LETTER OF SUBMITTAL. 
UNITED STATES DEPARTMENT OF AGRICULTURE, 
DIVISION OF ENTOMOLOGY, 
Washington, June 11, 1891. 
Str: I have the honor to submit for immediate publication this 
emergency bulletin, covering the main facts in the life-history of the 
Hop Plant-louse and the best remedies against its ravages. This has 
been drawn up at your instance, in view of the facts that the report for 
1888 is no longer to be had for distribution, and that urgent demands 
for information are being made of the Department. The insect is 
appearing in alarming numbers in the hop regions of New York the ~ 
present week; while the hop growers of Oregon and Washington are 
also greatly exercised about it the present season. 
tespectfully yours, 
C.. Vig iviicniye 
; Entomologist. 
Hon. J. M. RUSK, 
Secretury of Agriculture. 
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