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

AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 93
Escuinapa (UF 16550); 15 mi. SE Escuinapa, Hacienda La Campana, 300 ft.
(UMMZ 118814 [5 spec.]); 9.1-14.1 mi. S Escuinapa (FAS 13956-60); 3.6
mi. E Cuasave (on Verdura road) (CAS 99033^2); W half La Cruz rd. (CAS
99653); Los Mochis (FAS 10639-43); 13 mi. NNE Los Mochis (UlMNH
40566-68); Mazatlan (USNM 153773-74); N Mazatlan (AMNH 13126); 1
mi. N Mazatlan (SM 9194-209); 1.8 mi. N MazatJan (UF 12854): 3 mi. N
Mazatlan (MCZ 32575-76; USNM 151798-801; 3.2 mi. N Mazatlan (CAS
99380); 4 mi. N Mazatlan (AMNH 6205-06); 5 mi. N Mazatlan (SM 12051-
55); 10 mi. N Mazatlan (MCZ 32573); 10.3 mi. N Mazatlan (CAS 99398);
10.4 mi. N Mazatlan (CAS 99399); 12 mi. N Mazatlan (UF 12855); 18 mi. N
Mazatlan (AMNH 59281); 21 mi. N Mazatlan (MCZ 32571-72); 24 mi. N
Mazatlan (MCZ 32565-70); 78.1 mi. N MazatJan (CAS 99437); 1 mi. E
Mazatlan (UIMNH 32769); 2.5 mi. E Mazatlan (FAS 8579); 0.4 mi. SE
Mazatlan (MCZ 32574); ca. 2 mi. SE Mazatlan (FMNH 105263; UIMNH
25394-403); 2 mi. SE Mazatlan (FMNH 112751, 112754, 112757, 117466-68,
117476, 117478, 117481-84); 2.3 mi. N, 1.5 mi. W Mazatlan (FAS 7734-43);
25 mi. NW Mazatlan (MCZ 32950); 5-8 mi. NNW Mazatlan, 50-100 ft.
(UMMZ 115302 [3 spec.]); 23.3 mi. NNW Mazatlan, 150 ft. (UMMZ 115303);
9 mi. NW Piaxtla (SM 11665-66, 12045-50); Rosario (UIMNH 7073, 62656-
64); 8 mi. WNW Rosario (UMMZ 112850-51); Villa Union, Rio Presidio
(UMMZ 102615); 3 mi. SE Villa Union (SM 12056-61).
Ptemohyla fodiens Boulenger
Ptemohyla fodiens Boulenger, Ann. Mag. Nat. Hist., ser. 5, 10:326, figs.,
juveniles) of Pternohyla fodiens from Sinaloa were compared with
three males of Pternohyla dentata Smith from Aguascalientes. In
addition to the characters that Smith (1957:1) listed as differentiat-
Remarks.—Thirty-nine specimens (32 males, two females, and five
October, 1882 (type locality, Presidio, W. Mexico).
ing the two species, males of Ptemohyla fodiens have black throats
speckled with white {white tips of the ventral granules), and the
paired vocal pouches are joined medially. The three males of P.
dentata have the vocal pouches darker in color than the belly but
paler than the light interspaces of the dorsum, and the pouches are
separated by the white throat skin, which is as granular as the belly.
The males, females and juveniles of P. fodiens have snout-vent
lengths of 38-62 (47.5), 60, 61, and 35-41 (38.8), and tibia lengths
of 15.0-23.6 (19.1), 24.0, 28.7, 14.8-16.4 (15.5), respectively. The
three males of P. dentata have snout-vent lengths of 52, 52 and 56
and tibia lengths of 18.7,18.8, and 20.0.
Males usually call from the base of bushes or in grass, well back
from the edge of the ponds. Amplexing pairs were collected on
August 20 near La Cruz. Tadpoles were collected the following
day from a pond eight to ten centimeters in depth. Thousands of
tadpoles, all of which appeared to be newly hatched and about
10 mm. in length, were all that remained from the previous night's
breeding activities. Most of the larvae were floating in clusters
with their tails directed downward at the surface of the pond.