TABLE OF CONTENTS TO REPORT IX. 43 



REPORT IX. 



[Published March, 1877. J 



Preface Ill 



Table of Contents V 



NOXIOUS INSECTS. 

 Currant and Gooseberry Worms 1 



There are several species haying different habits, 1 Three which may 

 be destroyed by similar methods,! Botanical details as to the Cur- 

 rant and Gooseberry, 2. 



The Gooseberry Span-worm 3 



Its natural history, 3 Most destructive gooseberry insect in. Missouri, 

 3 Generic nomenclature, 3 Characters of the moth, 4 Description, 

 of the egg, 4 Where the eggs are laid, 4 The insect single-brooded, 

 5 How it spreads, 5 A native species, 5 Its past history, 5 It pre- 

 fers the Gooseberry to the Currant, 6 The moth is closely imitated by 

 one which greatly differs structurally, 6 Parasites, 6 Remedies, 7 - 

 Other currant Span-worms, 7. 



The Imported Currant Worm 7 



Belongs to the " False-caterpillars ", 7 The different specific names it has 

 received, 7 An imported species, 8 Its introduction and spread, 8 

 Independently imported at several eastern points, 9 Its natural his- 

 tory, 9 How the eggs are laid, 10 Nature and habits of the Worm, 

 11 Characters of the parent flies, 12 Preventive measures, 13 Rem- 

 edies, 13 White hellebore the best, 13 How best used, 14, 15 The 

 worm is not poisonous, 16 Natural enemies, 17 It furnishes a forcible 

 example of Arreuotoky or the power of producing male offspring with- 

 out impregnation, 18 Results of Parthenogenesis in different insects, 18 

 - It also furnishes an interesting instance of Defuuctionation of special 

 parts, 19 The saw of the female imperfect, compared with others, 

 20 Evolutionary bearings of this fact, 21 Descriptive, 21 Varia- 

 tion in the antenna 1 and wing veins, 22. 



The Native Currant Worm 23 



Wherein it differs from the imported species, 23 Its habits, 24 Where 

 the eggs are laid, 25 How the winter is passed, 25 Its occurrence in 

 Missouri, 26 Remedies, 26 Descriptive, 26. 



The Strawberry Worm 27 



Also a False-caterpillar, 27 It lias a wide range, 27 How the eggs are 

 deposited, 28 Character and habits of the Worm, 28 Remedies, 28 

 Descriptive, 28. 



Abbot's White Pine Worm 29 



Destructive power of the insects of its genus iu Germany, 29 Evergreens 

 which it prefers, 30 Habits and characters of the Worm, 30 Variation 

 in the antenna 1 , 30 Characters of the perfect flies, 30, 31 How the 

 eggs ars laid, 31 Natural enemies, 31 Remedies, 32 Descriptive, 32. 



LeConte's Pine Worm 32 



A more general feeder than Abbot's species, 32 The close resemblance of 

 the Worms, 33 How they differ, 33 Descriptive, 33 Other species 

 of the genus, 34. 



The Colorado Potato-beetle 34 



Injury in the West in 1876,34 Spread of the insect during the year, 

 34, 35 Its great abundance on the Atlantic coast, 35 Rate at which 

 it traveled since 1859, 37 An average of 88 miles a year, 37 How it 



