. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 161 as Ion third 0-2-2 apex, g as wide and no longer than the antennal segment. Spur torimila . Front wings slender, pointed at radial sector ,(? Genitalia Fig. 97. [.rplocenis oligiiis media two-branched; hind wings also narrow and pointed, with Cui branched. Genitalia as in fig. 97. Tenth tergite divided into two processes whose basal two-fifths are broad and contiguous on meson; the apical three-filths narrow, slender filaments slightly thickened and sinuate before apex, the constriction oc
. Bulletin. Natural history; Natural history. March 1938 ROSS: NEARCTIC CADDIS FLIES 161 as Ion third 0-2-2 apex, g as wide and no longer than the antennal segment. Spur torimila . Front wings slender, pointed at radial sector ,(? Genitalia Fig. 97. [.rplocenis oligiiis media two-branched; hind wings also narrow and pointed, with Cui branched. Genitalia as in fig. 97. Tenth tergite divided into two processes whose basal two-fifths are broad and contiguous on meson; the apical three-filths narrow, slender filaments slightly thickened and sinuate before apex, the constriction occurring abruptly. Claspers divided into a ventro-mesal, quadrate lobe slightly emarginate at the apex, and a long, fingerlike, dorso-lateral lobe with a pair of toothlike processes at apex. From the baso-mesal angle of each clasper arises a sclerotized plate joining the base of the oedagus. The entire clasper is clothed with long, fine setae. Oedagus arcuate with basal portion sclerotized and with a sharp ventral process near the height of its arc, the apical portion semimembranous; from each side at base arises a sclerotized filament which curves back to the base of the ninth segment, then curves up and follows oedagus to its apex, the two processes being similar. Female.—Similar in size, color and general structure to male, differing in characters of the genitalia, fig. 97. Ninth tergite cylindrical and heavily sclerotized. Tenth tergite carinate on meson, broad at base, the apical half tapering to a triangular and pointed apex. Below this on each side is a spatu- late, clasperlike process constricted at the base; between these is a moundlike structure formed of two lateral plates open above and fused ventrally. The sternal plate is somewhat produced, its apical margin forming one mesal and two lateral pointed projections. A pair of invaginated, spindlelike structures lie just above the venter and extend halt- way into the eighth segment. Holotype, male.—Wilmington, Illin
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
