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148 UNIVERSITY OF KANSAS PUBLS., MUS. NAT, HIST. white chin, three have a white chin with a few hlack scales and one has a black spotted chin like mazatlanensis. Another specimen (KU 78808) from 19.2 kilometers northeast of Santa Lucia, between the population represented by the above five lizards and a population of huico represented by one specimen (KU 75607) from Santa Lucia, shows no noticeable trend toward huico. Another series of nine lizards (KU 73761; LACM 6697-704) from La Cruz on the Rio Elota is intermediate between nigrigularis and mazatlanensis. These lizards are common in the coconut palm groves along the beach north of Mazatlan. Near San Ignacio, individuals were observed along the dry river bed, in denser vegetation along the river, and in arroyos surrounded by dense forest. No specimens were seen in heavily shaded portions of the forest. Nearly all adult females collected in July were gravid. Distribution in Sinaloa.—From near Mazatlan northward to near La Cruz in the lowlands and near El Palmito (Durango) in the highlands. See Fig. 55. Specimens examined.—1,5 km. SE Camino Real, Rio Piaxtla, 120 m. (• KU 63726-29); 8.3 mi. ENE Concordia (UAZ 14230-39); 10 mi. S Elota (UAZ 11275, 11281-82, 11284-86); 5 km. SW El Palmito, 1900 m. (• KU 75608-12); La Cruz, 9 m. (' KU 73761; LACM 6697-704); N Mazatlan (LACM 6715-16; CSCLB 2060-61); 2 mi. N Mazatlan (LACM 6711-14); 7 mi. N Mazatlin (LACM 25856-58); 1.5 km. SE Mazatlan (• KU 29749); 5.4 mi. SE Mazatlan (UAZ 6262, 6271); 8 km. NW Mazatlan ('KU 63409-10); 5 km. NNW Mazatlan (* KU 29736, 29741); 1 mi. W Mexican hwy. 15, Rio Piaxtla (CSCLB 2043); 21.2 mi. S Rio San Lorenzo (UAZ 14220-29); 5 km. SW San Ignacio, 200 m. ("KU 78793-807); San Ignacio (LACM 6722-32); 19.2 km. NE Santa Lucia, 1940 m. ("KU 78808); 54 mi. N Tropic of Cancer [on hwy. 15] (LACM 6717-21). Literature records.—2 mi. N Coyotitan; 9 mi. S Coyoh'tan (Zweifel, 1959a: 93); Isla de Ios Chivos (Martin del Campo, 1941:761); Mazatlan (Burt, 1935:176; Taylor, 1938:522; Van Denburgh, 1898:463; Zweifel, 1959a:93); N Mazatlan; 9 mi. N Mazatlan; 20 mi. N Mazatlan; 11 mi. N, 1.5 mi. E Mazatlan; 1 mi. SE Mazatlan; 2.3 mi. E, 1.5 mi. S Mazatlan; 5.4 mi. SE Mazatlan; 2.8 mi. N, 1.4 mi. W Mazatlan; 2.8 mi. NNW Mazatlan, 25 ft.; Rincon de Urias, E Mazatlan (Zweifel, 1959a:93). Additional records.—Mazatlin (EHT-HMS 581, 588-90, 750-54; AMNH 86830; UIMNH 19954-61, 19963-64). Cnemidophorus costatus nigrigularis Zweifel Cnemidophorus sacki nigriguiarfs Zweifel, Bull. Amer. Mus. Nat. Hist., 117:93, April 17, 1959 (type locality, 10.5 miles northwest of Culiacan, Sinaloa). Cnemidophorus costatus nigrigularis: Duel!man and Zweifel, Bull. Amer. Mus. Nat. Hist., 123:181, February 26, 1962. Remarks.—See Zweifel (1959a:93-96) for a discussion of variation and distribution of this subspecies.
AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 149 Twenty-six specimens have 33-42 (36.6) femoral pores (excluding KU 44683, 44687, 44690); 214-252 (235.0) granules from occiput to rump (excluding KU 44687, 44690, 44694-95); 89-113 (105.1) granules around body at ventral 15 from axilla (GAB) (excluding KU 44683, 44685, 44687, 44690, 44694, 44696); 11-20 (15.8) granules between paravertebral stripes (PV) (excluding KU 44694, 62819, 73764); and snout-vent lengths of 44-105 (65,0) mm. (excluding KU 44694). The PV/GAB ratio is 0.108-0.190 (0.151). Dorsal pattern types I and III (Zweifel, 1959a:66-67) are not represented in the specimens at hand. Twenty-three specimens (snout-vent lengths of 97-103 mm.) have pattern V. The circumorbital scales contact the frontal in two and do not reach the frontal in 24. All of the large individuals examined have black On the chin; the bellies of three specimens are almost totally black, and one male (KU 73764, snout-vent length 103 mm.) is completely black ventrally with the exception of some white spots on the hind legs and tail. Distribution in Sinaloa.—Coastal lowlands approximately between Terreros and Abuya. See Fig. 55. Specimens examined.—^ km. E Cosala, 460 m. (* KU 73765); N. Culiacan (CSCLB 2041-42); 19 km. N Culiacan, 120 m. (' KU 44677-97); 14 mi. N Culiacan (CSCLB 2044); 1.5 km. NW Culiacan (KU 48207, 48508-09); 17,5 km. NW Culiacan ('KU 62819-20); 9 mi. S Guamuchil (LACM 25859); 4 km. SW Navolato, 6 m. (• KU 73763-64); 1.5 km. ENE San Lorenzo (KU 48491-507); Terreros (LACM 6705-06, 6710). Literature records.—23.3 mi. S Caitime; 4 mi. S Culiacan; 10.5 mi. NW, 15.6 mi. NW, 16.5 mi. NW, 20 mi. NW Culiacan; 25-26 mi. NW Elota; 36.8 mi. NW Elota (Zweifel, 1959a:96). Additional records.—Cost* Rica (UIMNH 34934-35): 9.9 mi. N Culiacan (AMNH 86831); 12.1 mi. N Pericos (UIMNH 39242-46). Cnemidophorus tigris Baud and Girard Cnemidophorus tigris Baird and Girard, Proc. Acad. Nat Sci., Philadelphia, 6:69, 1852 (type locality, Valley of the Great Salt Lake, Utah). Remarks.—There are two populations of Cnemidophorus tigris in Sinaloa. One occurs in the northern lowlands and the other inhabits the foothills of the Bio Fuerte drainage. The lowland population is represented by nine specimens from Topolobampo (CSCLB 1507-1515) and two specimens from San Miguel (KU 44724-25). These eleven lizards have the following characteristics: snout-vent length 52-69 (60.7) mm.; granules from occiput to rump, 192-217 (207.2) {except CSCLB 1513); granules around midbody, 79-95 (87.0) (except CSCLB 1510-13); femoral pores (total), 34-41 (36.7); lamellae beneath fourth toe, 29-34 (30,8); and scales be- 10—3685
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PLATE 1 Fie. 1. Tropical Thorn Wood
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