| Resumo: |
Centris (Ptilotopus) are large bees and important pollinators in the Neotropical region. Its biology and behavior is still poorly known and only a few observations have been published. In this paper, observations on the biology of C. (Ptilotopus) scopipes Friese, 1899, a species that occurs in the "cerrados" of Brazil, are presented. The study was conducted in the Estação Ecológica de Jataí, in Luiz Antônio, São Paulo, during the active period of the adults (November through April). Females collected pollen from flowers of Solanaceae and Caesalpiniaceae, by vibration, and floral oils from Malpighiaceae belonging to the genera Byrsonima, Banisteriopsis, Stigmaphyllon and Peixotoa. Floral resources are carried in the hind leg scopae to the nests, which are excavated in the walls of epigeous nests of the termite Procornitermes araujoi Emerson, 1952 (Termitidae, Nasutitermitinae). The main tunnel entered the termite nest at an ascending angle ending in a vestibulum. Two parallel, vertical burrows forming linear series of cells descended from the vestibulum. The upper cell (the nearest to the nest entrance) was filled with soil. This might represent a protection against parasites. During the study, one female of Acanthopus excellens Schrottky, 1902 (Apidae, Ericrocidini), a cleptoparasitic bee, was captured when leaving one of the nests. A male of C. scopipes emerged eleven months after cell closure, suggesting a univoltine cycle for this species.
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