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190 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST. midbody are 19 in nine specimens and 20 in one; 19-22 at the neck, and 16, 17 or 19 at the vent. The supralabials are 6-6 in three, 6-5 in one, 6-7 in one, and 7-7 in three (excluding KU 73602, 73604); infralabials are 7-7 in one, 8-8 in two, 8-9 in one, 9-7 in one, 9-9 in one and 10-9 in one (excluding KU 73601-02, 73604). The preoculars are either two or three, postoculars two or three (four in KU 73603), and suboculars 2 to 4. The temporals are numerous (6-12) and highly variable. Dark pigment in the lateral interspaces is absent, or present as indistinct clumps; all dorsal blotches, except the anterior first or second, have dark edges. The interorbital band barely touches the parietals in a snake from northern Sinaloa (KU 73601); a specimen from near Guamuchil (KU 73607) has a distinct extention of the band to include part of the parietals. Six specimens from south of Guannichil to about 24 kilometers north of Mazatlan have above one half or more of the parietals included in the interorbital band. One specimen (KU 73602) from 10 kilometers north of Mazatlan has the band barely including the parietals. A specimen from near Piaxtla has a second black band that crosses the parietals posterior to the interorbital band; the interorbital band and parietal band are connected laterally. The ventral counts of the males, arranged in sequence from south to north, are 160, 163, 164, 158, 148, 156, 155, and 151. The numbers of body blotches for both sexes from south to north are 10, 13, 14, 12, 12, 14, 18, 15, 11, and 11. Four specimens, from localities in northern and southern Sinaloa, have dorsal bands that are more than twice the length of the interspaces and in five specimens the dorsal bands are distinctly less than twice the width of the interspaces. None of the characteristics used by Shannon and Humphrey to distinguish P. b. klauberi (1959a: 145) from P. b. fortitus is consistant in the Sinaloan specimens at hand. The variation in the number of ventrals, extent of the interorbital band, frontal width/frontal length, and the number of body blotches appear to be clinal for P. browni from Sinaloa and therefore casts doubt on the validity of P. b. klauberi. We use the binomial rather than attempting to allocate specimens from Sinaloa to either of the subspecies fortitus or klauberi. Phyllorhynchus browni is presently being studied by H. W. Campbell and the second author. Nearly all specimens were collected at night on the road. Distribution in Sinaloa.—Vhyllorhynchus browni has been re-
AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 191 corded from many localities throughout the Sinaloan lowlands. See Fig. 78. Specimens examined.—15.4 mi. N Culiacan (CSCLB 1975); 40.2 mi. N Culiacan (LACM 7317); 40.8 mi. N Culiacan (LACM 7318); 44.9 mi. N Culiacan (LACM 7319); 37.2 mi. S Elota, Rio (LACM 7310); 24 km. S Guamuchil (°KU 73607): 37 km. S Guanrachil ( B KU 73608); 7 mi. S La Cruz turaoff (LACM 7320); 13.3 mi. N Los Mochis (CSCLB 1422); 51 km. N Los Mochis (*KU 73601); 10 km. N Mazatlan (* KU 73602); 12.3 mi. N Mazatlan (LACM 7322); 13.8 mi. N Mazatlan (LACM 7314); 14.2 mi. N Mazatlan (LACM 7316); 15.7 mi. N Mazatlan (LACM 7308); 16 mi. N Mazatlan (UCLA 14499); 17.3 mi. N Mazatlan (UCLA 14500); 17.6 mi. N Mazatlan (LACM 7315); 34 km. N Mazatlan ("KU 73604); 21.9 mi, N Mazatlan (LACM 7311); 22.4 mi. N Mazatlan (CSCLB 1426); 22.9 mi. N Mazatlan (LACM 7312); 40 km, N Mazatlan ("KU 73603); 51 km. N Mazatlan ('KU 86608); 42.5 mi. N Mazatlan (LACM 7309); 53.2 mi. N Mazatlan (CSCLB 1425); 85 km. NNW Mazatlan ( s KU 73605); 93 km. NNW Mazatlan (*KU 73606); 1.3 mi. N Piaxtla, Rio (CSCLB 1424); 4.3 mi. N Piaxtla, Rio (CSCLB 1423); 1 km. E Piaxtla (*KU 37597); 3 mi. S San Ignacio turnoff (LACM 7313); 1.7 mi. N Terreros (LACM 7321); 2.6 mi. N Terreros (LACM 7325); 10.9 mi. N Terreros (LACM 7323); 11.3 mi. N Terreros (LACM 7324). Literature records.—45.7 mi, S Culiacan; 55-60 mi. N Mazatlan (Shannon and Humphrey, 1959a:145). Additional records.—El Dorado (AMNH 90792); 4.8 mi, S Elota, Rio (SU 24016); 55.6 mi. N Mazatlan (FAS 14707); 12.3 mi. S Mocorito, Rio (SU 24015). Phyllorhynchus decurtatus Cope Phyllorhynchus decurtatus Cope, Proc. Acad. Nat. Sci. Philadelphia, 20:310, 1869 (type locality, "the upper part of Lower California"), Remarks. — One female from southern Sinaloa has 35 body blotches that are wider than the interspaces, 171 ventrals, and 20 subcaudals. This specimen appears to be closely related to P. d. norrisi; however, because of the hiatus between the range of norrisi and this specimen, and the large amount of variation in snakes of this species (Smith and Langebartel, 1951:183), a subspecific designation is withheld pending the discovery of more specimens from western Mexico. Distribution in Sinaloa.—Known only from the southern lowland tropical semiarid forest near Mazatlan. See Fig 78. Specimen examined.—i2 km. N Mazatlan (' KU 73609). Pituophis melanoleucus affinis Hallowell Pityophis affinis Hallowell, Proc, Acad. Nat Sci. Philadelphia, 6:181, 1852 type locality, Zuni, McKinley county, New Mexico), Pituophis melanohucas affinis; Smith and Kennedy, Herpetologica, 7:96, September 13,1951. Remarks.—Seven specimens (two females and five males) of Pituophis melanoleucus affinis have 217-230 (226.3) ventrals; 52-58
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PLATE 1 Fie. 1. Tropical Thorn Wood
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PLATE 8 Fit:. 1. Subtropical Dry Fo
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