(4) Isoperla bifurcata,

Plumas Co., CA, Domingo Spring (DS), Domingo Springs Campground, 8 mi (12.9 km) NW Chester on Old Red Bluff Rd., 01-X-2006 (♂ ♀ reared), 20-VI-2008 (♂ ♀ field collected); Mosquito Spring creek (MS), 0.4 mi (0.6 km) E of Domingo Spring Campground, 7.4 mi (11.9 km) W of Chester, (19- & 28)- V-2007 (♂ ♀ reared); Tehama Co., CA, Spring Tributary of Gurnsey Creek, (STGC) Gurnsey Creek Campground, Hwy 36, 2.3 mi (3.7 km) N Hwy 32 intersection, 26-IV-2010, 15-V-2010 (♂ ♀ reared) .