Chetty,
the top photo is a caddis larva from the case maker category,not sure if its glossoma or limnephilidae but they are also found all over the pocono streams,cases are made of small stick and twig debris,also they get close toinch and a half long .the second photo is of a mayfly nymph,its wing case isnt dark yet so it has time till it will hatch,its a member of the clinger family which could be a rithrogena,heptagenia,or stenonema, these nymphs tied in sizes #10,#12,#14,#16 ala oliver edwards style wiork extremely well. try to tie all your flies as close to color of the natural when fishing extremely pressured streams.always wet the tying medium to see what color it gets when wet or when treated withh sinkant or floatant.then when you are as close as your eyes determine the color it is tie the fly.
Tight Wraps & Tight Lines
Rick Wallace
P.S. i tie my cased caddis of that particular species on a mustad 79580 .