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Observations of the Horned Curassow Pauxi unicomis in Amboro National Park, depto. Santa Cruz, Bolivia, allowed us to assess the status of a species whose habits in the wild were virtually unknown. Vocalizations, including call notes and the deep booming song, are described. Density was estimated by counting booming birds in the breeding season using a three-hide triangulation method. The study showed birds to be aggregated in one part of the study area. A nest of was found and the incubating female was observed for nine days: the individual incubated alone, left the nest at night, and returned at first light.Observaciones de la Pava Copete de Piedra (Pava Crista Azul) Pauxi unicomis en el Parque Nacional Amboró, depto. Santa Cruz, Bolivia, nos permitió evaluar el estado de una especie cuyo comportamiento en el ambiente silvestre es prácticamente desconocido. Se describen vocalizaciones, que incluyen notas de llamada “call notes” y el profundo canto de estampida “deep booming song.” Se estimó la densidad de las aves por conteo de los sonidos de estampida “booming birds” durante la estacion reproductiva, usando un método de triangulación con tres puestos de observatión. Este estudio mostró que las aves se agregaban en una parte del área del estudio. Se encontró un nido de Pauxi unicomis y al hembra fue observada durante nueve dias durante la incubación; la hembra incubaba sóla, dejaba el nido por la noche y regresaba a las primeras horas del amanecer.

Synopsis of the Bolivian species of Mimasyngenes Breuning, 1950 (Coleoptera, Cerambycidae, Desmiphorini) with two new species. M. multisetosus sp. nov. and M. lepidotus sp. nov. are described, and M. lineatipennis Breuning, 1950, M. venezuelensis Breuning, 1956, M. quiuira Galileo & Martins, 1996, and M. ytu Galileo & Martins, 1996 are redescribed; and these species illustrated. A key to species of Mimasyngenes is provided.

Oxylopsebus brachypterus new genus and species from humid tropical forest, Department of Santa Cruz, Bolivia is described and illustrated. Although with reduced elytra, the genus is placed in Oxycoleini based on the following characters: female urosternites modified, the first as long as the second to fourth together, the second with a brush for covering the eggs with detritus after being laid; the male with six visible urosternites, the first twice as long as the second; eyes with superior lobes; prothorax divergent behind, disc of pronotum with calli; procoxal cavities closed behind. Oxylopsebus gen. nov. would seem to fall between the Oxycoleini and Psebiini and be less closely related to the Obriini and Luscosmodicini, the four tribes in which the females have modified urosternites (the " Obriini group" sensu Martins, 2003). All the specimens were netted as they visited flowers of the vine Serjania lethalis (Sapindaceae).

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