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

112 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST.
Phyllodactylus homolepidurus outside of the "rock outcroppings of
sandstone, schist, and granite within a 130 mile radius of Heimosillo,
Sonora." Three specimens examined by us are from northern Sinaloa,
thus representing a considerable extension of the known range
southward.
These specimens have, respectively: 14, 12, 14 rows of dorsal
tubercles; 5, 6, 6 tubercles at base of tail; 20, 19, 19 tubercles between
axilla and groin; 32, 32, 33 paravertebral tubercles; 13, 13, 13
lamellae beneath fourth toe; 23, 25, 20 interorbital scales; 26, 28, 28
scales across snout between third labials; 7, 7, 7 scales bordering
postmentals; 8, 7, 7 scales bordering intemasals; 64, 62, 61 scales
from posterior gular region to anus; and 14, 15, 14 scales between
nostril and eye.
These data confirm a decrease from north to south in number of
lamellae beneath fourth toe and of scales bordering postmentals,
and an increase from north to south in number of scales across
snout at third labials and of scales between nostril and eye—as
demonstrated by Dixon (1964:39) for specimens in central and
northern Sonora. However, our specimens have more scales bordering
the intemasals, and fewer interorbital scales, than expected
from north-south trends in these characters as reported by Dixon.
Phyllodactylus tuberculosus is known from northern Sinaloa,
near Los Mochis (KU 67538-40). Although the ranges of P. komolepidurus
and P. tuberculosus apparently overlap, these species may
be ecologically separated in this area.
Distribution in Sinaloa.—Northern coastal lowlands. See Fig. 39.
Specimens examined.—Topolobampo (CSCLB 1518-1520).
Phyllodactylus tuberculosus saxatilis Dixon
Phyllodactylus tuberculosus saxatilis Dixon, Sci. Bull., Research Center, New
Mexico State Univ., 64{1):31, March 1964 (type locality, eight miles
northeast of Villa Union, 200 ft., Sinaloa).
Remarks.—Fifty-four specimens of Phyllodactylus are referred to
P. tuberculosus saxatilis following Dixon (1964:31-36). Dixon recorded
three species of Phyllodactylus in northwestern Mexico: P
homolepidurus homolepidurus in central Sonora; P. tuberculosus
saxatilis in southern Sonora, Sinaloa, central Nayarit, and northern
Jalisco; and P. lanei rupinus in southern Nayarit and northern
Jalisco. Difficulty was experienced in allocating specimens from
Sinaloa to one of the above species because of the extensive overlap
in the ranges of variation of certain meristic characters. With respect