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218 UNIVERSITY OF KANSAS PUBLS., MUS. NAT. HIST, Specimens examined.—5 km. SE Palmito, Durango (in Sinaloa), 1880 m. (' KU 79232); 19.2 km. NE Santa Lucia, 1940 m. (• KU 78973). Literature record.—7 and 9 mi. {byroad) NE El Batel (Zweifel, 1954:149). Crotalus molossus molossus Baird and Girard Crotalus molossus Baird and Girard, Catalogue of North American reptiles, p. 10, 1853 (type locality, Fort Webster, Santa Rita del Cobre, New Mexico). Crotalus molossus molossus: Gloyd, Occ. Pap. Mus. Zool. Univ. Michigan, 325:2, January 28,1936. Remarks.—Klauber (1952:87) reported that specimens of Crotalus basiliscus and C. molossus from southern Sonora show intergradation in several characters, and that no actual overlap in the ranges of the two species had been demonstrated. A female, collected near El Fuerte, has 181 ventrals, 20 subcaudals, 25-25-22 dorsal scale rows, 17-16 supralabials, 16-16 infralabials, 32 dorsal body blotches, and six tail rings. The dorsal blotches are open laterally (see Klauber, 1936:259, fig. 78), and the tail is nearly solid black. The tail length is 5.3 per cent of the total length. Our specimen shares certain characters with C, basiliscus, but because of the low number of ventrals and subcaudals, the distinctive dorsal pattern, the nearly solid black tail, and a knowledge of C. basiliscus from the same general area we assign the specimen to C. molossus. Specimens of C. basiliscus have been taken within about 50 kilometers southwest (near sea-level) and about 50 kilometers northeast (about 520 meters elevation) of the locality of this specimen of molossus {elevation about 150 meters). It is probable that the two species are sympatric in northern Sinaloa. We leave the final clarification of the relationships between C. basiliscus and C. molossus to future workers. Distribution in Sinaloa.—Known only from the northern foothills. See Fig. 89. Specimen examined.—6 km. NE El Fuerte, 150 m. ( 8 KU 78964). Crotalus stejnegeri Dunn Crotalus stejnegeri Dunn, Proc. Biol. Soc. Washington, 32:214, 1919 (type locality, Plomosas, Sinaloa), Remarks.—One male of this rare species has 175 ventrals, 42 subcaudals, 28-27-22 dorsal scale rows, 14-14 supralabials, 14-16 infralabials, 2-2 preoculars, 4-3 postoculars, 3-3 suboculars, 38 dorsal body blotches, about 12 tail bands (indistinct on posterior part of tail); the tail length is 13.9 per cent of body length. The color pattern
AMPHIBIANS AND REPTILES OF SINALOA, MEXICO 217 and scale characteristics agree with the description by Klauber (1952:107-09). Distribution in Sinaloa.—Southern highlands in tropical deciduous forest See Fig. 88. Specimen examined.—2.2 km. NE Santa Luck, 1155 m. (*KU 78972). Literature records.—Plomosas (Gloyd, 1940:232; Smith, 1943a:414). Order CBOCODILIA Family CROCODYLIDAE Crocodylus acutus Cuvier Crocodilus acutus Cuvier, Ann, Mus., 10:55, pis. I, II, 1807 {based on a specimen from Santo Domingo, West Indies). Remarks.—The crocodile occurs in the lowland drainages, coastal lagoons, and estuaries of southern Sinaloa. Residents of Culiacan have reported "caimanes" from near Altata, but verification of these accounts must await the securing of specimens. Recently hatched young were reported from near Teacapan on August 10 (Scott, 1962:84). A large specimen from near Teacapan measured 3 meters. Distribution in Sinaloa.—Known only from extreme south. See Fig. 91. Specimens examined.—Palmillas (LACM 6558, 6560); 4 mi. SE Teacapan (LACM 6559). Literature records.—Mazatlan (Boulenger, 1889:281; Cope, 1900:175; Zweifd, 1959a:3); Presidio (Boulenger, 1889:281). Additional records.—Mazatlan (AMNH 15162-63; USNM 72342). SPECIES OF QUESTIONABLE OCCURRENCE Records of several species that have been reported from Sinaloa are doubtful for various reasons. Five such species are discussed below. Rana montezumae Baird Rana montezumae Baird, Proc. Acad. Nat. Sci. Philadelphia, 7:61, 1854 (type locality, City of Mexico, Distrito Federal), There is a single specimen in the collections of the Museum of Comparative Zoology (MCZ 8629) recorded from Mazadan. Dunn (1922:222) reported this specimen as Rana pustuhsa. Oliver (1937:7-8) re-examined the frog and assigned it to Rana montezumae. We have examined the specimen and agree with Oliver that the frog definitely is not R. pustuhsa. The presence of paired lateral vocal sacs and dorsolateral glandular folds indicate the specimen is a member of the pipiens group. Certain characteristics suggest the frog might represent Rana megapoda, but because of its poor condition we follow Oliver and refer the specimen to Rana montezumae. Because both Rana montezumae and Rana megapoda are restricted to the Mexican plateau and because Mazatlan represents a habitat distinct from those known for the species, we do not include Rana montezumae in the fauna of the state.
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