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

AMPHIBIANS AND REPTH^ES OF SINALOA, MEXICO 173
14833); 12 mi. N Mazatian (MCZ 61418); 16 mi. N Mazatian (MCZ 61419);
18 mi. N Mazadan (MCZ 61420); 18.8 mi. N Mazatian (MCZ 61421); 26.4
mi. N Mazatian (UF 12804); 31 mi. N Mazatian (FAS 14776); 45 mi. N
Mazatian (FAS 16819); 46.6 mi. N Mazatian (FAS 14505); 15.3 mi. S San
Lorenzo, Rio (SU 23821).
Lampropeltis getulus nigritus Zweifel and Norris
Lampropeltis getulus nigritus Zweifel and Norris, Amer. Midland Nat.,
54:238, August 27, 1955 (type locality, 30.6 miles [by road] south of
Hermosillo, Sonora).
Remarks.—One specimen has been reported from Sinaloa (Campbell
and Simmons, 1962:196). Two additional specimens (CSCLB
1417, LACM 28715) are males and have 216, 221 ventrals; 46, 55
subcaudals in two rows; 23-23-19 dorsal scale rows; 8-8, 7-7 supralabials;
9-9 infralabials; 1-1 preoculars; 2-2, 1-2 postoculars; and
1 + 2, 2 + 3 temporals. The dorsum is black with a very small light
spot on many scales; the ventrals are black with one or two white
marks on each ventral, decreasing in area posteriorly; the subcaudals
are black with a few small light spots on the lateral edges.
The head, labials, neck, and gular area are black, and chin shields
are nearly all white. In coloration these specimens are similar to a
specimen from Arizona reported by Zweifel and Norris (1955:239-
40) as an intergrade between L. getulus nigritus, L. g. splendida,
and L. g. yumensis. The presence of an "intermediate" color pattern
in Sinaloa suggests that the race nigritus is much more variable
than previously understood and probably is nothing more than the
intermediate population or color phase between splendida and
yumensis. All specimens were collected at night on Mexican highway
15.
Distribution in Sinaloa.—Known only from the extreme northern
lowlands. See Fig. 60.
Specimens examined.—6 km. SE Los Mochis tumoff (LACM 28715); 25.6
mi. S Los Mochis (CSCLB 1417).
Literature records.—5.6 mi. S Sonora-Sinaloa state line (Campbell and Simmons,
1962:196).
Lampropeltis triangulum nelsoni Blanchard
Lampropeltis triangulum nelsoni Blanchard, Occ. Pap., Mus. Zool., Univ.
Michigan, 81:6, fig. 1, April 28, 1920 (type locality Acambaio, Guanajuato).
Remarks.—The 13 specimens examined include eight males, three
females, and two specimens of unknown sex. The eight males have
217-230 (220.6) ventrals; 49-56 (53.7) subcaudals (excluding KU
73537); 10-13 (12.0) white bands on the body; and 3-4 (3.9) white