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152 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST. Specimens from western Mexico demonstrate wide overlap in characters of horridum and exasperatum. The supranasal contacts the postrostral in two of nine specimen of horridum; four of eight specimens of horridum have eight or more scales between superciliaries; the second supralabial contacts the nasal or prenasal in six of nine specimens of horridum. Although we have not seen an animal with a color pattern obviously intermediate between the two races in Sinaloa, Bogert and Martin del Campo (1956:65) suggested clinal variation in this character as well. A detailed study of Heloderma in northern Sinaloa probably will indicate that exasperatum is representative of the northern terminus of Heloderma. horridum and that clinal variation accounts for the distmctiveness of this population, as visualized by Bogert and Martin del Campo (1956:28). However, we continue to recognize two races in Sinaloa until additional material from the foothills between the Rio Culiacan and the Rio Fuerte becomes available. Distribution m Sinaloa.—Known only from the area drained by the Rio Fuerte. See Fig. 57. Specimen examined.—13 km. NNE Vaca, 400 m. (* KU 80743). Literature record.—San Bias, 100 m. {Bogert and Martin del Campo, 1956:32). Heloderma horridum horridum (Wiegmann) Trachyderma horridum Wiegmann, Isis von Olcen, 22:421, 1829 (type locality, "Mexico"; type locality restricted to Cuemavaca, Morelos by Bogert and Martin del Campo, Bull. Amer, Mus. Nat Hist., 109:21, April 16, 1956). Heloderma horridum Wiegmann, Isis von Oken, 22:628, 1829. Heloderma horridum horridum: Bogert and Martin del Campo, Bull. Amer. Mus. Nat Hist., 109:20, April 16,1956. Remarks.—Three specimens of Heloderma h. horridum (KU 73770, 78905-06) have the following characteristics, respectively: snout-vent lengths 246, 310, 268; tail lengths 192, 227, 189; tail/ snout-vent length ratios 0.78, 0.73, 0.72; ventrals from gular fold to anus 62, 64, 62; subcaudals 84, 78, 78; scales across head between posterior superciliaries 9, 7, 7; pairs of infralabials reaching chin shields 2, 1, 1; supranasal contacts postnasal no, yes, no; preanal scales not enlarged. Two specimens are essentially similar in pattern, having a brown ground color with yellow scales appearing just anterior to midbody; the yellow scales become more numerous from anterior to posterior, and there are five pairs of yellow bands on the tail. The yellow spots begin on the nape of the other lizard (KU 78906).
AMPHIBIANS AND REPTILES OF SINALOA, M&aoo 153 Most specimens were collected on the road in late evening or at night. A few individuals were active in the morning, suggesting a crepuscular activity period. Distribution in Sinaloa.—Probably occurs throughout the state south of the Rio Mocorito. See Fig. 57. Specimens examined.—-7'.3 mi. S Elota, Rio (LACM 6596); 41 mi. S Elota (JMS osteo. coll.); 25.2 mi. S Escuinapa (CSCLB 2106); Matatan, 170 m. (*KU 73770); 17.8 mi. N Mazatlan (CSCLB 2105); 24.9 mi. N Mazatlan (UAZ 7176); 26.8 mi. N Mazatlan (LACM 6594); 82 mi. N Mazatlan (CSCLB 2109); Palmillas (LACM 6597); San Ignaeio (LACM 6595); 5 km. (by road) SW San Ignaeio, 200 m, (" KU 78905-06); Terreros (JMS osteo. coll,). Literature records,—Escuinapa, 100 m. (Bogert and Martin del Campo, 1956:27); Piaxtla, 75 m. [80 km. N Mazatlan] Bogert and Martin del Campo, 1956;27; Smith and Van Gelder, 1955:145); Palmillas (Scott, 1962:28); Presidio; 12 mi. NW Rosario, 100 m. (Bogert and Martin del Campo, 1956:27; Boulenger, 1885b:302). Additional records.—Between Acaponeta. [Nayarit] and Escuinapa (MVZ 66199); 2 mi. ENE Copala, 1400 ft. (TCWC 12430); Costa Rica (UIMNH 34932); Cruceio de Piaxtla (UF 12836); 41.3 mi. N Culican (MVZ 70256); 90 mi. N Culiacan (FAS 9077); 40 mi. S. Culiacan (MVZ 71318); 7 mi, SE Escuinapa (MVZ 68970); 28.4 mi. S E spinal (FAS 17002); 63 mi. N Mazatlan (FAS 16909); 15 mi. S Mazatlan (MVZ 66200); 1.3 mi. W, 2.5 mi. N Mazatlan (FAS 9054). Heloderma suspectum suspectum Cope Heloderma suspectum Cope, Proc, Acad. Nat. Sci. Philadelphia, 21:5, 1869 (type locality, Sierra de Moreno on the boundary between the United States and Mexico). Heloderma suspectum suspectum: Bogert and Martin del Campo, Bull, Amer. Mus. Nat Hist., 109:35, April 16, 1956. Remarks.—One specimen from El Dorado (Bogert, personal communication) is the first record for Sinaloa and the southernmost record for the species. There is an apparent overlap of about 310 kilometers in the range of the two species of Heloderma in northern Sinaloa. Distribution in Sinaloa.—Known only from the central coastal lowlands. See Fig. 57. Specimens examined.—None. Additional record.—El Dorado (AMNH 90786). Suborder SERFENTES Family Typhlopidae Typhlops braminus (Daudin) Etyx braminus Daudin, Hist. Nat. . . .des reptiles, 7:279-280, 1803 (type locality, Vizagapatam, India). Typhlops braminus: Cuvier, Eegne Animal, Ed. 2, 2:73, 1829. Remarks.—Four specimens agree with the description given by
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