A Mormon bug is a type of terrestrial grasshopper or something that hatches in May/June out there in the area around Vernal (where there is good arrowhead hunting, BTW). We used big Sofa Pillow flies and slapped them down on the water. Supposedly these are the same hoppers that about wiped out the farms back in the 1800's, but the farmers were saved by gulls from the Great Salt Lake flying in to eat them. When a really good hatch of them happens all serious fly fishermen head toward Flaming Gorge.
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