomes paler with increasing size, but the stripes and other marks retain thick black borders. _T. m. muticus_ usually has an uninterrupted, dusky-bordered, postocular stripe, whereas _T. m. calvatus_ (in adult males only) has pale postocular stripes with thick blackish borders. The pattern on the side of head that is characteristic for each subspecies of _T. spinifer_ has been mentioned in the discussion of clinal variation. _Pattern on Dorsal Surface of Limbs (Fig. 7)_ Young specimens of _T. ferox_ have pale marks on a blackish background. As growth proceeds the distinctive contrasting pattern is obliterated and eventually is replaced by a uniform grayish coloration in large adults. The pattern on the limbs of _T. muticus_ is not contrasting, and is almost a uniform grayish, consisting of fine, pale markings. The clinal variation in pattern and kind of pattern on the limbs of the subspecies of _T. spinifer_ has been mentioned in the discussion of clinal variation. Dark markings tend to form streaks that are coincident with the digits, and larger markings occur on the hind limbs than on the forelimbs. _Marginal Ridge_