These are two Jack Gartside patterns. They are tied to imitate emerging insects. As I have mentioned earlier he used aftershafts in many of his flies. Aftershafts are not the easiest material to use. Keep in mind that the aftershaft feather has a very fragile stem. If you find it difficult you can try using a electric gripping tool rather than a traditional hackle plier. They are also called EZ pliers. Always use a fairly gentle touch when winding these feathers.
This is the Philo Mayfly Emerger.
This is the Philo Caddis Emerger. This pattern also works very well when weighted. Both these flies should be tied in various colours and sizes to match the naturals.