Isoperla rainiera Jewett 1954

Isoperla rainiera Jewett
Isoperla rainiera Jewett, 1954a, 11:549. Holotype $, Mount Rainier National Park, Pierce Co., Washington, USA (CWS) (male vesicle and aedeagal sclerotized process).
Isoperla rainiera, Jewett, 1962, 38:19. Allotype $, Trib. of Salmon R., Mt. Hood, Clackamas Co., Oregon, USA (CAS) (female genitalia).
Isoperla rainiera, lilies, 1966:417.
Additional references: Isoperla rainiera, Jewett, 1960 (aedeagal sclerotized process).
Male. — Macropterous. Length of forewings 8.5-9.0 mm; length of body 8.0-9.0 mm. General body color dark brown. Interocellar area of head completely dark brown, forming equilateral triangle between ocelli, diffuse, medium brown broad, "T"-shaped pigment band connecting bases of antennae and mesoposterior margin of head, enclosing ocellar triangle; two large light yellow spots between compound eyes (Fig. 210). Pronotum medium brown, light yellow median stripe, and numerous dark brown rugosities (Fig. 210). Dorsum of mesoand metathorax very dark. Antennae and legs dark brown, cerci light with long ventral hair at posterior margin. Wings fumose, veins dark brown. Abdominal terga with 8 faint rows of longitudinal dots, 2 mesal and 3 each laterally. Vesicle constricted at base, expanded at apex, evenly rounded at posterior margin, with few small, fine hairs (Fig. 213). Paraprocts wide at base, tapering to sharp, fine points apically, dorsoposterior surface bearing small, fine hairs; curved forward to level of 10th tergum (Figs. 215 & 216). Aedeagus tubular, posterodorsal sclerotized process with short bifurcate base, apex of dorsal arm expanded, evenly rounded, with 2 sharp, lateral downward deflecting spines
face (Fig. 218F); large apical lobe, anteroventral margin with smaller lobe void of spinulae (Fig. 218B), small mesodorsal lobe anterior to sclerotized process bearing small, fine, hair-like spinulae (Fig. 218E); mesal section with band of small, rounded spinulae (Fig. 218A), and band of small, stout spinulae extending from posterior margin to mesal section (Fig. 21 8C).
Female. — Macropterous. Length of forewings 9.4-10.4 mm; length of body 9.0-10.9 mm. General body color and head-pronotal pigment patterns similar to male. Subgenital plate wide at base, evenly rounded posteriorly, produced approximately 1/4 length of 9th sternum (Fig. 217).
Nymph (Reared). — Length of mature male nymph 9.5-10.5 mm; length of mature female nymph 10.0-11.4 mm. Interocellar area of head dark brown, 2 light yellow areas inside and behind each compound eye, with scattered, long, fine hairs; posterior margin of head mostly light yellow, head pattern of numerous narrow black pigment bands (Fig. 212). Pronotum medium brown, broad median light yellow stripe, lateral rugosities dark brown; margin fringed with small, stout hairs, occasional long hairs at upper and lower angles (Fig. 212). Femora, tibiae, and tarsi without typical dorsal fringe of long, fine hairs, outer surfaces with scattered, long, spine-like setae (Fig. 219). Pro-, meso-, and metathoracic sterna with median patch of long, golden brown setae, metasternal patch broadest (Fig. 211). Ventrum of abdomen cream yellow, dorsum mostly dark brown, with light, narrow median stripe. Cereal segments with whorl of short, stout hairs, and one long ventral hair at posterior margin.