In the photo above -- the Giant stonefly Pteronarcys californica, the "Giant Salmon Fly," a species that does not occur in the East. I found this one in the Blackfoot River near Missoula, Montana this summer.
Photos of the Perlid and Perlodid species we find in our streams have been posted in earlier entries. These are photos of species from the other Plecoptera families.
Capniidae (Small Winter Stoneflies)
1. Allocapnia pgmaea. Size: ~5-10 mm. Season: Late Fall through Early Winter. Included are photos of more than one species.
3. Paracapnia angulata. Size: 6-8 mm: Season: Winter.
Leuctridae (Rolled-winged Stoneflies)
1. Leuctra. Size: 6-9 mm. Season: Late Fall through Winter (I've also seen some in the Summer, possibly a different genus or species).
1. Amphinemura delosa. Size: 5-8 mm; Season: Spring.
2. Prostoia completa. Size: 5-6 mm; Season: Winter.
3. Ostrocerca truncata? Size: 6 mm.
4. Soyedina sp. Size: 6.5-8.5 mm; Season: Winter.
1. Strophopteryx fasciata. Size: 9.5-10 mm; Season: Winter.
2. Taenionema atlanticum. Size: 6.5-11 mm. Season: Winter.
3. Taeniopteryx burksi/maura. Size: male, 8.7-9.5 mm: female, 10-12 mm; Season: Winter.
Chloroperlidae (Green Stoneflies)
1. Alloperla. Size: not given by Beaty; Season: Winter into Spring.
2. Haploperla brevis. Size: ~7 mm. Season: Winter into Spring.
Peltoperlidae (Roach-like Stoneflies)
1. Peltoperla. Size: 8-11 mm; Season: Winter and Spring.
2. Tallaperla. Size: 7-10 mm; Season: Winter and Spring.
Pteronarcyidae (Giant Stoneflies)
1. Pteronarcys biloba. Size: 35-50 mm; Season: Fall and Winter.
2. Pteronarcys proteus. Size: 35-50 mm; Season: Fall and Winter.