Author Institution: Department of Biological Sciences, Youngstown State University ; Biology Department, Thiel CollegeCaddisfly adults numbering 4,371 were collected by means of light traps at Watercress Marsh, Columbiana Co., Ohio, from June 1976 to October 1981. The marsh occupies a site of the Grand River lobe of the Wisconsin Glacier near its southernmost extent in Columbiana Co. The 69 species in the 10 families collected included 15 species of Limnephilidae and 4 new state records. Seasonal species diversity values were calculated
