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.
Option 1 | Option 2 |
---|---|
Apical lacinial tooth about as long as rest of lacinia (sf 16.152) | Apical lacinial tooth much shorter than rest of lacinia (sf 16.154) |
Mesosternal Y-arms with secondary furrows extending to anterior corners of furcal pits (sf 16.153) | Mesosternal Y-arms lacking secondary furrows extending to anterior corners of furcal pits |
British Columbia, California, Oregon, Washington | |
Remaining genera: Isoperla and Susulus | |
1 Example SpecimenThis nymph keys out to Osobenus yakimae, and a comparison of the markings with a specimen on flyfishingentomology.com provides a good verification. The size is about right, as that species has been described as 12 mm. The markings generally fit the original description of the nymph of that species (Jewett 1955) perfectly.
| 5 Example Specimens |
Osobenus Species Osobenus yakimae | Go to Couplet 13 |