The objectives of this research were to identify remarkable aspects of the ecology of O. corvinus, and to describe its immature stages (eggs, larvae and pupa). Four field trips were made during may to december 2007, to the plantations of native woody trees, in the community of Sardinilla, Province of Colon. Once nests were located (winding or folding of individual leaves), ecological observations were made and later nests were collected according to its degree of development (from oviposition to emergence of adults). Nests were placed into eclosional chambers, then taken to the laboratory and kept between 18°C-25°C, and at 65%-80% humidity. Measurements of the nests were taken and immature stages (egg, larva and pupa) were described until its biological cycle had been completed. The possible associations of O. corvinus with the following insects: larvae stage of Staphylinidae (Coleoptera) and Monochaetoscinella sp. (Diptera: Chloropidae: Oscinellinae), found inside the nests were determined as facultative inmates, and a live chant was done of the immature stages of O. corvinus. Its biological life cycle has duration of 15 days, from oviposition until emergence of an adult. The highest mortality rate occurred on the second (10,94 %) and third larvae stage (14,06%).
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