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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.

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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Mayfly Species Paraleptophlebia strigula (Blue Quills)

This species often hatches together with Paraleptophlebia mollis and Paraleptophlebia guttata.

Where & when

Time of year : June through August

In 25 records from GBIF, adults of this species have mostly been collected during July (44%), August (40%), and June (12%).

Species Range

Hatching behavior

Time of day : Morning

Habitat: Fast water

The emerged duns rest on the surface for a while before taking flight.

Physical description

Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.

Male Spinner

Body length: 7 mm
Wing length: 7 mm

This species has a pale abdomen shaded with brown; it is close to Paraleptophlebia guttata.

Head and thorax deep blackish, the pleura tinged with brown. Legs whitish. Fore femora tinged with brown throughout; middle and hind femora brown-tinged apically, with the knee brown. Wings hyaline, veins pale. Thorax deep red-brown. Legs pale amber. Longitudinal veins faintly amber-colored.

Abdomen of male whitish hyaline on segments 2-6 and the anterior portion of 7; tergite 2 with considerable dark shading. Apical segments opaque, deep chocolate brown. A short black transverse streak on the postero-lateral corner of segments 2-6, which often has some slight brown suffusion anterior to it, distinguishes this species from P. guttata; in the latter, black lateral dots are present instead of the black streaks. Tails and forceps whitish, faintly brown-tinged at the base. Penes very similar to guttata, but convergent, not divergent apically; the beak-like lateral projections are somewhat shorter and the ribbon-like reflexed spurs longer. (See fig. 133)The subanal plate with a deep narrow U-shaped apical excavation.

Female Spinner

Head of female red-brown, vertex shaded with black. Abdomen of female deep red-brown.

Start a Discussion of Paraleptophlebia strigula


Mayfly Species Paraleptophlebia strigula (Blue Quills)

Species Range
Common Name
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