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100 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST. The first specimen of Hypopachus was collected in late June as it called from a hole in the bank of a slow, rain-fed stream. Heavy rain that afternoon initiated the breeding season for several species of frogs which were then collected for the first time. Three gravid females were taken from a pond southeast of Villa Union where several males were found calling from hoof depressions around the edge of the pond. No amplexing pairs were seen that night. Other males were calling from concealed sites in grass near the Rio Elota. The call is a loud Waaaaa, lower in pitch than Gastrophryne, and lasting two or three seconds. Amplexing pairs were noted swimming in the water on two occasions in mid-August. Distribution in Sinaloa.—Known from the coastal lowlands south of Espinal. See Fig. 31. Specimens examined.—2.1 mi. NE Concordia (CSCLB 1709-11); 4 km. NE Concordia ("KU 73935-38); 3.7 mi. NE Concordia (CSCLB 1673-1707); 4.5 mi. NE Conoordia (LACM 6475); 10 km. SW Concordia (»KU 73939); 16 mi. N Coyotitan (LACM 6487); 6 mi. N (by hwy. 15) Rio Elota (LACM 6493-95); 15.5 mi. N (by hwy. 15) Rio Elota (LACM 6496-99); 9.4 mi. SE Escuinapa (LACM 6545-47); 34 km. SE Escuinapa (* KU 73940-43); 1-3 mi. E La Cruz (LACM 6488); 5 mi. E La Cruz (LACM 6489-92); 7.3 km. SW Matatan, 155 m. (* KU 78497-99); 7.1 mi. N Mazatlan (CSCLB 1708); 3 mi. S Rosario (LACM 6503); 9 km. NE Villa Union (KU 75465-68); 16.3 mi. SE Villa Union {LACM 6476-86). Literature records.—8.1 and 8.8 mi. N Mazatlan (Shannon and Humphrey, 1958:88); Presidio (Boulenger, 1883:344; Kellogg, 1932:185). Additional records.—8.0 mi. S Rio Balurate (CAS 99629-30); 9 km. NE Conoordia (KU 95939-44); 1.0 mi. E Concordia (CAS 99621); 1.1 mi, E Concordia (CAS 99619); 12.4 km. SW Concordia (KU 95945). Family Ranidae Rana catesbeiana Shaw Rana catesbeiana Shaw, General Zoology, 3:106, pi. 33, 1802 (based on a specimen from North America; type locality restricted to South Carolina by Kellogg, Bull. U. S. Nat. Mus., 160:197, March 31, 1932). Remarks.—Two recently metamorphosed frogs have snout-vent lengths of 35.7 and 43,4. The tips of the toes are pointed; the subarticular tubercles of the hind feet are small and rounded; dorsolateral folds are absent; the tympanum is distinct and approximately the same size as the eye in both specimens. One of the frogs was taken on August 4, 1962, from a roadside pond in association with Phyllomedusa dacnicolor, Leptodactylus occidentalis, Gastrophryne olivacea mazatlanensis, and Bufo marinus. In 1956, Rana catesbeiana was introduced near Los Mochis in anticipation of its use as a harvestable food item (Ibarra, 1963:19).
AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 101 Since its introduction, the bullfrog has spread throughout the irrigation ponds and ditches of the agricultural region around Los Mochis. Males were heard calling on several nights along the highway south of Los Mochis. The frog is well established and probably will continue to spread whenever and wherever suitable habitat becomes available. Distribution in Sinaloa,—Known only from the vicinity of Los Mochis and Guasave. See Fig. 23. Specimens examined.—Los Mochis (CSCLB 1600); 5 Jam. N Los Mochis (•KU 73944); 6,5 km. E Los Mochis ("KU 62363); 24.3 mi. S (by hwy. 15) Los Mochis (LACM 6416). Additional records.—3.6 mi. E Guasave {CAS 99050); Los Mochis tumoff (on hwy. 15) (FAS 14105-09); 15 mi. N Los Mochis {SM 10625). Rana pipiens Schreber Rana pipiens Schreber, Der Naturforscher, Halle, 18:185, pJ. 4, 1782 (based on a specimen from Raccoon, Gloucester county, New Jersey). Rana fcrreri Boulenger, Ann, Mag. Nat. Hist., ser. 5, 11:343, May, 1883 (type locality, Presidio de Mazatlan, Sinaloa). Remarks.—Rana pipiens has been collected from near sea level in tropical thorn woodland to about 1700 meters in tropical deciduous forest. This species is frequently found near irrigated fields, roadside pools in the lowlands, and creeks, rivers, or ponds at the higher elevations. The leopard frog is another species which has benefitted from agricultural development in Sinaloa, having become abundant in the irrigation ditches near Los Mochis. Distribution in Sinaloa.—Throughout the state, below 1700 meters. See Fig. 32. Specimens examined.—8 km. N Carrizaleio, 460 m. (KU 78158-77); 1 km. S Concepcion, 75 m. (KU 63676); Concordia (UNM 10014-16); 7.2 mi. NE Concordia (CSCLB 1599); 6 km. E Cosala, 460 m. (KU 73949); Coyontan (JFC 62:16-17); 4 mi. N Culiacan (JMS osteo. coll.); 80 mi. N Culiacan (LACM 6420); 21.4 mi. S Culiacan (LACM 6426); ElBurrion (JFC 62:39- 44); 6 km. NE ElFuerte, 150 m. (KU 78154-55); 15.4 mi. N Rio Elota (JMS osteo. coll.); 9 mi. S Escuinapa (LACM 25688); 6 km. ESE Guasave (KU 48981-82); 3.3 mi. S Guasave
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