This wasp like creature is a hover fly (Family Syrphidae Order Diptera) mimicking a wasp. They can be distinguished as it only has one pair of wings, a wasp has two. I had not noticed them before in my garden, but in 2001 there were many of them eating the pollen on a number of my passion flowers. As they go from plant to plant there is also the possiblility that they act as pollinators. This one is stealing pollen from a P. colinvauxii in July 2006.