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Dobsonflies

Scientific Name
MatchScientific Name
****Corydalus

Dobsonflies and their predatory larvae, the hellgrammites, are among the largest trout stream insects. They are best known as a good excuse for the rigid imitationist to fish a wooly bugger.


This common name refers to only one genus.

Hellgrammite Genus Corydalus

These are pretty much always called Dobsonflies.
The largest and most well-known hellgrammites belong to this genus, although in my collecting experiences the fishflies of Nigronia seem to be more common in trout streams.
Corydalus (Dobsonflies) Hellgrammite LarvaCorydalus (Dobsonflies) Hellgrammite Larva View 27 Pictures
Collected May 29, 2007 from in
Added to Troutnut.com by on June 4, 2007
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