Buu. U.S. B. F., 1917-18. PLATE XV. 
Upper left: Lake Pepin mucket, Lam/psilis ludteola (Lamarck), male. (See p. 29.) 
Upper right: Lake Pepin mucket, Lam psilis luteola (Lamarck ), female. (See p. 2y.) 
Lower left: Butterfly, Plagiola securis (ea). (See P. 30.) 
Lower right: Pocketbook, Lampsilis ventricosa (Barnes). (See Pp. 30.) 
