Isoperla mormona Banks

(Figs. 10 a-d)

Isoperla mormona Banks 1920 .

Holotype ♀, Utah, Utah County, Vinyard.

Male. Aedeagus: sclerotized posterior process absent; body a long recurved tube with one small dorsoanterior lobe, tapering to a multi-lobed apex (Figs. 10 a-b); a thin light dorsoapical band of fine spinulae concentrated somewhat above bi-lobed tip (Figs. 10 a-b). Mesoposterior area of ninth tergum with bipartite patches of stout dark spinulae and long fine scattered setae, tenth tergum without spinulae (Fig. 10c). Posterolateral margins of at least abdominal segment 8 with scale-like setae clustered in brushes of several setae. Paraprocts: curved dorsally, length if straightened subequal to combined first and second cercal segments, tapering abruptly to blunt apices (Fig. 10c). Vesicle: trapezoid shaped, length subequal to width, constricted near base with tapered and straight lateral margins (base wider than apex), apex truncate (Fig. 10d).

Isoperla mormona is most similar to I. acula and I. quinquepunctata (Table 1). See comments under I. acula .

Additional Material Examined. CALIFORNIA, Inyo Co., Rawson Creek, 1.1 mi (1.8 km) above Gerkin Rd, ~ 7.5 mi (12.1 km) S Bishop (Hwy 395), 37.28640°N, 118.40420°W, 25/VII/2012, larvae (ABLC) . San Diego Co., Santa Ysebel Creek, 2 mi (3.2 km) S Dan Price Creek, 29/ V /2011, larvae (ABLC). OREGON, Harney Co., Trout Creek, NFD 395 Rd 4.25 mi (6.8 km) E Idlewild CG (Hwy 395), 43.80484°N, 118.91082°W, 21/ V /2013, J.B. Sandberg, B.C. Kondratieff, 4 larva; Klamath Co., Sprague River, Hwy 140 unnamed access 4.74 mi (7.6 km) E Beatty, 42.44096°N, 121.18719°W, 19/ V /2013, J.B. Sandberg, B.C. Kondratieff, 1♂ (JBSC).