Nests of Sceliphron fistularium were obtained in Colombia and Moji Guaçu, São Paulo, Brazil. Complete nests consisted of 1 to 54 sausage-shaped cells, arranged side by side along a horizontal axis, and found attached to electrical wires (Colombia, n = 7) and walls (Colombia, n = 4 and Moji Guaçu, n = 4). The number of cells per nest ranged from 1 to 54, their length varying from 20.8 to 29.7 mm...