ADVERTISEMENT CALLS OF 4 MICROHYLID FROGS FROM BOLIVIA (AMPHIBIA, ANURA)

Advertisement calls of four anuran species in the family Microhylidae from Bolivia are described, including information on calling behavior, A characteristic audiospectrogram and oscillogram are presented for e ach species. Numerical information about the spectral and temporal fea tures of the calls is provided. The calls of Chiasmocleis albopunctata and Elachistocleis bicolor are described for the first time. Calls of Elachistocleis ovalis and Hamptophryne boliviana are compared with pr eviously described calls of the same species from other locations. The call of C. albopunctata has the basic structure present in other memb ers of the genus, resembling an orthopteran sound. The call of E. bico lor is higher pitched than that of E. ovalis. The calls of H. bolivian a from populations in Bolivia and Peru show great similarity.