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

82 UNIVERSITY OF KANSAS PUBLS., MUS, NAT. HIST.
tion of tubercles in a broad band on the back of males are present
in the Sinaloan toads examined. The males may have a narrow
middorsal line or none at all.
Nearly all specimens were found on the road at night during or
just after a rain. Most females were taken in the first two weeks of
July and contained eggs. No males were heard vocalizing nor were
any amplexing pairs seen.
Distribution in Sinaloa.—Although much more common in the
southern part of the state, Bufa marrnoTeus occurs throughout the
lowlands up to 400 meters. See Fig. 21.
Specimens examined.—Chupaderos (CSCLB 1840); 2 mi. W Chupaderos
(CSCLB 1841); 3 mi. W Chupaderos (CSCLB 1842); 4 mi. W Chupaderos
(CSCLB 1843); 4.5 mi. NE Concordia (LACM 6129); 4.7 mi. NE Concordia
(CSCLB 1783-84); 29.2 mi. NW Culiacan {LACM 6136); 54 mi. SE Culiacan
(UAZ 11630-31, 11782); 51 km. SSE Culican ("KU 37644); 13.4 mi. N (hwy.
15) Bio Elota (LACM 6137); 0.5 mi. S Espinal (CSCLB 1778-79); 3 mi. S
Espinal (CSCLB 1780); Matatan, 170 m. ("KU 73796); 55 mi. N Mazatlan,
Rio Piaxtla (CSCLB 1785, 1844-15); 4 mi. N San Bias, 400 ft (JRM 1125);
San Ignacio, 210 m. ('KU 73797-98; LACM 6130, 6132-33); 6.8 mi. N (on
hwy. 15) turnoff to San Ignacio (LACM 6131); 16 mi. N (on hwy.-15) tumoff
to San Ignacio (LACM 6134-35); 2 km. ENE San Lorenzo ( e KU 47925-44);
24.7 mi. NE Villa Union (CSCLB 1772-77); 26 mi. NE Villa Union (CSCLB
1781-82).
Literature records.—Mazatlan (Kellogg 1932:60; Martin del Campo, 1941:
760; Smith and Taylor, 1948:45); Rosario (Kellogg, 1932:60; Smith and Taylor,
1948:45).
Additional records.—7.8 mi. S Rio Baluarte (CAS 99627-28); 7-8 mi. N
Culiacan (FAS 12531); 63-68 mi. S Culiacan (FAS 12793); 16-18 mi. NW
Culiacan (AMNH 67944-15); 78 mi. N Mazatlan (CAS 99436); 49 mi. NNW
Mazatlan, nr. Rio Piaztla (AMNH 67946-47); Rosario (UIMNH 62582-85);
3 mi. SE Rosario (UIMNH 7546-50); Villa Union, Rio Presidio (UMMZ
102620).
Bufo maz all anens is Taylor
Bufo mazathnensis Taylor, Univ. Kansas Sci. Bull., 26:492, November 27,
1940 (type locality, two miles east of Mazatl&n, Sinaloa).
Remarks.—See Zweifel (1960:93) for a brief summary of the
taxonomy of Bufo mazatlanensis. It is variable in dorsal coloration
and tubercle size throughout its range, but no detailed study of
geographic variation has been completed.
Specimens were taken in both the wet and dry seasons. Calling
males were found on July 29, in roadside ponds north of Mazatlan.
The males usually call from the bank of the pond at the waters
edge. A few females were collected on the road that same night
but none were noted near the water. The first amplexing pair was
collected about 8 days later near Villa Union. Choruses were heard
throughout July and August and amplexing pairs were observed as