llow spurs on posterior surface of thigh,
inner spur approximately half the size of outer. Head relatively
wide, greatest width of skull slightly more than 80 per cent of
condylobasilar length; width of head 1.3 to 1.7 times diameter of
hind foot; scales on top of head large but irregularly arranged
(see table 1 for measurements of type and paratypes).

TABLE 1. Measurements, in Millimeters, of the Holotype and Paratypes
of Gopherus Flavomarginatus New Species

----------------+--------+--------+--------+------+---------+------
Catalogue Number|Length |Width |Length | |Diameter |Width
and Collection |of |of |of |Height|of |of
|carapace|carapace|plastron| |hind foot|head
----------------+--------+--------+--------+------+---------+------
USNM 60976 | 246 | 212 | 252 | 108 | 31 | 41
----------------+--------+--------+--------+------+---------+------
USNM 61253 | 222 | 166 | 212 | 96 | 21 | 36
----------------+--------+--------+--------+------+---------+------
USNM 61254 | 371 | 292 | 358 | 157 | 43 | 55
----------------+--------+--------+--------+------+---------+------
IU 42953 | 281 | 220 | | | |
----------------+--------+--------+--------+------+---------+------
IU 42954 | 278 | 214 | | | |
----------------+--------+--------+--------+------+---------+------
KU 39415 | 303 | 232 | | | |
----------------+--------+--------+--------+------+---------+------

Duges (1888:146-147, and 1896:479) twice reported specimens of
_Gopherus polyphemus_ from Chihuahua (see discussion of distribution);
his description of two living examples (1888) agrees generally with
the above description of _G. flavomarginatus_. He stated that the
iris of his smaller specimen was yellow and the iris of a larger
specimen brown.

It will be most interesting to learn the color of juveniles of _G.
flavomarginatus_. Considering the dark color of the epidermal
areolae of adults, I would expect the color of hatchlings to be
dark brown to nearly black, with each lamina acquiring paler
borders as it grew, rather than acquiring darker borders as is
usually the case in _G. berlandieri_ (personal observation),
_agassizii_ (Miller, 1932:194, p