43 



Aechmophrys Coues, 1875. In Wheeler, Rept. Explor. and Surv. West of lOO"' Mer. 5: 609. 

 Sistrurus Garman, 1883. Mem. Mus. Comp. Zool., 8: 118. 



Haploaspis Cope, 1883 (emendation of Aploaspis Cope, 1867). Proc. Acad. Nat. Sci. Phila.,1883: 13. 

 Type species: Crotalus horridus Linnaeus 1758, Syst. Nat. Ed. 10:214, by subsequent designation, 

 Fitzinger, 1843: 29, according to ICZN Dir. 56: maintained name: Op. 92. 



Crotalus durissus terrificiis (Laurenti, 1768) 

 Caudisona terrifica Laurenti, 1768. Syst. Rept.: 93. 



Crotalus terrificus Boulenger, 1896. Cat. Snakes Brit. Mus. Nat. Hist. 3: 573. 

 Crotalus durissus terrificus Klauber, 1936. Rattlesnakes 1: 32. 



Crotalus terrificus terrificus Serie, 1936. Inst. Mus. Univ. La Plata Obra Cincuentenario: 54. 



Crotalus terrificus crotaminicus Moura Gon^alves, 1957. An. Acad. Bras. Cienc. 28: 365. 



Crotalus durissus terrificus Hoge, 1966. Mem. Inst. Butantan 32: 147. 

 Type locality: Mentioned in original description as ^'Habitat in America infragraduum elev. 45" ". 

 Restricted to Julio de Castillo, Municipio de Taquari, Estado Rio Grande do Sul, Brazil by neotype 

 designation (Hoge, 1966). 



Distribution: Catamarca, Cordoba, Corrientes, Chaco, Entre Rios, Formosa, Jujuy, La Rioja, Mendoza, 

 Misiones, Salta, San Juan, San Luis, Santa Fe, Santiago del Estero and Tucuman. Also in Perii, Bolivia, 

 Paraguay, Uruguay and Brazil from Mato Grosso and Minas Gerais to Rio Grande do Sul. Paranaense, 

 Chaqueiia, Espinal and Monte provinces. 



Commients: As commented for Boa constrictor occidentalism it is preferable to eliminate La Pampa from the 

 distribution (Tiranti & Avila, 1997). 



ACKNOWLEDGMENTS: We thank the curators of all museums visited for permission to examine the 

 specimens in their care. E. Lavilla, M. Halloy and M. Harvey revised the manuscript, and their comments 

 greatly improved it. We also thank A. Alvarez, R. Femandes, S. Kretzschmar, L. Rey, C. LIbeda, and T. 

 Waller for their comments about different topics. Miguel Almazan, and Nora Kotowicz drew the maps. 



