We present new data on the ecology of a high-altitude population of M. dorsivittata, at the Itatiaia National Park in south-eastern Brazil, based on 16 lizards collected in February 2000. Litter size for five mature females was 3-4. Body temperatures of eight lizards averaged 29.1 +/- 3.4 degreesC and was positively correlated with air and substrate temperatures. M. dorsivittata consumed a range of arthropods, with no clear dominance of any one prey category.142109112