Hex Mayflies
Hexagenia limbata
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.
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With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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Definition of 'medial crossvein' in Caddisflies
Definition of 'medial crossvein' in Caddisflies
Medial crossvein: In caddisfly wings, the medial crossvein (denoted m) connects the anterior branch MA and posterior branch MP of the media and forms the apical edge of the medial cell.
These other words reference the same concept: m, crossvein m, m crossvein.
This Hydatophylax argus caddisfly does not have a medial crossvein, so I filled in where one would be in purple.
These other words reference the same concept: m, crossvein m, m crossvein.