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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.
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Mayfly Species Paraleptophlebia ontario

Where & when

In 17 records from GBIF, adults of this species have been collected during May (41%), June (29%), and July (29%).

In 1 record from GBIF, this species has been collected at elevation of 758 ft.

Species Range

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: 6 mm
Wing length: 7 mm

This is another small clear-winged species of rich red-brown color and bi-colored abdomen. Head, thorax and both ends of abdomen brown. Legs pale brown with only the front femur a little darker. Wings hyaline with the radial vein pale brown, darker at the root. Costal cross veins obsolete, nearly so even in the stigmatic area where they are simple and but little curved.

Middle abdominal segments obscurely paler across the base of the dorsum and on the sides beneath the mid-lateral carina; end segments darker above. Genitalia and tails somewhat brownish at the base. Penes separated by a rather narrowly U-shaped cleft, truncate on the apex in a sinuous line that ends externally in a recurved tooth. Reflexed spurs very short, hardly longer than the depth of the notch, curved and blunt at the tip (see fig. 133).

Start a Discussion of Paraleptophlebia ontario


  • Needham, James G., Jay R. Traver, and Yin-Chi Hsu. 1935. The Biology of Mayflies. Comstock Publishing Company, Inc.

Mayfly Species Paraleptophlebia ontario

Species Range
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