This Eupeodes was found dead on a Stream Orchid at 1000 Palms Oasis. It looks almost exactly like a Syrphus americanus (now Eupeodes americanus) illustrated in Essig's Insects and Mites of Western North America, p. 568, included a fungus Empusa muscae, all the white stuff between the yellow bands.These spores also extend on the lateral margins of the abdomen, exactly as Essig states. I don't know how many other syphids look this this.