Abstract
Nests of Centris vittata were obtained from trap-nests at Santa Carlota Farm, Cajuru, SP, Brazil. The bees nested in bamboo canes ranging from 8.5 to 24.7 cm in length and from 0.9 to 1.9 cm in diameter. The bees constructed their nests with a mixture of soil and an oily substance. Com- pleted nests had 1-8 urn-shaped cells arranged in a linear series, separated by a space filled with loose soil. The nest plugs resembled the bottoms of cells and were externally covered with an oily mate- rial. In some cases they were also covered with an another yellowish, sticky substance of unknown origin. The innermost cells of the nests produced females and the outermost cells males, resulting in proterandry. Females were significantly larger than males, and no dimorphism in males was found. Nests were parasitized by the megachilid bee, Coelioxys sp., the bombyliid fly, Anthrax sp. and by meloid beetles. C. vittata nested exclusively in the hot and wet season (September-April), produc- ing at least two generations. © Inra/DIB/AGIB/Elsevier, Paris
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