Deadly embrace

Was out photographing Iris japonica at Aoyoma cemetery in Tokyo and saw this hoverfly (Syrphidae) on the petal of the flower. All of the sudden, this robber fly descended and grabbed the hoverfly in a deadly embrace. The robber fly landed on this iris bud and proceeded to inject toxins/enzymes into the hover fly, first into the thorax and later into the abdomen as shown in this picture. You can actually see the faint proboscis in the thoracic cavity.

D90 Nikkor 105mm iso 640 F11 1/25 sec, early morning sunlight with reflected fill light using a piece of A4 white paper, tripod cable release.