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UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 885 
Contribution from the Bureau of Entomology 
L. O. HOWARD, Chief 
Tl 
Washington, D. C. 
December 11, 1920 
THE BLACK FLY OF CITRUS AND 
OTHER SUBTROPICAL PLANTS 
By 
HARRY F. DIETZ, Entomological Inspector, Bureau of Entomology, 
United States Department of Agriculture, and JAMES 
ZETEK, Entomologist, the Panama Canal 
CONTENTS 
Introductory . . . ' . 1 
The Scientific Name of the Insect and to 
Whom it should be Accredited . . . * 2 
Literature 3 
Origin and Distribution 3 
Spread of the Insect in the New World .\ 6 
Food Plants . . . . 14 
Injury 18 
Life History and Habits 22 
Eggs 29 
First Larval In star 31 
Second Larval Instar 32 
Third Larval Instar 33 
Fourth Instar, or Pupa 34 
Page 
Life History and Habits — Continued. 
Fifth Instar, Adult or Imago ... 36 
Technical Description 39 
Seasonal History 42 
Parthenogenesis 44 
Natural Factors that Tend to Control the 
Black Fly in the Canal Zone .... 44 
Natural Enemies 45 
Artificial Control 45 
Possibility of the Black Fly being Intro- 
duced into the United States and Fac- 
tors Influencing its Establishment Here 47 
Summary 52 
Literature Cited 53 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1920 
