local population of this subspecies the characters seem to be
remarkably uniform and stable.

* * * * *

Illustration: FIG. 2. Diagrammatic drawing of pattern in stretched
skin of _T. s. fitchi_; the pale markings on the black dorsolateral
area are scarlet (x 2-1/2).

* * * * *

Illustration: FIG. 3. Diagrammatic drawing of stretched skin of
_T. s. parietalis_; the scarlet markings extend farther dorsally
than in _T. s. fitchi_ and black spots are prominent on the ventrals
laterally. Some individuals of _parietalis_ have much paler ground
color, resembling _ornata_ except in minor details (x 2-1/2).

* * * * *

Illustration: FIG. 4. Diagrammatic drawing of stretched skin of
_T. s. ornata_. The ground color is like that of _parietalis_ but
paler with a continuous black area bordering the dorsal stripe (x
2-1/2).

* * * * *

_T. s. parietalis_ differs from _fitchi_ in several trenchant
characters, and there are additional slight or average differences
between the two. In approximate order of their importance the
differences are as follows: 1) The red (or pale yellow or green or
buffy) marks on skin between the scales on the upper half of the
dorsolateral area (that is between the sixth and seventh, seventh and
eighth and eighth and ninth scale rows) present in _parietalis_ are
missing in _fitchi_ or are represented by only an occasional small
fleck. 2) The dorsolateral area is black or nearly so in _fitchi_ but
averages paler in _parietalis_, in which a wide range of shades may be
found from black to olive brown. 3) The red of the dorsolateral area
frequently invades the lateral stripe, which sometimes is mostly red,
and may even invade the ventrals in _parietalis_, but in _fitchi_ the
red marks are usually confined to the dorsolateral area, and do not
invade the lateral stripe. 4) The prominent paired black dots
or semicircular marks on the anterior edge of each ventral in
_parietalis_ are largely lacking in _fitchi_, which rarely has any
dark marks on the ventral surface. 5) The dorsal stripe consistently
involves the middorsal scale row and the adjacent half of the next row
on each side, and is bright yellow in _fitchi_, but in _parietalis_
it may be slightly wider, may be duller with more dusky suffusion, and
its edges may be less sharply defined.

INTERMEDIATE AND ATYPICAL POPULAT