Isoperla burksi Frison, 1942

was reported from Maryland by Duffield & Nelson (1990) (Fig. 24). The author has not collected males of this species from western Maryland, although undetermined females that may refer to either I. burksi or I. orata Frison, 1942 have been found at two localities (Fig. 24). Males with extruded aedeagi or females with mature eggs are needed for positive determination.