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94 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST. When a cluster was disturbed, the larvae would disperse, some swimming away and others sinking to the bottom. Jelly envelopes, some containing undeveloped eggs, were scattered over the bottom of the pond. The tadpoles clustered at the surface may have been feeding on surface scum. Three large series were collected and allowed to develop. Three days later the larvae lost their external gills. Distribution in Sinaloa.—Throughout the lowlands, below 250 meters. See Fig. 28. Specimens examined.—8.9 mi. N Acaponeta [Nayarit] (LACM 6408); 2.1 mi. NE Concordia (CSCLB 1608); 4 km. NE Concordia ("KU 73901); 3.7 mi. NE Concordia (CSCLB 1611-16); 4,7 mi. NE Concordia (CSCLB 1617-22); Culiacan (CSCLB 1601-05); 19.7 mi. S Culiacan (LACM 6405); 19.8 mi. S Culiacan (LACM 6406); 20.2 mi, S Culiacan (LACM 6404); 12 mi. NE El Fuerte (CSCLB 1606}; 2.9 mi. N Elota (CSCLB 1623); 12 mi. N (by hwy. 15) Rio Elota (LACM 6400); 15.5 mi. N (by hwy. 15) Rio Elota (LACM 6401-02); 3.4 km. SE Escuinapa («KU 73902-08); 1-3 mi. E La Cruz (LACM 6394-95); 5 mi. E La Cruz LACM 6397-99 ; 1Q mi. E La Cruz (LACM 6396); Matatin, 170 m. (* KU 73897-900); Mazatlan (CSCLB 1607; SDSC 1758-65); 5 mi. N Mazatlan (CSCLB 1625-38); 7.1 mi. N Mazatlan (CSCLB 1639-41): 8 mi. N Mazatlan (CSCLB 1610); 15.9 mi. N Mazatlan (CSCLB 1609); 55 mi. N Mazatlan, Rio Piaxtla (CSCLB 1642); 7.3 km. SW Matatan, 155 m. (• KU 78455-56); Rosario, 150 m. (* KU 73896); 4 mi. N San Bias, 400 ft. (JRM 1105-07); San Ignacio (LACM 6391-93); 5 km. SW San Ignacio, 200 m. (*KU 78457); 1.5 km. ENE San Lorenzo ("KU 47904-05); Teacapan (LACM 6516-22); 0.8 mi. S Terreros (LACM 6409); Villa Um6n ("KU 75383-96; LACM 6373-75); 3 mi. NE Villa Union (LACM 6390); 9.5 km. NE Villa Union (*KU 75397); 7.4 mi. NE Villa Union (LACM 6376-82); 9.4 mi. NE Villa Union (LACM 6383); 3.7 km. E Villa Union, 60 m.
AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 95 (62.5) and tibia lengths of 25.8-33.0 (29.8). The corresponding measurements for eight females are 45-78 (58.0) and 23.8-37.0 (29.2). One juvenile has a snout-vent length of 34 and a tibia length of 16.6, See Duellman and Trueb (1966:293) for additional notes on the Sinaloan population of this species. Smilisca baudinii is one of the first frogs to begin breeding at the onset of the rainy season. Large choruses were heard as early as June 29 near Concordia. Males call from the shore or from low bushes around temporary ponds. Gravid females were collected at breeding ponds as early as July 7. Amplexing pairs were seen in the water and perched on limbs a few feet above the water. On July 1, observations were made (at a breeding pond located about 10 miles NE of Villa Uni6n) which emphasized the spatial isolation existing between calling males of different species breeding at the same pond. The pond was about ten meters in diameter and was nearly circular. The shore was grassy except for a large tree at one side and some shrubs in another place. Small scattered bushes grew about 6 meters from the water's edge. Individual males of four species were calling from specific sites around the pond. Bufo mazatlanensis called from the open grassy shore near the water. About 30 males of Phyllomedusa dacnicolor were calling from limbs and leaves high in the tree above the water. Several jumped eight to ten meters into the pond when disturbed. Another frog, Pternohyla fodiens, was calling well away from the water, usually from the ground at the base of a bush or from a depression. Several Smilisca were calling from shore near the shrubs or from the lower branches of the shrubs. At no place around the pond were any two species calling from the same site, thus enhancing the separation of contemporary breeding populations. Distribution in Sinaloa.—Throughout the state below 800 meters, most commonly in the southern lowlands. See Fig. 29. Specimens examined.—8 km. N Carrizalejo, 460 m. (* KU 78133}; 4 km. NE Concordia ('KU 73914); 3.7 mi. NE Concordia (CSCLB 1657-63); 4.5 mi. NE Concordia (LACM 6345-49); 5 km. SW Concordia (• KU 75438-39); 6 km. E Cosala, 460 m. ("KU 73910); 3.5 mi. E Coyotitan (LACM 6361); N Culiacan (CSCLB 1664-66); 51 km. SSE Culiacan (* KU 37792); El Dorado (°KU 60392); 15.5 mi. N Rio Elota (LACM 6366); 9.4 mi. SE Escuinapa (LACM 6367-70); Isla Pamiito del Verde, middle (*KU 73916-17); 5 mi. E La Cruz (LACM 6363-65); 11.1 mi. NW (by hwy. 15) Los Moehis turnoff [on hwy. 15] (UAZ 13331); Matatan, 170 m. (*KU 73913); 7.3 km. SW Matatan, 155 m. (• KU 78464, 78466-70); Mazadan (CAS 89707; SDSC 1756-57, 1771-72); 1.9-5.7 mi. N Mazatlan (UAZ 13338, 13414-15); 4.3 mi. N Mazadan (LACM 6342-44); 5 mi. N Mazatlan (CSCLB 1649); 5.5 mi. N Mazatlan (LACM 6340); 7.1 mi. N Mazatlan (CSCLB 1652-54); 8.8 mi. N (by hwy. 15) Mazatlan (UAZ 13411); ca. 11 mi. N (by hwy. 15) Mazadan
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