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

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96 UNIVERSITY OF KANSAS POBLS., MUS. NAT. HIST. (UAZ 13412-13); 11.1 mi. N (by hwy. 15) Mazatlan (UAZ 13332); 15.9 mi. N Mazatlan (LACM 6341); 16 mi. N Mazatlan (CSCLB 1655); 17.5 mi. N Mazatlan (LACM 6371); 27.9 mi. N Mazadan (LACM 6372); 8 mi. S PalmMas (LACM 25613); Rosario, 150 m. ("KU 73911-12; CSCLB 1651); 8 km. SSE Rosario ("KU 37625); 4 mi. N San Bias, 400 ft. (JRM llll); Sanlgnacio (LACM 6362); 5 km. SW San Ignaeio, 200 m. ('KU 78465); 1.5 km. ENE San Lorenzo ("KU 47917-24); Teacapan ("KU 73915; LACM 6526-36); Villa Union (" KU 78471; LACM 6350-51); 8 km. N Villa Union. 140 m. ("KU 80689-90); 5.7 km. NE Villa Union ("KU 75434-37); 9.4 mi. NE Villa Union (LACM 6352); 25 mi. NE Villa Union (CSCLB 1656); 12.8 mi. SE Villa Union (LACM 6360); 13 mi. SE Villa Union (LACM 6359); 16.3 mi. SE Villa Union (LACM 6354-58); 18 mi. SE Villa Union (LACM 6353). Literature records.—Costa Rica (Smith and Van Colder, 1955:145); El Dorado (Fngler and DUon, 1961:7); N Mazatlan; Plomosas (Kellogg, 1932; 162); 2 mi. N Presidio (Taylor, 1938:515). Additional records.—2,6 mi. S Rio Canas (CAS 99631); 15.5 mi. E ConcOTdia (CAS 99611); 16.5 mi. E Concordia (CAS 99608); Costa Rica (UIMNH 34887-89); N Culiacan (UF 12858); Rio Culiacan (AMNH 64205); 25 mi. S Culiacan (AMNH 60440); El Dorado (AMHN 70828-29); 1 mi. NEElFuerte (FMNH 71468); 5.0 mi. N Escuinapa (CAS 99601); 13 mi. NNE los Modus (UIMNH 40536-37); Mazatlan (MCZ 44308-09); 3 mi. N Mazatlan (MCZ 32564); ca. 4 mi. N Mazatlan (AMNH 12562); 36 mi. N Mazatlan (UIMNH 38364); 4 mi. NE Mazatlan (SM 10237); 2.3 mi. N, 1.5 mi. W Mazatlan (FAS 7725-33); 3.5 mi. NNW Mazatlan (UMMZ 115197); Rosario (UIMNH 62706); 3 mi. E Rosario (UIMNH 7360-76); 6 mi. NNW Teacapan (KU 91410); 5.7 mi. W Villa Union (AMNH 59284). Family Microhylidae Gastrophryne olivacea mazatlanensis (Taylor) Microhyh mazatlanensis Taylor, Univ. Kansas Sci. Bull., 29:355, October 15, 1943 (type locality, two miles east of Mazatlan, Sinaloa). Microhyh carolinensis mazatlanensis: Hecht and Matalas, Amer. Mus., No vita tes, 1315:5, April 1, 1946. Microhyla olivacea mazatlanensis: Langebartel and Smith, Herpetologica, 10:126, May 5,1954. Gastrophryne olivacea mazatlanensis: Fugler and Dixon, Michigan St. Univ., Mus. Publ., 2( 1) :8, July 20, 1961. Remarks.—Hecht and Matalas (1946:4) reported intergradation between Microhyla carolinensis and M. mazatlanensis in Sonora, Mexico, and as a result considered mazatlanensis to be a subspecies of carolinensis. Twenty-two Gastrophryne olivacea from Sinaloa agree with the original description for Microhyla mazatlanensis Taylor (1943:355-357) with the following exceptions; the lateral black line is absent or is reduced to a single spot on the shoulder in some; the sides are dark brown below the lateral black line, becoming paler ventrally; the inguinal spot and the limb bars, which form a continuous line when the leg is folded, have faint pale centers in individuals from northern Sinaloa; the scattered black dorsal spots tend to form a pattern of lines diverging posteriorly in specimens
AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 97 from southern Sinaloa and are scattered, forming an indistinct pattern, in frogs from northern Sinaloa; the flanks are pale ventrally with a slight peppering of pigment or are faintly mottled with pale brown. The specimens from Sinaloa were compared with 20 specimens from Sonora (20 to 50 kilometers east of Kino), and with 161 frogs from Texas. The Sonoran specimens have brownish flanks; an indistinct row of black spots borders the flanks dorsally and posterior to the eye in some individuals, but spots are absent in others. The brown inguinal spots seem slightly smaller, but darker and more conspicuous, than those of the Sinaloan frogs. The limb bars are either solid, composed of many fused dark brown spots, or reduced to two to four dark brown spots. Dorsal brown spots are present anteriorly, or they are absent. The belly is creamy white with the edges, the chest, and lower jaw mottled with brown, or with a faint peppering of dark pigment. The flanks are distinctly mottled with brown. The Texan frogs have small inguinal spots or lack them entirely. The limb spots, if present, are small, brown to brownish black, separated or fused, and enclose a pale tan area. The dark brown lateral area that is present in frogs from Sinaloa may be absent or indistinct. The dorsal spots are smaller and fewer than in Sonoran frogs, or are absent. The belly is clear with only a trace of mottling laterally. The flanks are unmarked or only faintly mottled. From the characters of the pattern and coloration examined, it is evident that the population in western Sonora differs from the populations in Sinaloa and Texas in having distinctly mottled sides, mottling on the lower jaw, chest, and edges of the belly, and distinct dark brown inguinal and leg spots. Other characters are intermediate between the Sinaloan and Texan populations. Wake (1961:88-89), on the basis of specimens secured in southern Arizona, elevated mazatlanensis to specific status on the assumption that the single specimen reported by Hecht and Matalas (1946:4) is a hybrid and does not represent an intergrading population. If the specimen reported by Hecht and Matalas (1946:4) is a hybrid, then the Sinaloan population would be G. mazatlanensis. Until more material from eastern Sonora and western Chihuahua is available, we refer the Sinaloan specimens to Gastrophryne olivacea mazatlanensis. Regardless of the specific status of the frogs west of the continental divide, those from northwestern coastal Sonora possibly represent a taxon distinct from that in Sinaloa.
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