. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 269 almost truncate and having a scattering of medium length setae; apical segment short and boot shaped, the dorsal heel small and pointed, the ventral toe large and somewhat triangular, with a brush of short setae on. Fig. 909.—Rhyacophila harmstoni, male genitalia, ji, lateral aspect; B, tenth tergite; C and D aedeagus, respectively lateral and ventral aspects. the inner margin at apex. Aedeagus with dorsal portion very narrow, ventral portion expanded and wider; armature consisting of a mesal style wh
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 269 almost truncate and having a scattering of medium length setae; apical segment short and boot shaped, the dorsal heel small and pointed, the ventral toe large and somewhat triangular, with a brush of short setae on. Fig. 909.—Rhyacophila harmstoni, male genitalia, ji, lateral aspect; B, tenth tergite; C and D aedeagus, respectively lateral and ventral aspects. the inner margin at apex. Aedeagus with dorsal portion very narrow, ventral portion expanded and wider; armature consisting of a mesal style which is widest at base and tapers rather rapidly to a slender straight apex, flanked on each side by a curved cluster of three or four spines fused on basal portion and sinuate at apex. Holotype, male. — Strawberry Valley, Utah: July 15, 1938, Knowlton & Harm- ston. A gapetus iridis new species This species is most closely related to pinatus, differing from it in the truncate lateral aspect of the claspers and the con- formation of the tenth tergite. Male.—Length 5 mm. Color dark brown, the legs beyond coxae whitish yellow with black spurs. General structure typical for genus. Genitalia as in fig. 910. Ninth seg- ment cylindrical, its posterior margin trun- cate laterad and incised almost to the base on the dorsum. Cerci long and slender with a dorsal brush of long setae. Tenth tergite very long, the basal part robust, tapering. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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