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Historical review of published writings on plant-bugs injurious to cotton bolls. . 11 
General considerations 13 
Nature of injury by plant-bugs 13 
Amount of damage to cotton by plant-bugs 20 
Plant-bugs as disseminators of plant diseases 23 
The conchuela (Pentatoma ligata Say) 23 
History 23 
Distribution 24 
Food plants ' 25 
Description 25 
Life history 29 
Methods of study 29 
Adults 29 
Period between maturity of adults and beginning of egg laying. . . 29 
Reproduction 30 
Proportion of sexes 32 
Longevity 32 
Relation of temperature to activity of adults 35 
Eggs 35 
Period of incubation 35 
Proportion hatching in the laboratory 37 
Effect of low temperature on vitality 38 
Hatching 38 
Nymphs 39 
Duration of nymphal stages 39 
Length of life without food 40 
Molting 41 
Habits 41 
Nymphs 41 
Adults 43 
Fertilization 43 
Egg laying 43 
Feeding ! 44 
Gregariousness 4 7 
Flight 48 
Seasonal history 48 
Increase and decrease in numbers during the Beason 48 
Hibernation 
Destructivenesa 55 
Individual capabilities 
Reduction in yield of infested cotton fields 57 
Effect of plant-bug attack on quality and market value of lint 61 
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