re than any other person to our present knowledge of
the herpetofauna of Mexico.

=Pseudemys scripta taylori= new subspecies

(Pls. 9-12, Figures 1 & 2)

_Holotype._--Univ. Kansas Mus. Nat. Hist., No. 46952, adult female,
alcoholic; 16 km. S Cuatro Cienegas, Coahuila, Mexico; 6 September
1958; original number 1694 John M. Legler.

_Paratypes._--A total of 52 specimens as follows (numbers or series
of numbers marked with an asterisk are for specimens prepared as dry
shell with soft parts in alcohol): KU 46932-4*, 46949-51, 46953-67,
46969 (females), 46935*, 46936-48, 46968 (males), same data as
holotype, 6 to 8 September 1958; UU 3416 (male), same locality, 29 to
30 July 1959; KU 46971, 46973* (females), 46972 (male), 46970, 46974
(juveniles), 6 mi. W Cuatro Cienegas, 3 to 6 September 1958; IU 43585,
43587-9 (females), 43586, 43590 (males), same locality, 11 July 1958;
CNHM 55655 (female), same locality, 22 August 1939; KU 46976 (female),
Rio Chiquito, 10 km. S Cuatro Cienegas, 9 September 1958; UU 3415
(female), 8.5 mi. SW Cuatro Cienegas, 1 August 1959.

_Diagnosis._--A subspecies of _Pseudemys scripta_ most closely
resembling _P. s. elegans_, but differing from that subspecies in
having: 1) extensive _black_ plastral pattern, all parts of which are
interconnected, covering approximately half of plastron; 2) tendency
toward melanism, in large adults of both sexes, especially noticeable
on posterior part of plastron; 3) cutting edge of lower jaw coarsely
serrate; 4) tendency for femoral edges of plastron to be reflected
ventrally, especially in males; and, 5) pectoral scute longer than
gular.

_Description of holotype_ (measurements given in Table 1).--Carapace
oval in dorsal aspect, slightly narrowed behind, nearly straight
across anterior margin, bluntly serrate behind; shell deep, highly
arched in cross section; height of shell 53 per cent of width; surface
of shell having longitudinal striations; middorsal keel weakly
developed, scarcely discernible except on third central lamina;
lateral margin of carapace not at all reflected, posterolateral
margins flared outward; central laminae all broader than long, the
first urn-shaped.

TABLE 1. MEASUREMENTS (IN MILLIMETERS) OF THE HOLOTYPE
(46952) AND NINE ADULT, TOPOTYPIC PARATYPES OF PSEUDEMYS
SCRIPTA TAYLORI NEW SUBSPECIES. HEIGHT WAS MEASURED IN A
VERTICAL LINE FROM THE CENTER OF THE PLASTRON.

KEY: