The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
Source: A new genus and new species of Baetidae (Ephemeroptera) from lakes and reservoirs in eastern North America
Diagnosis. The monotypic new genus is distinguishable from all other Baetidae by having the following combination of characters: somewhat truncate and expanded labial palp segment 3 (Fig. 7), variously developed lateral spinules on the abdomen (Gillies, 1990: Figs. 2, 3), laterally expanded abdominal segments (Fig. 8) and medial armature on the abdominal terga (Fig. 9).