Rene, just to add to what Greg wrote, there are several species of
diving caddis, Phryganea or Rush Sedge is another. They are called that
because the adults actually dive from the air in order to break through
the surface film and swim to the bottom to lay eggs. On a small scale,
it's actually quite spectacular when scores of these insects are dive
bombing the surface all around you. 
Cheers,
Paul
http://www.galesendpress.com
-- 
Paul Marriner
Outdoor Writing & Photography. Member OWAA & OWC. Author of Stillwater
Fly Fishing: Tools & Tactics (Print [NEW] & CD), Modern Atlantic Salmon
Flies, Miramichi River Journal, Ausable River Journal, and Atlantic
Salmon.

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