Basin. In
characters of scutellation specimens from the east are intermediate
between _C. sacki sacki_ and _C. sacki zweifeli_ in the Tepalcatepec
Valley. However, in coloration the lizards from the east are like
those from the Tepalcatepec Valley, but differ distinctly from the
nominal subspecies. Therefore, the eastern series is referred to the
subspecies _C. sacki zweifeli_.

_Comparisons._--Four other species of _Cnemidophorus_ occur in the
Tepalcatepec Valley with _Cnemidophorus sacki zweifeli_. Of these, _C.
calidipes_ has a maximum snout-vent length of 79 mm., 66 to 86 dorsal
granules, and a light brown dorsum with pale blue spots and vertical
bars; _C. communis communis_ has a maximum snout-vent length of 135
mm., 105 to 144 dorsal granules, and a greenish tan dorsum with yellow
spots; _C. deppei infernalis_ has a maximum snout-vent length of 84
mm., 91 to 120 dorsal granules, and a striped pattern throughout life;
and _C. lineatissimus exoristus_ has a maximum snout-vent length of 98
mm., 108 to 135 dorsal granules, and a middorsal yellow stripe and
vertical bars on the flanks. Both _calidipes_ and _communis_ are like
_sacki_ in possessing four enlarged supraoculars and enlarged
postantebrachials, whereas _deppei_ and _lineatissimus_ have three
enlarged supraoculars and granular postantebrachials. Juveniles of
_calidipes_ and _sacki_ are alike in coloration but different in the
extent of the supraorbital semicircle-series. In _calidipes_ the
supraorbital semicircle-series usually are complete, whereas in
_sacki_ the series never extended anterior to the posterior edge of
the frontal.

~Table 1.--Variation in the Number of Dorsal Granules
in Three Subspecies of Cnemidophorus sacki~

Key for Table:
No. = Number of Specimens SD = Standard Deviation
SE = Standard Error C/V = Coefficient of Variation

/======================================================================\
| ~Population~ | No. | Range | Mean | SD | SE | C/V |
|--------------------------+-----+---------+------+------+------+------|
|_sacki sacki_ | | | | | | |
| Entire Sample | 106 | 88-105 | 96.3 | 4.16 | 0.40 | 3.92 |
| Puebla: Tehuitzingo | 22 | 88-103 | 95.1 | 4.18 | 0.89 | 4.39 |
| Guerrero: Chilpancingo | 23 | 90-105 | 95.8 | 3.86 | 0.80 | 4.02 |
| Guerrero: Mexcala | 22 | 90-102 | 96.5 | 3.56 | 0.76 | 3.69 |
| Morel