1947] 
Hydroptilidce 
171 
it is present from early spring to September. The first 
definite record from North Dakota is recorded herein. 
Minnesota: 97 males, 161 females from all portions of 
the State, April to Sept. North Dakota: Valley City, 
Jnly 15, 1939 (D. G. Denning), 2 males, 1 female. 
Wahpeton, July 16, 1937 (D. G. Denning), 2 males, 14 
females. British Columbia: Cowichan Lake, August, 
1940 (C. P. Idyll), 3 males, 1 female. 
Ithytrichia clavata Morton 
This is the first record of the species from Minnesota, 
although it is known to have a wide range. Minnesota : 
Crookston, June 16, 1941 (D. G. Denning), 1 male, Hal- 
lock, light trap, Jnly 7, 1937 (D. G. Denning), 3 males. 
Ochrotrichia stylata (Ross) 
Previously known from the western part of Wyoming; 
these are the first records from the eastern portion of the 
state. Wyoming: Guernsey, N. Platte River, Sept. 6, 
1946 (D. G. Denning), 1 male. Near Wheatland, Blue 
Grass Creek, Aug. 22, 1946 (D. G. Denning), 5 males, 
7 females. 
Oxyethira serrata Ross 
This species has previously been recorded from Illi- 
nois, New York and Wisconsin by Ross. The following 
records extend its known distributions considerably. 
Minnesota: St. Paul, light trap, July 14, 1935 (A. A. 
Granovsky), 1 male. St. Paul, light trap, Aug., 1934 (A 
A. Granovsky), 5 males, 4 females. Cass Co., at light, 
June 17, 1937 (R. H. Nagel), 3 males, 4 females. Cass 
Lake, light trap, August 1-15, 1934 (A. A. Granovsky), 
1 male, 3 females. British Columbia: Cowichan Lake, 
August, 1940 (C. P. Idyll), 1 male. 
Oxyethira verna Ross 
Louisiana: Baton Rouge, April, 1947 (W. W. Wirth), 
12 males. 
Oxyethira obtatus n. sp. 
This species can be distinguished from other members 
of the genus by the apical semi-membranous processes of 
