Mike,
They're called Jitterbees. Fantastic for panfish in warmwater. Here's the instructions to tie:
[url=http://www.laflyfish.com/flies/jitterbee.php:0a4d1]http://www.laflyfish.com/flies/jitterbee.php[/url:0a4d1]
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[url=http://www.native-waters.com:0a4d1]http://www.native-waters.com[/url:0a4d1]