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Description:

Figures 8–18.Ptiloglossa tarsata (Friese, 1900). 8 General view of the nesting site at “La Florida” (Salta province), the arrow indicates the location of the nest; 9 Female of Ptiloglossa tarsata foraging in a flower of Solanum sp. 10 Tumulus of unconsolidated soil, scale line: 1 cm 11 General view showing the nest architecture with a cell at the end of the main tunnel 12 Group of scratches probably produced by female´s mandibles. The arrow indicates their location in the main tunne; 13(a) cell with cellophane-like lining and provisions, (b) neck and (c) entrance tunnel, scale line: 1 cm 14 One cell showing the cellophane-like lining on the wall, scale line: 1 cm 15 Spiral closure of one cell, scale line: 0.5 cm 16 Cocoon operculum with holes, scale line: 0.5 cm 17 Scanning electron micrograph of the cocoon operculum showing the fabric of silk threads with small circular holes, scale: 500 µm 18 Onecircular hole surrounded by silk threads, scale: 50 µm.