An ecogeographic analysis of the herpetofauna of the Yucatan Peninsula ecogeographicana00leej Year: 1980 20 MISCELLANEOUS PUBLICATION MUSEUM OF NATURAL HISTORY Tunkas (20° 54' N, 88° 45' W), Yuca- tan, Mexico, at an approximate elevation of m. The site is situated in a low, scrubby thorn forest, 3 to 7 m high, dominated by various species of decid- uous legumes. Palms are absent. This vegetation type has been well described by Bequaert (1933), and illustrated by Paynter (1955). The Tunkas site lies within the very dry tropical forest for- mation of Holdridge (1967), and has a tropical w
An ecogeographic analysis of the herpetofauna of the Yucatan Peninsula ecogeographicana00leej Year: 1980 20 MISCELLANEOUS PUBLICATION MUSEUM OF NATURAL HISTORY Tunkas (20° 54' N, 88° 45' W), Yuca- tan, Mexico, at an approximate elevation of m. The site is situated in a low, scrubby thorn forest, 3 to 7 m high, dominated by various species of decid- uous legumes. Palms are absent. This vegetation type has been well described by Bequaert (1933), and illustrated by Paynter (1955). The Tunkas site lies within the very dry tropical forest for- mation of Holdridge (1967), and has a tropical wet-and-dry climate (Aw of the Koeppen classification; Vivo Escoto, 1964). I worked the Tunkas site from 25 to 31 October 1974. To characterize the precipitation re- gime at each site, I inferred the amount and seasonality of rainfall from records for nearby stations. For the Tunkas site I used data from Page (1933) for Izamal, located approximately 18 km to the west. For the Santa Rosa site I used data from Page (1933) for Peto, located approxi- mately 29 km to the northwest. For the Xpujil site I used unpublished data col- lected by Robert Wade for Zoh Laguna, approximately 15 km north of the village of Xpujil. For the Tikal site I used data from Page (1938) for El Paso de los Caballos, situated 67 km to the west. For both the La Libertad and El Ceibal sites I used data from Page (1938) for Paso Real, approximately 27 Ion south- southwest, and 14 km west of the two sites, respectively. For the Poptun site I used the data of Stuart (pers. comm.) for the village of Poptun, approximately km to the south. These data repre- sent records for as few as a single year (Poptun), five years (Paso Real), nine years (Izamal), ten years (Paso de los Caballos), 12 years (Peto), and 17 years (Zoh Laguna). The figures for annual precipitation are mean values. I used the percent of mean annual precipitation falling from May through October as a measure of seasonality of rainfall. For each
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