. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. 126 Adianccs in Herpetologij and Ecohitionary Biology. Figure 2. Approximate distribution of Polychrus marmoratus (•) and P. acutirostris (O). Iquitos area and especially in the state of Sao Paulo. An important qualification refers to the southern limit of acutirostris. Koslowsky (1898) cites the species for Argentina (Gran Chaco, Misiones, Corrientes); he obviously saw specimens, but the refer- ences are vague. The only actual Argen- tinian s
. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. 126 Adianccs in Herpetologij and Ecohitionary Biology. Figure 2. Approximate distribution of Polychrus marmoratus (•) and P. acutirostris (O). Iquitos area and especially in the state of Sao Paulo. An important qualification refers to the southern limit of acutirostris. Koslowsky (1898) cites the species for Argentina (Gran Chaco, Misiones, Corrientes); he obviously saw specimens, but the refer- ences are vague. The only actual Argen- tinian specimens mentioned in the litera- ture seem to be those from the Para- guayan border collected by the Deutsche Gran-Chaco-Expedition (Hellmich, 1960) and one from Misiones (no further data) cited by Burt and Burt (1931). The oc- currence of the species in Uruguay is likewise in doubt, no specimens being mentioned by Vaz-Ferreira and Sierra de Soriano (1960) and Lema and Fabian- Beurmann (1977). Finally, I know of no specimens from the three southernmost states of Brasil, Parana, Santa Catarina, and Rio Grande do Sul. Description. Inspection of the map shows one first important feature: the two species are parapatric. In fact, there are no intergrading specimens and no cases of sympatry. The complementarity be- tween open and closed formations is practically perfect. The apparent mixture of localities in northeastern Brasil is due to the clearing of the Atlantic forest for agriculture. P. acutirostris very quickly occupies such spaces; this can also be very clearly seen in the state of Sao Paulo. A second feature is that the distribution. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Williams, Ernest E. (Ernest Edward); Rhodin, Anders G. J; Miyata, Kenneth; Harvard University. Museum of Comparative Zoolog
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