. Bulletin. Natural history; Natural history. March ]^iH ROSS: NEARCTIC CADDIS FLIES 141 White River, Mohr & Burks, 2d', 19. Porters- ville: June 3, 1936, along East Fork River, Mohr & Burks, acf. Shoals: Sept. 10, 1936, along White River, Ross & Burks, l<f. Iowa.—Ottumwa: August 2, 1936, H. H. Ross, Scf. Wisconsin.—The Dells: June 5, 1936, along Wisconsin River, Prison Sz Ross, IScf. Hydropsyche comuta new species Closely allied to scalaris and simulaiis, differing in the wide mesal plates of the oedagus and other small details of the genitalia. Male.—Length 12 mm. Color as des
. Bulletin. Natural history; Natural history. March ]^iH ROSS: NEARCTIC CADDIS FLIES 141 White River, Mohr & Burks, 2d', 19. Porters- ville: June 3, 1936, along East Fork River, Mohr & Burks, acf. Shoals: Sept. 10, 1936, along White River, Ross & Burks, l<f. Iowa.—Ottumwa: August 2, 1936, H. H. Ross, Scf. Wisconsin.—The Dells: June 5, 1936, along Wisconsin River, Prison Sz Ross, IScf. Hydropsyche comuta new species Closely allied to scalaris and simulaiis, differing in the wide mesal plates of the oedagus and other small details of the genitalia. Male.—Length 12 mm. Color as described for simulans, but with slightly. ^9 Sternite $ Tergites Fig. 66.— Hydropsyche cornula less contrast in the pattern. General structure same as for this species also, with the exception of the eyes, which are smaller, being only half as wide as the distance between them. Genitalia as in fig. 66. Suture separ- ating ninth and tenth terga present at the sides only. Median ridge of ninth tergum short and narrow, with a row of long setae just below it on each side. Tenth tergum wide, with a wide \'- shaped incision on the meson, the lateral lobes more or less pointed and each having small setae on the mesal and apical regions; lateral portions with a pair of setiterous warts on each side bearing scattered, long setae. Seen from the side, the tenth segment ap- pears declivous and pointed at apex. Clasper sinuate; apical segment hooked upward at apex. Oedagus curved at base, middle portion cylindrical, apex slightly upturned and pointed; mesal plates wide and low, close together on the ventral side; ventral cavity orbicu- lar, the lateral processes of the apex widest near apex and almost touching along the meson. Female.—Length 13 mm. Similar to male in color and general structure, differing in antigenetic characters of genitalia. Eighth tergite without a brush ot strong setae. Eighth sternite divided into two lateral lobes, the mesal incision only half the length of t
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
