The Amphibians and Reptiles of Sinaloa, Mexico - Smithsonian ...

150 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST.
tween femoral pores, 3-5 (4.1). The same characteristics for one
specimen (KU 48207) from Culiacan are respectively, 61, 192, 85,
—, 32, and 4. The foothill population is represented by three specimens
(KU 78885-87) from eight kilometers north of El Fuerte and
17 specimens (KU 78883-84, 78888-902) from six kilometers northeast
of El Fuerte that have the following characteristics, respectively:
55-70 (61.3); 195-214 (204.9) (except KU 78886, 78897);
86-100 (91.7) (except KU 78883-84, 78896); 35-41 (37.9) (except
KU 78893, 78896-97); 30-35 (32.2) (except KU 78897); and 2-4
(3.1) (except KU 78893).
Specimens from the lowlands have distinct stripes continuous on
the back. Specimens from the foothills have distinct light stripes,
but the vertebral and paravertebral stripes are broken and discontinuous
from the shoulders to the rump, giving a reticulated
appearance. Males of both populations have black chests and black
and white mottled chins. Females have immaculate chests and
bellies with small black specks on their chins. Young have orangish
tails. All of the females except one contain eggs (KU 78884 was not
examined for eggs). One female (KU 78891) with a snout-vent
length of 60 mm. has two eggs, each 16 mm. long. Another female
(KU 78898) with a snout-vent length of 57 mm. has two eggs 14 and
16 mm. long. In both cases the eggs are shelled and appear to be
mature. The testes of one male (KU 78892), with a snout-vent
length of 65 mm. contain sperm. Sinaloan specimens of C. tigris are
much smaller than specimens of Cnemidophorus tigris aethiops from
Sonora. John W. Wright and Charles H. Lowe, Jr., are currently
studying these populations of C. tigris.
Distribution in Sinaloa.—This species inhabits the lowland thorn
forest north of Culiacan and the foothills of the Rio Fuerte drainage.
See Fig. 50.
Specimens examined.—1.5 km. NW Culiacan (*KU 48207); 8 km. N
El Fuerte ( a KU 78885-87); 6 km. NE El Fuerte, 150 m. {"KU 78883-84,
78888-902); San Miguel, 110 m.