spoof,
One August morning several years ago, I was on the West Branch Delaware at Hancock and watched as 2 guides cleaned out their drift boat. The evening before they had been in the midst of a 'white fly' hatch. I'm not exaggerating when I say that the entire bottom of the boat was covered with a yellowish scum. It was the eggs the female insects had laid. The guides told me the hatch was so thick that it was very hard to follow the fly pattern from among the naturals. They said a size 14 white Wulff worked well but also said that an odd color pattern (easier to see) was useful too. Anyway, here's a link to some info, and by-the-way, the Latin name for this insect is ephoron leukon.
http://www.wiflyfisher.com/ephoron-l...yfly-hatch.asp
Just noticed this link is same as post above.
Allan