Kaz: that matches my experience in CT time-wise. I confess that I have never seen any quantity of the adults on the surface. I believe most of them crawl to the shore to emerge on the rocks and walk around in the snow near shore. For years, I sort of discounted this hatch as not important, until a few years ago. I read about its importance in Maryland from Charlie Gelso and started experimenting with Charlie's Nymph (Feb. 2008 FOTM). On two occasions late year, once on the Farmington and once on a local wild brown trout stream, I did well with these flies. I believe the key is to make them dark and slender.