Isoperla petersoni Needham & Christenson 1927

Isoperla petersoni Needham and Christenson
Isoperla petersoni Needham and Christenson, 1927, 201. Type locality — Peterson's Spring, head of Logan R., Cache Co., Utah, USA (no type designation, habitus, adult male and nymph).
Isoperla fontium Neave, 1929, 4:161. Holotype $, and allotype $, Maligne Lake, Alberta, CANADA (CNM) (nymphal mandible, maxillae, male and female genitalia, and sclerotized aedeagal process). Syn. Ricker, 1954.
Isoperla petersoni, Needham (in Claassen), 1937, 69:81 designation of holotype S , and allotype ? , Peterson's Spring, head of Logan R., Cache Co., Utah, USA (Cu #1,687) (male and female genitalia, aedeagus, and adult head-pronotal pattern ) .
Isoperla fontium, Claassen, 1940, 232:200.
Isoperla petersoni, Claassen, 1940, 232:204.
Isoperla petersoni, Ricker, 1954, 51:39. Syn. indicated.
Isoperla petersoni, lilies, 1966:415.
Isoperla petersoni, Zwick, 1973:250.
Additional references: Isoperla petersoni, Claassen, 1931 (nymphal habitus); Knowlton and Harmston, 1938; Jewett, 1959 (male genitalia and aedeagus); Ricker, 1964; Gaufin, 1964; Knight et al., 1965b (ova); Gaufin et al., 1966 (male and female genitalia, and sclerotized aedeagal process); Nebeker and Gaufin, 1966; Baumann, 1971; Gaufin et al., 1972 (male and female genitalia; and sclerotized aedeagal process); Ricker and Scudder, 1975; Baumann et al., 1977 (male and female genitalia, and sclerotized aedeagal process). /. fontium, Ricker, 1943 (adult head-pronotal pattern), 1944.
Male. — Macropterous-brachypterous. Length of forewings (macropterous) 9.0-10.5 mm; length of body 8.0-12.5 mm; length of forewings (brachypterous) 1.42.0 mm, length of body 7.5-9.5 mm. General body color dark brown. Interocellar area of head dark brown, forming equilateral triangle between ocelli; broad, diffuse brown "Y"-shaped band enclosing equilateral triangle and extending from base of antennae to occiput (Fig. 204). Pronotum medium brown, median light stripe, rugosities dark brown (Fig. 204). Wings fumose, veins dark brown. Long ventral hair at posterior margin of cereal segments. "C"-shaped paraprocts (laterally) stout, tapering slightly toward apex, apex blunt, distinctively deflected downward to a point, recurving anteriorly to level of 10th tergum, dorsal surface bearing small fine hairs; anterior tooth near base (Fig. 205). Vesicle constricted at base, posterior margin rounded, few small fine hairs at base, slightly lighter than rest of segment (Fig. 208). Aedeagus with mesodorsal conical-shaped lobe void of spinulae, bearing posterior projecting sclerotized process, bifurcate at base; dorsal arm developed into single long, curved, tapered, striolate, needle-like rod (Fig. 207C), patch of long, hair-like spinulae under process, continuing as narrow band down posterior margin (Fig.