U. S. DEPARTMENT OF AGRICULTURE. 
DIVISION OF ENTOMOLOGY. 
BIBLIOGRAPHY 
or 
THE MORE IMPORTANT CONTRIBUTIONS 
AMERICAN ECONOMIC 
PREPARED, BY AUTHORITY OF THE SECRETARY OF AGRICULTURE, 
BY 
SAMUEL HENSHAW. 
PART II. 
THE MORE IMPORTANT JOINT WRITINGS 
OF 
B. D. WALSH and C. V. RILEY. 
WASHINGTON: 
GOVERNJIENT PRINTING OFFICE. 
188 9. 
51 
