longitudinal ridges on the plastron are indistinct or wanting and the
bridge forms a lesser angle with the horizontal plane of the plastron.

The largest female of _taylori_ (218 mm.) is shorter by some 30 mm.
than the smaller female in the series of _ornata_ from Tamaulipas
whereas the largest male of _taylori_ (179 mm.) is shorter by some
80 mm. than the smaller male from Tamaulipas. _Pseudemys s. taylori_
probably is smaller, on the average, than either _elegans_ or northern
populations of _ornata_.

There seems to be no reliable published record of the color of
the postorbital mark in living examples of _P. s. ornata_ from
Tamaulipas. Williams (1956:147, 154) indicated that this color may be
red or yellow for Mexican and Central American populations of _ornata_
in general and Guenther (1885: Pl. 6 b) indicated that the color
was yellow in _Emys cataspila_; however, both of the observations
mentioned were presumably based on preserved rather than living
specimens. The postorbital marks of a live specimen of _ornata_
(KU 40131) from southern Veracruz were yellowish to buffy with a
pinkish tinge anteriorly (_fide_ notes of Robert G. Webb and a color
photograph by him).

[Illustration: FIG. 3. Relative height of shell (expressed
as a percentage of width) and relative width of posterior
plastral lobe (expressed as a percentage of plastral length)
in two subspecies of _Pseudemys scripta_. The data presented
are for 62 specimens (40 [Female], 22 [Male]) of _P. s.
taylori_ and 37 specimens (13 [Female], 24 [Male]) of _P. s.
elegans_. Horizontal and vertical lines represent the mean
and range, respectively, whereas open and solid rectangles
represent one standard deviation and two standard errors of
the mean, respectively.]

[Illustration: PLATE 9
_Pseudemys scripta taylori_ new subspecies: dorsal view of
holotype (KU 46952), approximately 11/16 natural size.]

[Illustration: PLATE 10
_Pseudemys scripta taylori_ new subspecies: ventral view of
holotype (KU 46952), approximately 11/16 natural size.]

[Illustration: PLATE 11
Paratypes of _Pseudemys scripta taylori_ new subspecies:
_Left_--dorsal and ventral views of KU 46943, male, 16 km. S
Cuatro Cienegas, x 3/8; _Upper right_--KU 46974, juvenile, 6
mi. W Cuatro Cienegas, x 5/6; _Lower right_--KU 46968, male,
16 km. S Cuatro Cienegas, x 3/8.]

[Illustration: PLATE 12
V