Bulletin No. 4.— New Series. 



U. S. DEPARTMENT OF AGRICULTURE. 



DIVISION OF ENTOMOLOGY. 



THE PRINCIPAL 



HOUSEHOLD INSECTS 



OF THE 



UNITED STATES. 



L. O. HOWARD AND C. L. MAREATT. 



WITH A CHAPTER ON 



INSECTS AFFECTING DRY VEGETABLE FOODS. 



F. II. CHITTENDEN. 



WASHINGTON: 



OOYEENMENT PRINTING OFFICE, 



189G. 



