Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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Troutboomer on Mar 23, 2010March 23rd, 2010, 2:19 am EDT
There are grannoms aplenty in the Bald Eagle, however by May 20th there are no grannoms on any of our central Pa streams. More likely Ryacophila (green rock worms)size 14/12, which can emerge throughout late April and May, or Hydropsyche,size 16/18 with a tan wing and a cinnamon body. The trout behavior you describe is common on the Little Juniata. In either case, fishing a pupa in the film is the way to go, especially for Hydropsyche. They spend hours struggling in the film before emerging.
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