. Bulletin. Natural history; Natural history. 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'. Wisconsi
. Bulletin. Natural history; Natural history. 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 it on each side; apical margin of segment emerginate on meson, forming a pair of lateral, angulate projections. Tenth tergite semimembranous, di- vided by a mesal incision into two wide lobes, each with scattered, short setae along its margin. Claspers sinuate, the apical segment slightly hooked at tip; the basal segment with scattered, short setae over its entire surface and in ad- dition an area near apex bearing many extremely long setae; apical segment covered with fine setae. Oedagus angled at base; middle portion cy
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