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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Dorsal view of a Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Caddisfly Genus Polycentropus (Brown Checkered Summer Sedges)

See Polycentropus cinereus for details. Of the nearly four dozen species in this genus, only it has been mentioned as significant to fly anglers.

Where & when

In 430 records from GBIF, adults of this genus have mostly been collected during June (37%), July (26%), May (14%), and August (13%).

In 113 records from GBIF, this genus has been collected at elevations ranging from 33 to 10663 ft, with an average (median) of 1781 ft.

Genus Range

Specimens of the Caddisfly Genus Polycentropus

1 Larva

Start a Discussion of Polycentropus


Caddisfly Genus Polycentropus (Brown Checkered Summer Sedges)

Species in Polycentropus
Polycentropus cinereus
Species in Polycentropus: Polycentropus cinereus
28 species (Polycentropus alabamensis, Polycentropus arizonensis, Polycentropus barri, Polycentropus blicklei, Polycentropus carlsoni, Polycentropus carolinensis, Polycentropus centralis, Polycentropus chelatus, Polycentropus chellus, Polycentropus chenoides, Polycentropus colei, Polycentropus confusus, Polycentropus denningi, Polycentropus elarus, Polycentropus floridensis, Polycentropus gertschi, Polycentropus halidus, Polycentropus maculatus, Polycentropus magnica, Polycentropus neiswanderi, Polycentropus pentus, Polycentropus pixi, Polycentropus rickeri, Polycentropus sabulosus, Polycentropus thaxtoni, Polycentropus variegatus, Polycentropus vernus, and Polycentropus vigilatrix) aren't included.
Genus Range
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