[stohn-flahy] 
| any of numerous dull-colored primitive aquatic insects of the order Plecoptera, having a distinctive flattened body shape: a major food source for game fish, esp. bass and trout, which makes them popular as models for fishing flies. |
| stone·fly (stōn'flī') n. Any of numerous weak-flying insects of the order Plecoptera, whose flat, elongated nymphs live under stones along the banks of streams. Adult and larval stoneflies are used as fishing bait. Also called plecopteran. |
