. Bulletin. Natural history; Natural history. 144 ILLINOIS NATURAL HISTORY SURVEY BULLETIN V"ol. 21, Art. 4 opening just below it; mesa! plates appearing slightly hooked dorsally. Holotype, male.—Oregon, Illinois: July 18, 1927, at light, T. H. Prison & R. D. Glasgow. Paratypes.—Illinois.—Algonquin: Sept. 5, 1904, Icf. Oregon: Same data as for holo- type, Id". Richmond: May 28, 19,S6, H. H. Ross, Id". Hydropsyche valanis new species Similar in size of body and eyes to aerata but differs in its deeper brown color, its rounded ninth and tenth. cal, narrowing slightly at apex;
. Bulletin. Natural history; Natural history. 144 ILLINOIS NATURAL HISTORY SURVEY BULLETIN V"ol. 21, Art. 4 opening just below it; mesa! plates appearing slightly hooked dorsally. Holotype, male.—Oregon, Illinois: July 18, 1927, at light, T. H. Prison & R. D. Glasgow. Paratypes.—Illinois.—Algonquin: Sept. 5, 1904, Icf. Oregon: Same data as for holo- type, Id". Richmond: May 28, 19,S6, H. H. Ross, Id". Hydropsyche valanis new species Similar in size of body and eyes to aerata but differs in its deeper brown color, its rounded ninth and tenth. cal, narrowing slightly at apex; apical portion flattened dorso-ventrally, the lateral processes meeting on the meson at tip and leaving only a small hole between them. Holotype, male.—Rockton, Illinois: July 2, 1931, along Rock River, Prison, Betten & Ross. Paratypes.—Illinois.— Kankakee: July 21, 1935, Ross & Mohr, Id". Rock Island: June 23, 1928, Prison & Hottes, Id". Rockton: Same data as for holotype, Tcf. Indiana.—Peru: May 18, 1936, at light. Prison & Ross, Id'. Iowa.—Ottumwa: Aug. 2, 1936, H. H Ross, 1 d'. Wisconsin.—Merrill: July 1, 1933, along Wisconsin River, Prison & Mohr, Id". Hydropsyche aerata new species Closely allied to valanis but differs in the white and brown pattern of the wings and body, the narrower apex of the oedagus and the upturned tenth tergite. Fig. 70.—Hydropsyche valanis segments, more nearly flat apex of oedagus and other genital characters. Male.—Size and general structure similar to corniUa. Color tawny or cream, with irregular flecking of light brown over the entire surface of the wings. Antennae with diagonal black lines on the basal seven segments of the flagellum. Legs light tawny. Eyes large, as wide as the distance between them. Genitalia as in fig. 70. Ninth and tenth abdominal terga separated by a well-marked suture. Ninth tergite with median hump rounded at apex and with a line of four or five long setae below
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