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

154 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST.
Boulenger (1893:16), and the illustration of the head plates by
Taylor (1940b:444). These specimens have been compared with
others of the same species from Ceylon, the Philippine Islands, and
Guerrero. The five snakes (KU 63416-18, 73487 and 82980) have,
respectively, 334, 307, 292, 309, 320, middorsal scales from the prefrontal
to the tail spine, snout-vent lengths of 103, 99, 69, 160, 94
mm., and tail lengths of 3, 3, 2.5, 4, 3 mm. All have 20 scales around
the midbody. The ratio of snout-vent length to total length is 0.97
in all specimens. All are brown dorsally with a lighter brown
venter; the snout, chin, anus, and tip of tail are white. Each dorsal
scale has a pale gray base which may be overlapped by the preceding
scale.
This small burrowing reptile has been introduced into Mazatlan
and Rosario and become well established. Three specimens (KU
63416-18) were unearthed by laborers digging near a trailer park in
Mazadan. Two other individuals (CSCLB 1147-48) were collected
at night on the grounds of the trailer park in July. Another specimen
(KU 734787) was found during the excavation of a flower bed.
Campbell and Simmons (1962:202) reported a specimen (UCLA
14693) found under a rock at the Mazatlan airport.
Distribution in Sinaloa.—Known only from the vicinity of Mazatlan
and Rosario. See Fig. 58.
Specimens examined.—Mazatlan (• KU 63416-18, 73487, 82980; CSCLB
1147-48).
Literature record.—Mazatlin (Campbell and Simmons, 1962:202).
Additional records.—Mazatlan (USNM 152455); 5 mi. N Mazatlan (AMNH
-85777); Rosario {AMNH 91604).
Family Leptotyphlopidae
Leptotyphlops humilis dugesii (Bocourt)
Catodon dugesii Bocourt, Bull. Soc, Philom. (7), 6:81, 1881 {type locality,
Colima).
Leptotyphlops humilis dugesii: Klauber, Trans. San Diego Soc. Nat Hist.,
9:129, April 30, 1940.
Remarks.—Klauber (1940:131) suggested that Leptotyphlops humMs
dugesii was most closely related to L, h. slevini, but that intergradation
of dugesii with L. h. humUis or L. h. tenuiculus might
eventually be disclosed. The dorsal counts for his specimens are
235-257 (242) with the northernmost locality represented being
Mazadan. Bogert and Oliver (1945:349) referred one specimen
from Alamos, Sonora, to dugesii on the basis of pigmentation and
a dorsal scale count of 257. Langebartel and Smith (1954:134)