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

AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 209
two specimens reported as T. latifascia by Fouquette and Rossman
(1963:199), are tentatively assigned to T. tau, pending completion
of a study of the tau group of Trimorphodon by Norman J. Scott
and the second author. All specimens were collected on the highway
at night.
Distribution in Sinaloa.—Foothills in north. See Fig. 87.
Specimens examined.—-16 km. NNE Choix, 520 m.('KU 68754); 22.1 mi.
N Culiacan (* CSCLB 553); near Terreros ("LACM 7112. 9510); 2.5 mi. N
Terreros (° LACM 7108); 5 mi. N Terreros (" LACM 7109); 7 mi. N Terreros
(°LACM 7111); 10 mi. N Terreros ("LACM 7110); 10.2 mi. S Terreros
(•LACM 7113).
Literature records.—8.3 mi. N Guacamil [Guamuchil]; 1.6 mi. S Guacamil
[Guamuehil] (Fouquette and Rossman, 1963:100).
Additional records.—15.5 mi. N Culiacan (FAS 16995); 29.9 mi. N Culiacan
(FAS 16996); 4 mi. NNE El Fuerte (FMNH 71531); 8 mi. NNE El Fuerte
(FMNH 71532-33).
Tropidodipsas annulifera Boulenger
Tropidodipsas annulifera Boulenger, Catalogue of the Snakes in the British
Museum (Natural History), 2:297, 1894 (based on a specimen of unknown
provenance).
Remarks.—One female and two males have smooth dorsal scales
in 15 rows without apical pits; 146, 149, 152 ventral s; 42, 44, 41 subcaudals;
6-6 supralabials; 7-7, 7-7, 6-7 infralabials; 1-1, 0-0, 0-0
preoculars; 2-2 postoculars; 1 + 2/1 + 2 temporals; anal entire (only
KU 75621); nasal divided; loreal and supralabials 3 and 4 enter the
eye; mental separated from chin shields; pupil vertically eliptjcal.
The dorsal coloration is black with eight and 12 lateral white spots
or rings (about two scales wide) anterior to the vent.
Most specimens were collected at night in July, during and immediately
after a hard rain, probably the first hard rain of the season.
One specimen (KU 75621) was found above ground in daylight
on July 15,1963.
Greer (1965b:237) reported T. malacodryas from the lowlands
north of Culiacan. Scott (1967:281) referred T. malacodryas Shannon
and Humphrey and four of the specimens reported as T. occidentalis
(UCLA 14640-43) by Campbell and Simmons (1962:198)
to T. annulifera.
Distribution in Sinaloa.—Occurs below 1200 meters in the lowland
thorn woodland and tropical deciduous forest in the southern
two-thirds of the state. See Fig. 87.
Specimens examined.—7 mi. S Escuinapa (LACM 7115); 16.2 mi. N
Espinal ("UCLA 14643); 10. 5 mi. N Mazadan (CSCLB 565); 13.7 mi. N
Mazadan ('UCLA 14642); 19.5 mi. N Mazadan (CSCLB 566); Santa Lucia,
1100 m. ('KU 75621).