196 BULLETIN 18 7, UNITED STATES NATIONAL MUSEUM 



Type locality. — Tortuga Island, Gulf of California. 

 Range. — The same. 



CROTALUS TRANSVERSUS Taylor 



Crotalus transversus Taylor, Univ. Kansas Sci. Bull., vol. 30, 1944, pp. 47-52, 

 fig. 1, pi. 6. 



Type.—E. H. Taylor-H. INI. Smith Coll. No. 30001. 

 Type locality. — Near Tres Cumbres (Tres Marias), Morelos, 55 km. 

 southwest of Mexico City. 



Ra/age. — Known only from the vicinity of the type locality. 



CROTALUS TRISERIATUS TRISERIATUS (Wagler) « 



Uropsophus triseriatiis Wagler, Natiirliches System der Amphibien, 1830, p. 176. 

 Crotalus triseriatns triseriatus Klauber, in Githens and George, Bull. Antiv. 



Inst. Amer., vol. 5, 1931, p. 33 (part). — Gloyd, Spec. Publ. Chicago Acad. 



Sci., No. 4, 1040, pp. 84-91, map 6, pi. 6. 



Type. — Berlin Mus. 



Type locality. — Mexico. 



Range. — "The south-central portion of the Mexican Plateau from 

 Nayarit and southern San Luis Potosi through the states of Jalisco, 

 northern Michoacan, Guanajuato, and Hidalgo" (recorded from the 

 states of Guanajuato, Hidalgo, Jalisco, Michoacan, extreme western 

 Morelos, Nayarit, and San Luis Potosi). 



CROTALUS TRISERIATUS ANAHUACUS Gloyd 



Crotalus triseriatus anahuacus Gloyd, Spec. Publ. Chicago Acad. Sci., No. 4, 1940, 

 pp. 91-95, map 6, pi. 7. 



Type.— Mus. Comp. Zool. No. 33681. 

 Type locality. — Valley of Mexico. 



Range. — "The southeastern part of the Mexican Plateau in the states 

 of Mexico, the Federal District, Morelos, Puebla, and Veracruz." 



8 We believe it very dubious that pricei and miquihuanus actually intergrade with 

 triseriatus and anahuacus ; uniformity of character and laclv of concrete evidence of inter- 

 gradation or overlapping character suggest that two species, pricei and triseriatus, actually 

 are involved, each with two races (p. pricei and p. miquihuanus; t. triseriatus and 

 t. anahuacus), as far as now known. It may be noted that Gloyd (op. cit.) knew of the 

 existence of no actual intergrades. Nevertheless, we hesitate to substitute one guess for 

 another without more evidence in its favor than we can now present. 



The situation with respect to gloydi and omiltcmanus is different. Recently acquired 

 specimens demonstrate conclusively that these two forms belong to a group quite distinct 

 from the described plateau forms ; there is, moreover, a geographic overlap between the 

 two groups that supports their specific segregation. Not only is the southern group 

 specifically distinct from the northern, but in view of the ample differentiation of gloydi 

 and omiltemanus we consider it inadvisable to consider one a subspecies of the other. Thus 

 the forms now described may be segregated into a northern group of four races belonging 

 to, probably, two species, and a southern group of two clearly distinct species. The 

 geographic overlap of the groups is demonstrated by a species described by Taylor (trans- 

 versus). Specimens gradually accumulating indicate that still other species and subspecies 

 related to triseriatus remain to be defined in Mexico, but any sort of satisfactory and semi- 

 permanent arrangement will require much more material than we now have. 



