. Bulletin. Natural history; Natural history. August. 1944 Ross: Caddis Flies of Illinois 275 this incision, somewhat fusiform and almost entirely membranous, with a slight constric- tion near base, the apex tapering to a sharp barbed point. Claspers short and wide, di- vided by an almost circular apical incision into two lobes; the dorsal lobe has a trun- cate apex, swollen dorsal margin, and a thick cluster of long, dark spines on its mesal face at apex; the ventral lobe has an oblique apex and a larger cluster of long, dark spines on its mesal face at apex. Aede- agus simple and filiform, t
. Bulletin. Natural history; Natural history. August. 1944 Ross: Caddis Flies of Illinois 275 this incision, somewhat fusiform and almost entirely membranous, with a slight constric- tion near base, the apex tapering to a sharp barbed point. Claspers short and wide, di- vided by an almost circular apical incision into two lobes; the dorsal lobe has a trun- cate apex, swollen dorsal margin, and a thick cluster of long, dark spines on its mesal face at apex; the ventral lobe has an oblique apex and a larger cluster of long, dark spines on its mesal face at apex. Aede- agus simple and filiform, typical for the genus. Female.—In size, color and general structure similar to male. Eighth sternite, hg. 922, set off distinctly from structures of the ninth, the apex wide and divided by a small U-shaped mesal incision into a pair of fairly large lobes which are clothed with long, scattered setae similar to those on the rest of the segment. Bursa copulatrix very long and shaped like a tuning fork, typical for the genus. Holotype, male. — Cloudy Creek near Cloudy, Oklahoma: May 4, 1940, Mrs. Roy Weddle. Allotype, female.—Same data as for holotype. Paratypes.—Same data as for holotype, U, 19. Ochrotrichia capitana new species This is one of the more primitive mem- bers of the genus, most closely related to xi'iia. It may be separated from this, how- ever, by the definitely marked sclerotized bands of the tenth tergite and the much different arrangement of the black spines on the inner face of the claspers. Male.—Length mm. General color and structure typical for genus. Genitalia as in fig. 923. Ninth segment annular, with a triangular apical incision on the dorsum for the reception of the tenth tergite. Tenth tergite long and narrow, the dorsal portion mostly semisclerotized with some definite, heavily sclerotized bands running along the dorsum; these converge at the apex and terminate in an upturned, spinelike process. Claspers more or less boot shaped and sim- il
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