This happened Monday, so I’m a little late with the post, but my first rose blooms always mean there are Light Cahills on the lower end of the Farmington. The hatch is already progressing upstream. Call them what you want (Vitreus, sulphurs, etc.) — I see these first signs of summer as simple creamy mayflies, and I go with the generic term of Light Cahill, which suits me just fine.
Remember, you are matching size, color, and profile. These first invaders are usually a size 14-16 — sometimes you get a big 12. For dry flies I like the classic Catskills Light Cahill, the Pale Watery Wingless AKA The Magic Fly, and the Usual. For wets, the Light Cahill winged, the Pale Watery Wingless, and the Partridge and Light Cahill. Any of the creamy Leisenring or North Country patterns will also serve you well.