MCZ LIBRARY OCCASIONAL PAPERS of the JUN 2 9 1987 MUSEUM OF NATURAL HISTORY The University of Kansas HARVARD Lawrence, Kansas UNIVER SITY NUMBER 120, PAGES 1-11 15 OCTOBER 1986 A NEW SPECIES OF MARSUPIAL FROG (HYLIDAE: GASTROTHECA) FROM THE ANDES OF SOUTHERN COLOMBIA By William E. Duellman' and Patricia A. Burrowes^ Marsupial frogs of the genus Gastrotheca are widespread and diverse in the Andes of Colombia, Ecuador, and Peru. Most of the species in the high Andes of Colombia and Ecuador produce eggs that hatch as tadpoles, but two species— G. orophylax and plumbea—have eggs that develop directly into froglets (Duellman and Pyles, 1980). The other high Andean species include G. argenteovirens and G. aureomaculata in Colombia and G. cavia, lojana, monticola, and psychrophila in Ecuador, a complex of species in southern Colombia and Ecuador referred to G. riobambae. In 1979 Pedro M. Ruiz-C. of the Instituto de Ciencias Naturales in Bogota showed Duellman a series of Gastrotheca from the Valle de Sibundoy in the Cordillera Oriental in southern Colombia. Subsequent study of these specimens revealed that they represented an undescribed species. In 1984 we worked in the Valle de Sibundoy and obtained additional specimens. One of these provided tadpoles, some of which were raised through metamorphosis and are now small adults living in the laboratory. Pedro M. Ruiz-C, Director of the Instituto de Ciencias Naturales, Universidad Nacional de Colombia, has shared his knowledge of Colom-bian Gastrotheca with, and provided many specimens to, the senior author. We acknowledge Ruiz's helpfulness and contributions to a knowl-edge of Colombian anurans by associating his name with the new species. ' Curator, Division of Herpetology, Museum of Natural History, and Professor, Department of Systematics and Ecology, The University of Kansas, Lawrence, Kansas 66045. ' Research Assistant, Division of Herpetology, Museum of Natural History, The University of Kansas, Lawrence, Kansas 66045.