Common Banded Hoverfly (Syrphus ribesii: Syrphidae) Size 8.1-13.3 mm (0.32-0.52 in). San Isidro Lodge, San Isidro Reserve, Quijos Valley, Napo Province, Ecuador. Eastern-slope of the Andes near Cosanga in a mid-elevation montane forest (cloud forest) at about 2,000 m (6,560 ft) elevation.