Isoperla jewetti Szczytko & Stewart 1976

Isoperla jewetti Szczytko and Stewart
Isoperla longiseta, Frison, 1942, 22:318. In part.
Isoperla jewetti Szczytko and Stewart, 1976, 36:215. Holotype $, and Allotype 9; 5-10 mi. S. of El Paso, on rd. to Marathon, El Paso Co., Texas, USA, (INHS) (male and female genitalia, aedeagus, nymphal mouthparts, and ova).
Isoperla jewetti, Szczytko and Stewart, 1977, 103:355 (male and female genitalia, aedeagus, nymphal mouthparts, and ova).
Male. — Brachypterous. Length of forewings 1.5-2.0 mm; length of body 6-7 mm. General body color light brown. Head-pronotal pigment pattern similar to /. longiseta (Fig. 3). Ninth tergum with bipartite patch of stout setae and dark brown pigmentation. Tenth tergum with 2 dark brown patches void of setae at posterior margin (Szczytko and Stewart 1976; Fig. 10). Vesicle, broader at base than apex (Szczytko and Stewart 1976; Fig. 9). Paraprocts slender, tapering to points apically, and recurving anteriorly, slightly over 10th tergum (Szczytko and Stewart 1976; Figs. 10 & 11). Aedeagus entirely membranous with long dorsal finger-like process (Szczytko and Stewart 1976; Fig. 11).
Female. — Macropterous. Length of forewings 8-9 mm; length of body 6-9 mm. General body color, and head-pronotal pigmentation similar to male. Subgenital plate truncate posteriorly, lateral margins parallel with sides of abdomen (Szczytko and Stewart 1976; Fig. 12).
Nymph (reared). — Length of mature nymph 8-9 mm. Description essentially the same as for /. longiseta (Fig. 5) (see diagnosis under /. longiseta).
Ova. — General shape oval, cross section circular (Szczytko and Stewart 1977; Fig. 16). Collar reduced, chorion covered with evenly spaced punctations, ridges reduced, micropyles arranged in pairs or threes near bottom 1/2, on one side.
Material examined. — TYPES: Holotype $, allotype, and 6 3, 17 2, and 2 exuvia; paratypes, TEXAS, El Paso Co., 5-10 mi. S. of El Paso, on rd. to Marathon, in Tamarix along irrigation ditch, 22/IV/1939, J. A. and H. H. Ross (INHS). Additional specimens — COLORADO: Huerfano Co., La Veta Pass, 21/VII/1938, D. J. and J. N. Knull, 1 $ (INHS).
Distribution. — USA: COLORADO and TEXAS (Fig. 2).

Isoperla jewetti és una espècie d'insecte plecòpter pertanyent a la família dels perlòdids.